Merge branch 'akpm' (patches from Andrew)

Merge patch-bomb from Andrew Morton:

 - inotify tweaks

 - some ocfs2 updates (many more are awaiting review)

 - various misc bits

 - kernel/watchdog.c updates

 - Some of mm.  I have a huge number of MM patches this time and quite a
   lot of it is quite difficult and much will be held over to next time.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (162 commits)
  selftests: vm: add tests for lock on fault
  mm: mlock: add mlock flags to enable VM_LOCKONFAULT usage
  mm: introduce VM_LOCKONFAULT
  mm: mlock: add new mlock system call
  mm: mlock: refactor mlock, munlock, and munlockall code
  kasan: always taint kernel on report
  mm, slub, kasan: enable user tracking by default with KASAN=y
  kasan: use IS_ALIGNED in memory_is_poisoned_8()
  kasan: Fix a type conversion error
  lib: test_kasan: add some testcases
  kasan: update reference to kasan prototype repo
  kasan: move KASAN_SANITIZE in arch/x86/boot/Makefile
  kasan: various fixes in documentation
  kasan: update log messages
  kasan: accurately determine the type of the bad access
  kasan: update reported bug types for kernel memory accesses
  kasan: update reported bug types for not user nor kernel memory accesses
  mm/kasan: prevent deadlock in kasan reporting
  mm/kasan: don't use kasan shadow pointer in generic functions
  mm/kasan: MODULE_VADDR is not available on all archs
  ...

Documentation/filesystems/proc.txt

@@ -175,6 +175,7 @@ read the file /proc/PID/status:
   VmLib:      1412 kB
   VmPTE:        20 kb
   VmSwap:        0 kB
+  HugetlbPages:          0 kB
   Threads:        1
   SigQ:   0/28578
   SigPnd: 0000000000000000
@@ -238,6 +239,7 @@ Table 1-2: Contents of the status files (as of 4.1)
  VmPTE                       size of page table entries
  VmPMD                       size of second level page tables
  VmSwap                      size of swap usage (the number of referred swapents)
+ HugetlbPages                size of hugetlb memory portions
  Threads                     number of threads
  SigQ                        number of signals queued/max. number for queue
  SigPnd                      bitmap of pending signals for the thread
@@ -424,12 +426,15 @@ Private_Clean:         0 kB
 Private_Dirty:         0 kB
 Referenced:          892 kB
 Anonymous:             0 kB
+AnonHugePages:         0 kB
+Shared_Hugetlb:        0 kB
+Private_Hugetlb:       0 kB
 Swap:                  0 kB
 SwapPss:               0 kB
 KernelPageSize:        4 kB
 MMUPageSize:           4 kB
-Locked:              374 kB
-VmFlags: rd ex mr mw me de
+Locked:                0 kB
+VmFlags: rd ex mr mw me dw
 
 the first of these lines shows the same information as is displayed for the
 mapping in /proc/PID/maps.  The remaining lines show the size of the mapping
@@ -449,9 +454,14 @@ accessed.
 "Anonymous" shows the amount of memory that does not belong to any file.  Even
 a mapping associated with a file may contain anonymous pages: when MAP_PRIVATE
 and a page is modified, the file page is replaced by a private anonymous copy.
-"Swap" shows how much would-be-anonymous memory is also used, but out on
-swap.
+"AnonHugePages" shows the ammount of memory backed by transparent hugepage.
+"Shared_Hugetlb" and "Private_Hugetlb" show the ammounts of memory backed by
+hugetlbfs page which is *not* counted in "RSS" or "PSS" field for historical
+reasons. And these are not included in {Shared,Private}_{Clean,Dirty} field.
+"Swap" shows how much would-be-anonymous memory is also used, but out on swap.
 "SwapPss" shows proportional swap share of this mapping.
+"Locked" indicates whether the mapping is locked in memory or not.
+
 "VmFlags" field deserves a separate description. This member represents the kernel
 flags associated with the particular virtual memory area in two letter encoded
 manner. The codes are the following:
@@ -475,7 +485,6 @@ manner. The codes are the following:
     ac  - area is accountable
     nr  - swap space is not reserved for the area
     ht  - area uses huge tlb pages
-    nl  - non-linear mapping
     ar  - architecture specific flag
     dd  - do not include area into core dump
     sd  - soft-dirty flag
@@ -815,9 +824,6 @@ varies by architecture and compile options.  The following is from a
 
 > cat /proc/meminfo
 
-The "Locked" indicates whether the mapping is locked in memory or not.
-
-
 MemTotal:     16344972 kB
 MemFree:      13634064 kB
 MemAvailable: 14836172 kB

Documentation/kasan.txt

@@ -1,36 +1,34 @@
-Kernel address sanitizer
-================
+KernelAddressSanitizer (KASAN)
+==============================
 
 0. Overview
 ===========
 
-Kernel Address sanitizer (KASan) is a dynamic memory error detector. It provides
+KernelAddressSANitizer (KASAN) is a dynamic memory error detector. It provides
 a fast and comprehensive solution for finding use-after-free and out-of-bounds
 bugs.
 
-KASan uses compile-time instrumentation for checking every memory access,
-therefore you will need a gcc version of 4.9.2 or later. KASan could detect out
-of bounds accesses to stack or global variables, but only if gcc 5.0 or later was
-used to built the kernel.
+KASAN uses compile-time instrumentation for checking every memory access,
+therefore you will need a GCC version 4.9.2 or later. GCC 5.0 or later is
+required for detection of out-of-bounds accesses to stack or global variables.
 
-Currently KASan is supported only for x86_64 architecture and requires that the
-kernel be built with the SLUB allocator.
+Currently KASAN is supported only for x86_64 architecture and requires the
+kernel to be built with the SLUB allocator.
 
 1. Usage
-=========
+========
 
 To enable KASAN configure kernel with:
 
 	  CONFIG_KASAN = y
 
-and choose between CONFIG_KASAN_OUTLINE and CONFIG_KASAN_INLINE. Outline/inline
-is compiler instrumentation types. The former produces smaller binary the
-latter is 1.1 - 2 times faster. Inline instrumentation requires a gcc version
-of 5.0 or later.
+and choose between CONFIG_KASAN_OUTLINE and CONFIG_KASAN_INLINE. Outline and
+inline are compiler instrumentation types. The former produces smaller binary
+the latter is 1.1 - 2 times faster. Inline instrumentation requires a GCC
+version 5.0 or later.
 
 Currently KASAN works only with the SLUB memory allocator.
-For better bug detection and nicer report, enable CONFIG_STACKTRACE and put
-at least 'slub_debug=U' in the boot cmdline.
+For better bug detection and nicer reporting, enable CONFIG_STACKTRACE.
 
 To disable instrumentation for specific files or directories, add a line
 similar to the following to the respective kernel Makefile:
@@ -42,7 +40,7 @@ similar to the following to the respective kernel Makefile:
                 KASAN_SANITIZE := n
 
 1.1 Error reports
-==========
+=================
 
 A typical out of bounds access report looks like this:
 
@@ -119,14 +117,16 @@ Memory state around the buggy address:
  ffff8800693bc800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ==================================================================
 
-First sections describe slub object where bad access happened.
-See 'SLUB Debug output' section in Documentation/vm/slub.txt for details.
+The header of the report discribe what kind of bug happened and what kind of
+access caused it. It's followed by the description of the accessed slub object
+(see 'SLUB Debug output' section in Documentation/vm/slub.txt for details) and
+the description of the accessed memory page.
 
 In the last section the report shows memory state around the accessed address.
-Reading this part requires some more understanding of how KASAN works.
+Reading this part requires some understanding of how KASAN works.
 
-Each 8 bytes of memory are encoded in one shadow byte as accessible,
-partially accessible, freed or they can be part of a redzone.
+The state of each 8 aligned bytes of memory is encoded in one shadow byte.
+Those 8 bytes can be accessible, partially accessible, freed or be a redzone.
 We use the following encoding for each shadow byte: 0 means that all 8 bytes
 of the corresponding memory region are accessible; number N (1 <= N <= 7) means
 that the first N bytes are accessible, and other (8 - N) bytes are not;
@@ -139,7 +139,7 @@ the accessed address is partially accessible.
 
 
 2. Implementation details
-========================
+=========================
 
 From a high level, our approach to memory error detection is similar to that
 of kmemcheck: use shadow memory to record whether each byte of memory is safe

Documentation/kernel-parameters.txt

@@ -1275,6 +1275,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			Format: <unsigned int> such that (rxsize & ~0x1fffc0) == 0.
 			Default: 1024
 
+	hardlockup_all_cpu_backtrace=
+			[KNL] Should the hard-lockup detector generate
+			backtraces on all cpus.
+			Format: <integer>
+
 	hashdist=	[KNL,NUMA] Large hashes allocated during boot
 			are distributed across NUMA nodes.  Defaults on
 			for 64-bit NUMA, off otherwise.

Documentation/lockup-watchdogs.txt

@@ -20,8 +20,9 @@ kernel mode for more than 10 seconds (see "Implementation" below for
 details), without letting other interrupts have a chance to run.
 Similarly to the softlockup case, the current stack trace is displayed
 upon detection and the system will stay locked up unless the default
-behavior is changed, which can be done through a compile time knob,
-"BOOTPARAM_HARDLOCKUP_PANIC", and a kernel parameter, "nmi_watchdog"
+behavior is changed, which can be done through a sysctl,
+'hardlockup_panic', a compile time knob, "BOOTPARAM_HARDLOCKUP_PANIC",
+and a kernel parameter, "nmi_watchdog"
 (see "Documentation/kernel-parameters.txt" for details).
 
 The panic option can be used in combination with panic_timeout (this

Documentation/sysctl/kernel.txt

@@ -33,6 +33,7 @@ show up in /proc/sys/kernel:
 - domainname
 - hostname
 - hotplug
+- hardlockup_all_cpu_backtrace
 - hung_task_panic
 - hung_task_check_count
 - hung_task_timeout_secs
@@ -292,6 +293,17 @@ Information Service) or YP (Yellow Pages) domainname. These two
 domain names are in general different. For a detailed discussion
 see the hostname(1) man page.
 
+==============================================================
+hardlockup_all_cpu_backtrace:
+
+This value controls the hard lockup detector behavior when a hard
+lockup condition is detected as to whether or not to gather further
+debug information. If enabled, arch-specific all-CPU stack dumping
+will be initiated.
+
+0: do nothing. This is the default behavior.
+
+1: on detection capture more debug information.
 ==============================================================
 
 hotplug:

Documentation/vm/page_migration

@@ -92,29 +92,26 @@ Steps:
 
 2. Insure that writeback is complete.
 
-3. Prep the new page that we want to move to. It is locked
-   and set to not being uptodate so that all accesses to the new
-   page immediately lock while the move is in progress.
+3. Lock the new page that we want to move to. It is locked so that accesses to
+   this (not yet uptodate) page immediately lock while the move is in progress.
 
-4. The new page is prepped with some settings from the old page so that
-   accesses to the new page will discover a page with the correct settings.
-
-5. All the page table references to the page are converted
-   to migration entries or dropped (nonlinear vmas).
-   This decrease the mapcount of a page. If the resulting
-   mapcount is not zero then we do not migrate the page.
-   All user space processes that attempt to access the page
-   will now wait on the page lock.
+4. All the page table references to the page are converted to migration
+   entries. This decreases the mapcount of a page. If the resulting
+   mapcount is not zero then we do not migrate the page. All user space
+   processes that attempt to access the page will now wait on the page lock.
 
-6. The radix tree lock is taken. This will cause all processes trying
+5. The radix tree lock is taken. This will cause all processes trying
    to access the page via the mapping to block on the radix tree spinlock.
 
-7. The refcount of the page is examined and we back out if references remain
+6. The refcount of the page is examined and we back out if references remain
    otherwise we know that we are the only one referencing this page.
 
-8. The radix tree is checked and if it does not contain the pointer to this
+7. The radix tree is checked and if it does not contain the pointer to this
    page then we back out because someone else modified the radix tree.
 
+8. The new page is prepped with some settings from the old page so that
+   accesses to the new page will discover a page with the correct settings.
+
 9. The radix tree is changed to point to the new page.
 
 10. The reference count of the old page is dropped because the radix tree

Documentation/vm/transhuge.txt

@@ -170,6 +170,16 @@ A lower value leads to gain less thp performance. Value of
 max_ptes_none can waste cpu time very little, you can
 ignore it.
 
+max_ptes_swap specifies how many pages can be brought in from
+swap when collapsing a group of pages into a transparent huge page.
+
+/sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_swap
+
+A higher value can cause excessive swap IO and waste
+memory. A lower value can prevent THPs from being
+collapsed, resulting fewer pages being collapsed into
+THPs, and lower memory access performance.
+
 == Boot parameter ==
 
 You can change the sysfs boot time defaults of Transparent Hugepage

Documentation/vm/unevictable-lru.txt

@@ -531,83 +531,20 @@ map.
 
 try_to_unmap() is always called, by either vmscan for reclaim or for page
 migration, with the argument page locked and isolated from the LRU.  Separate
-functions handle anonymous and mapped file pages, as these types of pages have
-different reverse map mechanisms.
-
- (*) try_to_unmap_anon()
-
-     To unmap anonymous pages, each VMA in the list anchored in the anon_vma
-     must be visited - at least until a VM_LOCKED VMA is encountered.  If the
-     page is being unmapped for migration, VM_LOCKED VMAs do not stop the
-     process because mlocked pages are migratable.  However, for reclaim, if
-     the page is mapped into a VM_LOCKED VMA, the scan stops.
-
-     try_to_unmap_anon() attempts to acquire in read mode the mmap semaphore of
-     the mm_struct to which the VMA belongs.  If this is successful, it will
-     mlock the page via mlock_vma_page() - we wouldn't have gotten to
-     try_to_unmap_anon() if the page were already mlocked - and will return
-     SWAP_MLOCK, indicating that the page is unevictable.
-
-     If the mmap semaphore cannot be acquired, we are not sure whether the page
-     is really unevictable or not.  In this case, try_to_unmap_anon() will
-     return SWAP_AGAIN.
-
- (*) try_to_unmap_file() - linear mappings
-
-     Unmapping of a mapped file page works the same as for anonymous mappings,
-     except that the scan visits all VMAs that map the page's index/page offset
-     in the page's mapping's reverse map priority search tree.  It also visits
-     each VMA in the page's mapping's non-linear list, if the list is
-     non-empty.
-
-     As for anonymous pages, on encountering a VM_LOCKED VMA for a mapped file
-     page, try_to_unmap_file() will attempt to acquire the associated
-     mm_struct's mmap semaphore to mlock the page, returning SWAP_MLOCK if this
-     is successful, and SWAP_AGAIN, if not.
-
- (*) try_to_unmap_file() - non-linear mappings
-
-     If a page's mapping contains a non-empty non-linear mapping VMA list, then
-     try_to_un{map|lock}() must also visit each VMA in that list to determine
-     whether the page is mapped in a VM_LOCKED VMA.  Again, the scan must visit
-     all VMAs in the non-linear list to ensure that the pages is not/should not
-     be mlocked.
-
-     If a VM_LOCKED VMA is found in the list, the scan could terminate.
-     However, there is no easy way to determine whether the page is actually
-     mapped in a given VMA - either for unmapping or testing whether the
-     VM_LOCKED VMA actually pins the page.
-
-     try_to_unmap_file() handles non-linear mappings by scanning a certain
-     number of pages - a "cluster" - in each non-linear VMA associated with the
-     page's mapping, for each file mapped page that vmscan tries to unmap.  If
-     this happens to unmap the page we're trying to unmap, try_to_unmap() will
-     notice this on return (page_mapcount(page) will be 0) and return
-     SWAP_SUCCESS.  Otherwise, it will return SWAP_AGAIN, causing vmscan to
-     recirculate this page.  We take advantage of the cluster scan in
-     try_to_unmap_cluster() as follows:
-
-	For each non-linear VMA, try_to_unmap_cluster() attempts to acquire the
-	mmap semaphore of the associated mm_struct for read without blocking.
-
-	If this attempt is successful and the VMA is VM_LOCKED,
-	try_to_unmap_cluster() will retain the mmap semaphore for the scan;
-	otherwise it drops it here.
-
-	Then, for each page in the cluster, if we're holding the mmap semaphore
-	for a locked VMA, try_to_unmap_cluster() calls mlock_vma_page() to
-	mlock the page.  This call is a no-op if the page is already locked,
-	but will mlock any pages in the non-linear mapping that happen to be
-	unlocked.
-
-	If one of the pages so mlocked is the page passed in to try_to_unmap(),
-	try_to_unmap_cluster() will return SWAP_MLOCK, rather than the default
-	SWAP_AGAIN.  This will allow vmscan to cull the page, rather than
-	recirculating it on the inactive list.
-
-	Again, if try_to_unmap_cluster() cannot acquire the VMA's mmap sem, it
-	returns SWAP_AGAIN, indicating that the page is mapped by a VM_LOCKED
-	VMA, but couldn't be mlocked.
+functions handle anonymous and mapped file and KSM pages, as these types of
+pages have different reverse map lookup mechanisms, with different locking.
+In each case, whether rmap_walk_anon() or rmap_walk_file() or rmap_walk_ksm(),
+it will call try_to_unmap_one() for every VMA which might contain the page.
+
+When trying to reclaim, if try_to_unmap_one() finds the page in a VM_LOCKED
+VMA, it will then mlock the page via mlock_vma_page() instead of unmapping it,
+and return SWAP_MLOCK to indicate that the page is unevictable: and the scan
+stops there.
+
+mlock_vma_page() is called while holding the page table's lock (in addition
+to the page lock, and the rmap lock): to serialize against concurrent mlock or
+munlock or munmap system calls, mm teardown (munlock_vma_pages_all), reclaim,
+holepunching, and truncation of file pages and their anonymous COWed pages.
 
 
 try_to_munlock() REVERSE MAP SCAN
@@ -623,29 +560,15 @@ all PTEs from the page.  For this purpose, the unevictable/mlock infrastructure
 introduced a variant of try_to_unmap() called try_to_munlock().
 
 try_to_munlock() calls the same functions as try_to_unmap() for anonymous and
-mapped file pages with an additional argument specifying unlock versus unmap
+mapped file and KSM pages with a flag argument specifying unlock versus unmap
 processing.  Again, these functions walk the respective reverse maps looking
-for VM_LOCKED VMAs.  When such a VMA is found for anonymous pages and file
-pages mapped in linear VMAs, as in the try_to_unmap() case, the functions
-attempt to acquire the associated mmap semaphore, mlock the page via
-mlock_vma_page() and return SWAP_MLOCK.  This effectively undoes the
-pre-clearing of the page's PG_mlocked done by munlock_vma_page.
-
-If try_to_unmap() is unable to acquire a VM_LOCKED VMA's associated mmap
-semaphore, it will return SWAP_AGAIN.  This will allow shrink_page_list() to
-recycle the page on the inactive list and hope that it has better luck with the
-page next time.
-
-For file pages mapped into non-linear VMAs, the try_to_munlock() logic works
-slightly differently.  On encountering a VM_LOCKED non-linear VMA that might
-map the page, try_to_munlock() returns SWAP_AGAIN without actually mlocking the
-page.  munlock_vma_page() will just leave the page unlocked and let vmscan deal
-with it - the usual fallback position.
+for VM_LOCKED VMAs.  When such a VMA is found, as in the try_to_unmap() case,
+the functions mlock the page via mlock_vma_page() and return SWAP_MLOCK.  This
+undoes the pre-clearing of the page's PG_mlocked done by munlock_vma_page.
 
 Note that try_to_munlock()'s reverse map walk must visit every VMA in a page's
 reverse map to determine that a page is NOT mapped into any VM_LOCKED VMA.
-However, the scan can terminate when it encounters a VM_LOCKED VMA and can
-successfully acquire the VMA's mmap semaphore for read and mlock the page.
+However, the scan can terminate when it encounters a VM_LOCKED VMA.
 Although try_to_munlock() might be called a great many times when munlocking a
 large region or tearing down a large address space that has been mlocked via
 mlockall(), overall this is a fairly rare event.
@@ -673,11 +596,6 @@ Some examples of these unevictable pages on the LRU lists are:
  (3) mlocked pages that could not be isolated from the LRU and moved to the
      unevictable list in mlock_vma_page().
 
- (4) Pages mapped into multiple VM_LOCKED VMAs, but try_to_munlock() couldn't
-     acquire the VMA's mmap semaphore to test the flags and set PageMlocked.
-     munlock_vma_page() was forced to let the page back on to the normal LRU
-     list for vmscan to handle.
-
 shrink_inactive_list() also diverts any unevictable pages that it finds on the
 inactive lists to the appropriate zone's unevictable list.
 

arch/alpha/include/uapi/asm/mman.h

@@ -37,6 +37,9 @@
 
 #define MCL_CURRENT	 8192		/* lock all currently mapped pages */
 #define MCL_FUTURE	16384		/* lock all additions to address space */
+#define MCL_ONFAULT	32768		/* lock all pages that are faulted in */
+
+#define MLOCK_ONFAULT	0x01		/* Lock pages in range after they are faulted in, do not prefault */
 
 #define MADV_NORMAL	0		/* no further special treatment */
 #define MADV_RANDOM	1		/* expect random page references */

arch/arm/mm/alignment.c

@@ -803,7 +803,7 @@ do_alignment(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 			}
 		}
 	} else {
-		fault = probe_kernel_address(instrptr, instr);
+		fault = probe_kernel_address((void *)instrptr, instr);
 		instr = __mem_to_opcode_arm(instr);
 	}
 

arch/mips/include/uapi/asm/mman.h

@@ -61,6 +61,12 @@
  */
 #define MCL_CURRENT	1		/* lock all current mappings */
 #define MCL_FUTURE	2		/* lock all future mappings */
+#define MCL_ONFAULT	4		/* lock all pages that are faulted in */
+
+/*
+ * Flags for mlock
+ */
+#define MLOCK_ONFAULT	0x01		/* Lock pages in range after they are faulted in, do not prefault */
 
 #define MADV_NORMAL	0		/* no further special treatment */
 #define MADV_RANDOM	1		/* expect random page references */

arch/parisc/include/uapi/asm/mman.h

@@ -31,6 +31,9 @@
 
 #define MCL_CURRENT	1		/* lock all current mappings */
 #define MCL_FUTURE	2		/* lock all future mappings */
+#define MCL_ONFAULT	4		/* lock all pages that are faulted in */
+
+#define MLOCK_ONFAULT	0x01		/* Lock pages in range after they are faulted in, do not prefault */
 
 #define MADV_NORMAL     0               /* no further special treatment */
 #define MADV_RANDOM     1               /* expect random page references */

arch/powerpc/include/uapi/asm/mman.h

@@ -22,6 +22,7 @@
 
 #define MCL_CURRENT     0x2000          /* lock all currently mapped pages */
 #define MCL_FUTURE      0x4000          /* lock all additions to address space */
+#define MCL_ONFAULT	0x8000		/* lock all pages that are faulted in */
 
 #define MAP_POPULATE	0x8000		/* populate (prefault) pagetables */
 #define MAP_NONBLOCK	0x10000		/* do not block on IO */

arch/powerpc/mm/numa.c

@@ -80,7 +80,7 @@ static void __init setup_node_to_cpumask_map(void)
 		setup_nr_node_ids();
 
 	/* allocate the map */
-	for (node = 0; node < nr_node_ids; node++)
+	for_each_node(node)
 		alloc_bootmem_cpumask_var(&node_to_cpumask_map[node]);
 
 	/* cpumask_of_node() will now work */

arch/powerpc/sysdev/fsl_pci.c

@@ -999,7 +999,7 @@ int fsl_pci_mcheck_exception(struct pt_regs *regs)
 			ret = get_user(regs->nip, &inst);
 			pagefault_enable();
 		} else {
-			ret = probe_kernel_address(regs->nip, inst);
+			ret = probe_kernel_address((void *)regs->nip, inst);
 		}
 
 		if (mcheck_handle_load(regs, inst)) {

arch/sparc/include/uapi/asm/mman.h

@@ -17,6 +17,7 @@
 
 #define MCL_CURRENT     0x2000          /* lock all currently mapped pages */
 #define MCL_FUTURE      0x4000          /* lock all additions to address space */
+#define MCL_ONFAULT	0x8000		/* lock all pages that are faulted in */
 
 #define MAP_POPULATE	0x8000		/* populate (prefault) pagetables */
 #define MAP_NONBLOCK	0x10000		/* do not block on IO */

arch/tile/include/uapi/asm/mman.h

@@ -36,6 +36,7 @@
  */
 #define MCL_CURRENT	1		/* lock all current mappings */
 #define MCL_FUTURE	2		/* lock all future mappings */
+#define MCL_ONFAULT	4		/* lock all pages that are faulted in */
 
 
 #endif /* _ASM_TILE_MMAN_H */

arch/x86/boot/Makefile

@@ -9,13 +9,13 @@
 # Changed by many, many contributors over the years.
 #
 
+KASAN_SANITIZE := n
+
 # If you want to preset the SVGA mode, uncomment the next line and
 # set SVGA_MODE to whatever number you want.
 # Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode.
 # The number is the same as you would ordinarily press at bootup.
 
-KASAN_SANITIZE := n
-
 SVGA_MODE	:= -DSVGA_MODE=NORMAL_VGA
 
 targets		:= vmlinux.bin setup.bin setup.elf bzImage

arch/x86/entry/syscalls/syscall_32.tbl

@@ -382,3 +382,4 @@
 373	i386	shutdown		sys_shutdown
 374	i386	userfaultfd		sys_userfaultfd
 375	i386	membarrier		sys_membarrier
+376	i386	mlock2			sys_mlock2

arch/x86/entry/syscalls/syscall_64.tbl

@@ -331,6 +331,7 @@
 322	64	execveat		stub_execveat
 323	common	userfaultfd		sys_userfaultfd
 324	common	membarrier		sys_membarrier
+325	common	mlock2			sys_mlock2
 
 #
 # x32-specific system call numbers start at 512 to avoid cache impact

arch/x86/mm/kasan_init_64.c

@@ -126,5 +126,5 @@ void __init kasan_init(void)
 	__flush_tlb_all();
 	init_task.kasan_depth = 0;
 
-	pr_info("Kernel address sanitizer initialized\n");
+	pr_info("KernelAddressSanitizer initialized\n");
 }

arch/xtensa/include/uapi/asm/mman.h

@@ -74,6 +74,12 @@
  */
 #define MCL_CURRENT	1		/* lock all current mappings */
 #define MCL_FUTURE	2		/* lock all future mappings */
+#define MCL_ONFAULT	4		/* lock all pages that are faulted in */
+
+/*
+ * Flags for mlock
+ */
+#define MLOCK_ONFAULT	0x01		/* Lock pages in range after they are faulted in, do not prefault */
 
 #define MADV_NORMAL	0		/* no further special treatment */
 #define MADV_RANDOM	1		/* expect random page references */

fs/9p/vfs_file.c

@@ -231,7 +231,8 @@ out_unlock:
 	if (res < 0 && fl->fl_type != F_UNLCK) {
 		fl_type = fl->fl_type;
 		fl->fl_type = F_UNLCK;
-		res = locks_lock_file_wait(filp, fl);
+		/* Even if this fails we want to return the remote error */
+		locks_lock_file_wait(filp, fl);
 		fl->fl_type = fl_type;
 	}
 out:

fs/fs-writeback.c

@@ -2149,7 +2149,12 @@ static void wait_sb_inodes(struct super_block *sb)
 		iput(old_inode);
 		old_inode = inode;
 
-		filemap_fdatawait(mapping);
+		/*
+		 * We keep the error status of individual mapping so that
+		 * applications can catch the writeback error using fsync(2).
+		 * See filemap_fdatawait_keep_errors() for details.
+		 */
+		filemap_fdatawait_keep_errors(mapping);
 
 		cond_resched();
 

fs/logfs/dev_bdev.c

@@ -81,7 +81,7 @@ static int __bdev_writeseg(struct super_block *sb, u64 ofs, pgoff_t index,
 	unsigned int max_pages;
 	int i;
 
-	max_pages = min(nr_pages, BIO_MAX_PAGES);
+	max_pages = min_t(size_t, nr_pages, BIO_MAX_PAGES);
 
 	bio = bio_alloc(GFP_NOFS, max_pages);
 	BUG_ON(!bio);
@@ -171,7 +171,7 @@ static int do_erase(struct super_block *sb, u64 ofs, pgoff_t index,
 	unsigned int max_pages;
 	int i;
 
-	max_pages = min(nr_pages, BIO_MAX_PAGES);
+	max_pages = min_t(size_t, nr_pages, BIO_MAX_PAGES);
 
 	bio = bio_alloc(GFP_NOFS, max_pages);
 	BUG_ON(!bio);

fs/notify/fdinfo.c

@@ -83,9 +83,16 @@ static void inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
 	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
 	inode = igrab(mark->inode);
 	if (inode) {
+		/*
+		 * IN_ALL_EVENTS represents all of the mask bits
+		 * that we expose to userspace.  There is at
+		 * least one bit (FS_EVENT_ON_CHILD) which is
+		 * used only internally to the kernel.
+		 */
+		u32 mask = mark->mask & IN_ALL_EVENTS;
 		seq_printf(m, "inotify wd:%x ino:%lx sdev:%x mask:%x ignored_mask:%x ",
 			   inode_mark->wd, inode->i_ino, inode->i_sb->s_dev,
-			   mark->mask, mark->ignored_mask);
+			   mask, mark->ignored_mask);
 		show_mark_fhandle(m, inode);
 		seq_putc(m, '\n');
 		iput(inode);

fs/notify/inotify/inotify_user.c

@@ -706,7 +706,19 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname,
 	int ret;
 	unsigned flags = 0;
 
-	/* don't allow invalid bits: we don't want flags set */
+	/*
+	 * We share a lot of code with fs/dnotify.  We also share
+	 * the bit layout between inotify's IN_* and the fsnotify
+	 * FS_*.  This check ensures that only the inotify IN_*
+	 * bits get passed in and set in watches/events.
+	 */
+	if (unlikely(mask & ~ALL_INOTIFY_BITS))
+		return -EINVAL;
+	/*
+	 * Require at least one valid bit set in the mask.
+	 * Without _something_ set, we would have no events to
+	 * watch for.
+	 */
 	if (unlikely(!(mask & ALL_INOTIFY_BITS)))
 		return -EINVAL;
 

fs/ocfs2/aops.c

@@ -589,6 +589,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
 			ret = -EIO;
 			goto bail;
 		}
+		set_buffer_new(bh_result);
 		up_write(&OCFS2_I(inode)->ip_alloc_sem);
 	}
 
@@ -864,6 +865,7 @@ static ssize_t ocfs2_direct_IO_write(struct kiocb *iocb,
 		is_overwrite = ocfs2_is_overwrite(osb, inode, offset);
 		if (is_overwrite < 0) {
 			mlog_errno(is_overwrite);
+			ret = is_overwrite;
 			ocfs2_inode_unlock(inode, 1);
 			goto clean_orphan;
 		}

fs/ocfs2/cluster/heartbeat.c

@@ -219,7 +219,8 @@ struct o2hb_region {
 	unsigned		hr_unclean_stop:1,
 				hr_aborted_start:1,
 				hr_item_pinned:1,
-				hr_item_dropped:1;
+				hr_item_dropped:1,
+				hr_node_deleted:1;
 
 	/* protected by the hr_callback_sem */
 	struct task_struct 	*hr_task;
@@ -1078,7 +1079,13 @@ static int o2hb_thread(void *data)
 	set_user_nice(current, MIN_NICE);
 
 	/* Pin node */
-	o2nm_depend_this_node();
+	ret = o2nm_depend_this_node();
+	if (ret) {
+		mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret);
+		reg->hr_node_deleted = 1;
+		wake_up(&o2hb_steady_queue);
+		return 0;
+	}
 
 	while (!kthread_should_stop() &&
 	       !reg->hr_unclean_stop && !reg->hr_aborted_start) {
@@ -1787,7 +1794,8 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
 	spin_unlock(&o2hb_live_lock);
 
 	ret = wait_event_interruptible(o2hb_steady_queue,
-				atomic_read(&reg->hr_steady_iterations) == 0);
+				atomic_read(&reg->hr_steady_iterations) == 0 ||
+				reg->hr_node_deleted);
 	if (ret) {
 		atomic_set(&reg->hr_steady_iterations, 0);
 		reg->hr_aborted_start = 1;
@@ -1798,6 +1806,11 @@ static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
 		goto out3;
 	}
 
+	if (reg->hr_node_deleted) {
+		ret = -EINVAL;
+		goto out3;
+	}
+
 	/* Ok, we were woken.  Make sure it wasn't by drop_item() */
 	spin_lock(&o2hb_live_lock);
 	hb_task = reg->hr_task;

fs/ocfs2/dlm/dlmdomain.c

@@ -1866,6 +1866,7 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
 	int status;
 	unsigned int backoff;
 	unsigned int total_backoff = 0;
+	char wq_name[O2NM_MAX_NAME_LEN];
 
 	BUG_ON(!dlm);
 
@@ -1895,7 +1896,8 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
 		goto bail;
 	}
 
-	dlm->dlm_worker = create_singlethread_workqueue("dlm_wq");
+	snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
+	dlm->dlm_worker = create_singlethread_workqueue(wq_name);
 	if (!dlm->dlm_worker) {
 		status = -ENOMEM;
 		mlog_errno(status);

fs/ocfs2/dlm/dlmrecovery.c

@@ -205,7 +205,7 @@ int dlm_launch_recovery_thread(struct dlm_ctxt *dlm)
 	mlog(0, "starting dlm recovery thread...\n");
 
 	dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm,
-						"dlm_reco_thread");
+			"dlm_reco-%s", dlm->name);
 	if (IS_ERR(dlm->dlm_reco_thread_task)) {
 		mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task));
 		dlm->dlm_reco_thread_task = NULL;

fs/ocfs2/dlm/dlmthread.c

@@ -493,7 +493,8 @@ int dlm_launch_thread(struct dlm_ctxt *dlm)
 {
 	mlog(0, "Starting dlm_thread...\n");
 
-	dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm_thread");
+	dlm->dlm_thread_task = kthread_run(dlm_thread, dlm, "dlm-%s",
+			dlm->name);
 	if (IS_ERR(dlm->dlm_thread_task)) {
 		mlog_errno(PTR_ERR(dlm->dlm_thread_task));
 		dlm->dlm_thread_task = NULL;

fs/ocfs2/dlmglue.c

@@ -2998,7 +2998,8 @@ int ocfs2_dlm_init(struct ocfs2_super *osb)
 	}
 
 	/* launch downconvert thread */
-	osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc");
+	osb->dc_task = kthread_run(ocfs2_downconvert_thread, osb, "ocfs2dc-%s",
+			osb->uuid_str);
 	if (IS_ERR(osb->dc_task)) {
 		status = PTR_ERR(osb->dc_task);
 		osb->dc_task = NULL;

fs/ocfs2/inode.h

@@ -112,6 +112,8 @@ struct ocfs2_inode_info
 #define OCFS2_INODE_OPEN_DIRECT		0x00000020
 /* Tell the inode wipe code it's not in orphan dir */
 #define OCFS2_INODE_SKIP_ORPHAN_DIR     0x00000040
+/* Entry in orphan dir with 'dio-' prefix */
+#define OCFS2_INODE_DIO_ORPHAN_ENTRY	0x00000080
 
 static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
 {

fs/ocfs2/journal.c

@@ -1090,7 +1090,7 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed)
 	/* Launch the commit thread */
 	if (!local) {
 		osb->commit_task = kthread_run(ocfs2_commit_thread, osb,
-					       "ocfs2cmt");
+				"ocfs2cmt-%s", osb->uuid_str);
 		if (IS_ERR(osb->commit_task)) {
 			status = PTR_ERR(osb->commit_task);
 			osb->commit_task = NULL;
@@ -1507,7 +1507,7 @@ void ocfs2_recovery_thread(struct ocfs2_super *osb, int node_num)
 		goto out;
 
 	osb->recovery_thread_task =  kthread_run(__ocfs2_recovery_thread, osb,
-						 "ocfs2rec");
+			"ocfs2rec-%s", osb->uuid_str);
 	if (IS_ERR(osb->recovery_thread_task)) {
 		mlog_errno((int)PTR_ERR(osb->recovery_thread_task));
 		osb->recovery_thread_task = NULL;
@@ -2021,6 +2021,7 @@ struct ocfs2_orphan_filldir_priv {
 	struct dir_context	ctx;
 	struct inode		*head;
 	struct ocfs2_super	*osb;
+	enum ocfs2_orphan_reco_type orphan_reco_type;
 };
 
 static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
@@ -2036,12 +2037,22 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
 	if (name_len == 2 && !strncmp("..", name, 2))
 		return 0;
 
+	/* do not include dio entry in case of orphan scan */
+	if ((p->orphan_reco_type == ORPHAN_NO_NEED_TRUNCATE) &&
+			(!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
+			OCFS2_DIO_ORPHAN_PREFIX_LEN)))
+		return 0;
+
 	/* Skip bad inodes so that recovery can continue */
 	iter = ocfs2_iget(p->osb, ino,
 			  OCFS2_FI_FLAG_ORPHAN_RECOVERY, 0);
 	if (IS_ERR(iter))
 		return 0;
 
+	if (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
+			OCFS2_DIO_ORPHAN_PREFIX_LEN))
+		OCFS2_I(iter)->ip_flags |= OCFS2_INODE_DIO_ORPHAN_ENTRY;
+
 	/* Skip inodes which are already added to recover list, since dio may
 	 * happen concurrently with unlink/rename */
 	if (OCFS2_I(iter)->ip_next_orphan) {
@@ -2060,14 +2071,16 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
 
 static int ocfs2_queue_orphans(struct ocfs2_super *osb,
 			       int slot,
-			       struct inode **head)
+			       struct inode **head,
+			       enum ocfs2_orphan_reco_type orphan_reco_type)
 {
 	int status;
 	struct inode *orphan_dir_inode = NULL;
 	struct ocfs2_orphan_filldir_priv priv = {
 		.ctx.actor = ocfs2_orphan_filldir,
 		.osb = osb,
-		.head = *head
+		.head = *head,
+		.orphan_reco_type = orphan_reco_type
 	};
 
 	orphan_dir_inode = ocfs2_get_system_file_inode(osb,
@@ -2170,7 +2183,7 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 	trace_ocfs2_recover_orphans(slot);
 
 	ocfs2_mark_recovering_orphan_dir(osb, slot);
-	ret = ocfs2_queue_orphans(osb, slot, &inode);
+	ret = ocfs2_queue_orphans(osb, slot, &inode, orphan_reco_type);
 	ocfs2_clear_recovering_orphan_dir(osb, slot);
 
 	/* Error here should be noted, but we want to continue with as
@@ -2186,25 +2199,51 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 		iter = oi->ip_next_orphan;
 		oi->ip_next_orphan = NULL;
 
-		mutex_lock(&inode->i_mutex);
-		ret = ocfs2_rw_lock(inode, 1);
-		if (ret < 0) {
-			mlog_errno(ret);
-			goto next;
-		}
-		/*
-		 * We need to take and drop the inode lock to
-		 * force read inode from disk.
-		 */
-		ret = ocfs2_inode_lock(inode, &di_bh, 1);
-		if (ret) {
-			mlog_errno(ret);
-			goto unlock_rw;
-		}
+		if (oi->ip_flags & OCFS2_INODE_DIO_ORPHAN_ENTRY) {
+			mutex_lock(&inode->i_mutex);
+			ret = ocfs2_rw_lock(inode, 1);
+			if (ret < 0) {
+				mlog_errno(ret);
+				goto unlock_mutex;
+			}
+			/*
+			 * We need to take and drop the inode lock to
+			 * force read inode from disk.
+			 */
+			ret = ocfs2_inode_lock(inode, &di_bh, 1);
+			if (ret) {
+				mlog_errno(ret);
+				goto unlock_rw;
+			}
 
-		di = (struct ocfs2_dinode *)di_bh->b_data;
+			di = (struct ocfs2_dinode *)di_bh->b_data;
 
-		if (inode->i_nlink == 0) {
+			if (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)) {
+				ret = ocfs2_truncate_file(inode, di_bh,
+						i_size_read(inode));
+				if (ret < 0) {
+					if (ret != -ENOSPC)
+						mlog_errno(ret);
+					goto unlock_inode;
+				}
+
+				ret = ocfs2_del_inode_from_orphan(osb, inode,
+						di_bh, 0, 0);
+				if (ret)
+					mlog_errno(ret);
+			}
+unlock_inode:
+			ocfs2_inode_unlock(inode, 1);
+			brelse(di_bh);
+			di_bh = NULL;
+unlock_rw:
+			ocfs2_rw_unlock(inode, 1);
+unlock_mutex:
+			mutex_unlock(&inode->i_mutex);
+
+			/* clear dio flag in ocfs2_inode_info */
+			oi->ip_flags &= ~OCFS2_INODE_DIO_ORPHAN_ENTRY;
+		} else {
 			spin_lock(&oi->ip_lock);
 			/* Set the proper information to get us going into
 			 * ocfs2_delete_inode. */
@@ -2212,28 +2251,6 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 			spin_unlock(&oi->ip_lock);
 		}
 
-		if ((orphan_reco_type == ORPHAN_NEED_TRUNCATE) &&
-				(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
-			ret = ocfs2_truncate_file(inode, di_bh,
-					i_size_read(inode));
-			if (ret < 0) {
-				if (ret != -ENOSPC)
-					mlog_errno(ret);
-				goto unlock_inode;
-			}
-
-			ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
-			if (ret)
-				mlog_errno(ret);
-		} /* else if ORPHAN_NO_NEED_TRUNCATE, do nothing */
-unlock_inode:
-		ocfs2_inode_unlock(inode, 1);
-		brelse(di_bh);
-		di_bh = NULL;
-unlock_rw:
-		ocfs2_rw_unlock(inode, 1);
-next:
-		mutex_unlock(&inode->i_mutex);
 		iput(inode);
 		inode = iter;
 	}

fs/ocfs2/namei.c

@@ -106,8 +106,6 @@ static int ocfs2_double_lock(struct ocfs2_super *osb,
 static void ocfs2_double_unlock(struct inode *inode1, struct inode *inode2);
 /* An orphan dir name is an 8 byte value, printed as a hex string */
 #define OCFS2_ORPHAN_NAMELEN ((int)(2 * sizeof(u64)))
-#define OCFS2_DIO_ORPHAN_PREFIX "dio-"
-#define OCFS2_DIO_ORPHAN_PREFIX_LEN 4
 
 static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
 				   unsigned int flags)
@@ -657,9 +655,18 @@ static int ocfs2_mknod_locked(struct ocfs2_super *osb,
 		return status;
 	}
 
-	return __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
+	status = __ocfs2_mknod_locked(dir, inode, dev, new_fe_bh,
 				    parent_fe_bh, handle, inode_ac,
 				    fe_blkno, suballoc_loc, suballoc_bit);
+	if (status < 0) {
+		u64 bg_blkno = ocfs2_which_suballoc_group(fe_blkno, suballoc_bit);
+		int tmp = ocfs2_free_suballoc_bits(handle, inode_ac->ac_inode,
+				inode_ac->ac_bh, suballoc_bit, bg_blkno, 1);
+		if (tmp)
+			mlog_errno(tmp);
+	}
+
+	return status;
 }
 
 static int ocfs2_mkdir(struct inode *dir,

fs/ocfs2/namei.h

@@ -26,6 +26,9 @@
 #ifndef OCFS2_NAMEI_H
 #define OCFS2_NAMEI_H
 
+#define OCFS2_DIO_ORPHAN_PREFIX "dio-"
+#define OCFS2_DIO_ORPHAN_PREFIX_LEN 4
+
 extern const struct inode_operations ocfs2_dir_iops;
 
 struct dentry *ocfs2_get_parent(struct dentry *child);

fs/ocfs2/refcounttree.c

@@ -2920,16 +2920,13 @@ int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 	u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
 	struct page *page;
 	pgoff_t page_index;
-	unsigned int from, to, readahead_pages;
+	unsigned int from, to;
 	loff_t offset, end, map_end;
 	struct address_space *mapping = inode->i_mapping;
 
 	trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
 					       new_cluster, new_len);
 
-	readahead_pages =
-		(ocfs2_cow_contig_clusters(sb) <<
-		 OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT;
 	offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
 	end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
 	/*

fs/ocfs2/suballoc.c

@@ -1920,7 +1920,10 @@ static int ocfs2_claim_suballoc_bits(struct ocfs2_alloc_context *ac,
 	status = ocfs2_search_chain(ac, handle, bits_wanted, min_bits,
 				    res, &bits_left);
 	if (!status) {
-		hint = ocfs2_group_from_res(res);
+		if (ocfs2_is_cluster_bitmap(ac->ac_inode))
+			hint = res->sr_bg_blkno;
+		else
+			hint = ocfs2_group_from_res(res);
 		goto set_hint;
 	}
 	if (status < 0 && status != -ENOSPC) {

fs/proc/base.c

@@ -1032,6 +1032,16 @@ static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count,
 	return simple_read_from_buffer(buf, count, ppos, buffer, len);
 }
 
+/*
+ * /proc/pid/oom_adj exists solely for backwards compatibility with previous
+ * kernels.  The effective policy is defined by oom_score_adj, which has a
+ * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
+ * Values written to oom_adj are simply mapped linearly to oom_score_adj.
+ * Processes that become oom disabled via oom_adj will still be oom disabled
+ * with this implementation.
+ *
+ * oom_adj cannot be removed since existing userspace binaries use it.
+ */
 static ssize_t oom_adj_write(struct file *file, const char __user *buf,
 			     size_t count, loff_t *ppos)
 {

fs/proc/task_mmu.c

@@ -70,6 +70,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
 		ptes >> 10,
 		pmds >> 10,
 		swap << (PAGE_SHIFT-10));
+	hugetlb_report_usage(m, mm);
 }
 
 unsigned long task_vsize(struct mm_struct *mm)
@@ -446,6 +447,8 @@ struct mem_size_stats {
 	unsigned long anonymous;
 	unsigned long anonymous_thp;
 	unsigned long swap;
+	unsigned long shared_hugetlb;
+	unsigned long private_hugetlb;
 	u64 pss;
 	u64 swap_pss;
 };
@@ -625,12 +628,44 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
 	seq_putc(m, '\n');
 }
 
+#ifdef CONFIG_HUGETLB_PAGE
+static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
+				 unsigned long addr, unsigned long end,
+				 struct mm_walk *walk)
+{
+	struct mem_size_stats *mss = walk->private;
+	struct vm_area_struct *vma = walk->vma;
+	struct page *page = NULL;
+
+	if (pte_present(*pte)) {
+		page = vm_normal_page(vma, addr, *pte);
+	} else if (is_swap_pte(*pte)) {
+		swp_entry_t swpent = pte_to_swp_entry(*pte);
+
+		if (is_migration_entry(swpent))
+			page = migration_entry_to_page(swpent);
+	}
+	if (page) {
+		int mapcount = page_mapcount(page);
+
+		if (mapcount >= 2)
+			mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
+		else
+			mss->private_hugetlb += huge_page_size(hstate_vma(vma));
+	}
+	return 0;
+}
+#endif /* HUGETLB_PAGE */
+
 static int show_smap(struct seq_file *m, void *v, int is_pid)
 {
 	struct vm_area_struct *vma = v;
 	struct mem_size_stats mss;
 	struct mm_walk smaps_walk = {
 		.pmd_entry = smaps_pte_range,
+#ifdef CONFIG_HUGETLB_PAGE
+		.hugetlb_entry = smaps_hugetlb_range,
+#endif
 		.mm = vma->vm_mm,
 		.private = &mss,
 	};
@@ -652,6 +687,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
 		   "Referenced:     %8lu kB\n"
 		   "Anonymous:      %8lu kB\n"
 		   "AnonHugePages:  %8lu kB\n"
+		   "Shared_Hugetlb: %8lu kB\n"
+		   "Private_Hugetlb: %7lu kB\n"
 		   "Swap:           %8lu kB\n"
 		   "SwapPss:        %8lu kB\n"
 		   "KernelPageSize: %8lu kB\n"
@@ -667,6 +704,8 @@ static int show_smap(struct seq_file *m, void *v, int is_pid)
 		   mss.referenced >> 10,
 		   mss.anonymous >> 10,
 		   mss.anonymous_thp >> 10,
+		   mss.shared_hugetlb >> 10,
+		   mss.private_hugetlb >> 10,
 		   mss.swap >> 10,
 		   (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)),
 		   vma_kernel_pagesize(vma) >> 10,
@@ -753,19 +792,27 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,
 	pte_t ptent = *pte;
 
 	if (pte_present(ptent)) {
+		ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
 		ptent = pte_wrprotect(ptent);
 		ptent = pte_clear_soft_dirty(ptent);
+		ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
 	} else if (is_swap_pte(ptent)) {
 		ptent = pte_swp_clear_soft_dirty(ptent);
+		set_pte_at(vma->vm_mm, addr, pte, ptent);
 	}
-
-	set_pte_at(vma->vm_mm, addr, pte, ptent);
 }
+#else
+static inline void clear_soft_dirty(struct vm_area_struct *vma,
+		unsigned long addr, pte_t *pte)
+{
+}
+#endif
 
+#if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
 		unsigned long addr, pmd_t *pmdp)
 {
-	pmd_t pmd = *pmdp;
+	pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
 
 	pmd = pmd_wrprotect(pmd);
 	pmd = pmd_clear_soft_dirty(pmd);
@@ -775,14 +822,7 @@ static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
 
 	set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
 }
-
 #else
-
-static inline void clear_soft_dirty(struct vm_area_struct *vma,
-		unsigned long addr, pte_t *pte)
-{
-}
-
 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
 		unsigned long addr, pmd_t *pmdp)
 {

fs/sync.c

@@ -86,7 +86,12 @@ static void fdatawrite_one_bdev(struct block_device *bdev, void *arg)
 
 static void fdatawait_one_bdev(struct block_device *bdev, void *arg)
 {
-	filemap_fdatawait(bdev->bd_inode->i_mapping);
+	/*
+	 * We keep the error status of individual mapping so that
+	 * applications can catch the writeback error using fsync(2).
+	 * See filemap_fdatawait_keep_errors() for details.
+	 */
+	filemap_fdatawait_keep_errors(bdev->bd_inode->i_mapping);
 }
 
 /*

include/linux/compaction.h

@@ -15,7 +15,8 @@
 /* For more detailed tracepoint output */
 #define COMPACT_NO_SUITABLE_PAGE	5
 #define COMPACT_NOT_SUITABLE_ZONE	6
-/* When adding new state, please change compaction_status_string, too */
+#define COMPACT_CONTENDED		7
+/* When adding new states, please adjust include/trace/events/compaction.h */
 
 /* Used to signal whether compaction detected need_sched() or lock contention */
 /* No contention detected */

include/linux/compiler-gcc.h

@@ -210,6 +210,23 @@
 #define __visible	__attribute__((externally_visible))
 #endif
 
+
+#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
+/*
+ * __assume_aligned(n, k): Tell the optimizer that the returned
+ * pointer can be assumed to be k modulo n. The second argument is
+ * optional (default 0), so we use a variadic macro to make the
+ * shorthand.
+ *
+ * Beware: Do not apply this to functions which may return
+ * ERR_PTRs. Also, it is probably unwise to apply it to functions
+ * returning extra information in the low bits (but in that case the
+ * compiler should see some alignment anyway, when the return value is
+ * massaged by 'flags = ptr & 3; ptr &= ~3;').
+ */
+#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
+#endif
+
 /*
  * GCC 'asm goto' miscompiles certain code sequences:
  *

include/linux/compiler.h

@@ -417,6 +417,14 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
 #define __visible
 #endif
 
+/*
+ * Assume alignment of return value.
+ */
+#ifndef __assume_aligned
+#define __assume_aligned(a, ...)
+#endif
+
+
 /* Are two types/vars the same type (ignoring qualifiers)? */
 #ifndef __same_type
 # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))

include/linux/cpuset.h

@@ -93,7 +93,7 @@ extern int current_cpuset_is_being_rebound(void);
 
 extern void rebuild_sched_domains(void);
 
-extern void cpuset_print_task_mems_allowed(struct task_struct *p);
+extern void cpuset_print_current_mems_allowed(void);
 
 /*
  * read_mems_allowed_begin is required when making decisions involving
@@ -219,7 +219,7 @@ static inline void rebuild_sched_domains(void)
 	partition_sched_domains(1, NULL, NULL);
 }
 
-static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
+static inline void cpuset_print_current_mems_allowed(void)
 {
 }
 

include/linux/fs.h

@@ -2409,6 +2409,7 @@ extern int write_inode_now(struct inode *, int);
 extern int filemap_fdatawrite(struct address_space *);
 extern int filemap_flush(struct address_space *);
 extern int filemap_fdatawait(struct address_space *);
+extern void filemap_fdatawait_keep_errors(struct address_space *);
 extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
 				   loff_t lend);
 extern int filemap_write_and_wait(struct address_space *mapping);

include/linux/hugetlb.h

@@ -483,6 +483,17 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 #define hugepages_supported() (HPAGE_SHIFT != 0)
 #endif
 
+void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
+
+static inline void hugetlb_count_add(long l, struct mm_struct *mm)
+{
+	atomic_long_add(l, &mm->hugetlb_usage);
+}
+
+static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
+{
+	atomic_long_sub(l, &mm->hugetlb_usage);
+}
 #else	/* CONFIG_HUGETLB_PAGE */
 struct hstate {};
 #define alloc_huge_page(v, a, r) NULL
@@ -519,6 +530,14 @@ static inline spinlock_t *huge_pte_lockptr(struct hstate *h,
 {
 	return &mm->page_table_lock;
 }
+
+static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m)
+{
+}
+
+static inline void hugetlb_count_sub(long l, struct mm_struct *mm)
+{
+}
 #endif	/* CONFIG_HUGETLB_PAGE */
 
 static inline spinlock_t *huge_pte_lock(struct hstate *h,

include/linux/memblock.h

@@ -89,10 +89,6 @@ int memblock_add_range(struct memblock_type *type,
 		       phys_addr_t base, phys_addr_t size,
 		       int nid, unsigned long flags);
 
-int memblock_remove_range(struct memblock_type *type,
-			  phys_addr_t base,
-			  phys_addr_t size);
-
 void __next_mem_range(u64 *idx, int nid, ulong flags,
 		      struct memblock_type *type_a,
 		      struct memblock_type *type_b, phys_addr_t *out_start,

include/linux/memcontrol.h

@@ -301,8 +301,7 @@ void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg);
 void mem_cgroup_uncharge(struct page *page);
 void mem_cgroup_uncharge_list(struct list_head *page_list);
 
-void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
-			bool lrucare);
+void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage);
 
 struct lruvec *mem_cgroup_zone_lruvec(struct zone *, struct mem_cgroup *);
 struct lruvec *mem_cgroup_page_lruvec(struct page *, struct zone *);
@@ -384,7 +383,7 @@ unsigned long mem_cgroup_get_lru_size(struct lruvec *lruvec, enum lru_list lru)
 	return mz->lru_size[lru];
 }
 
-static inline int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
+static inline bool mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
 {
 	unsigned long inactive_ratio;
 	unsigned long inactive;
@@ -403,24 +402,26 @@ static inline int mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
 	return inactive * inactive_ratio < active;
 }
 
+void mem_cgroup_handle_over_high(void);
+
 void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
 				struct task_struct *p);
 
 static inline void mem_cgroup_oom_enable(void)
 {
-	WARN_ON(current->memcg_oom.may_oom);
-	current->memcg_oom.may_oom = 1;
+	WARN_ON(current->memcg_may_oom);
+	current->memcg_may_oom = 1;
 }
 
 static inline void mem_cgroup_oom_disable(void)
 {
-	WARN_ON(!current->memcg_oom.may_oom);
-	current->memcg_oom.may_oom = 0;
+	WARN_ON(!current->memcg_may_oom);
+	current->memcg_may_oom = 0;
 }
 
 static inline bool task_in_memcg_oom(struct task_struct *p)
 {
-	return p->memcg_oom.memcg;
+	return p->memcg_in_oom;
 }
 
 bool mem_cgroup_oom_synchronize(bool wait);
@@ -537,9 +538,7 @@ static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
 {
 }
 
-static inline void mem_cgroup_migrate(struct page *oldpage,
-				      struct page *newpage,
-				      bool lrucare)
+static inline void mem_cgroup_replace_page(struct page *old, struct page *new)
 {
 }
 
@@ -585,10 +584,10 @@ static inline bool mem_cgroup_disabled(void)
 	return true;
 }
 
-static inline int
+static inline bool
 mem_cgroup_inactive_anon_is_low(struct lruvec *lruvec)
 {
-	return 1;
+	return true;
 }
 
 static inline bool mem_cgroup_lruvec_online(struct lruvec *lruvec)
@@ -622,6 +621,10 @@ static inline void mem_cgroup_end_page_stat(struct mem_cgroup *memcg)
 {
 }
 
+static inline void mem_cgroup_handle_over_high(void)
+{
+}
+
 static inline void mem_cgroup_oom_enable(void)
 {
 }
@@ -748,11 +751,10 @@ static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
  * conditions, but because they are pretty simple, they are expected to be
  * fast.
  */
-bool __memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg,
-					int order);
-void __memcg_kmem_commit_charge(struct page *page,
-				       struct mem_cgroup *memcg, int order);
-void __memcg_kmem_uncharge_pages(struct page *page, int order);
+int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
+			      struct mem_cgroup *memcg);
+int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
+void __memcg_kmem_uncharge(struct page *page, int order);
 
 /*
  * helper for acessing a memcg's index. It will be used as an index in the
@@ -767,77 +769,42 @@ static inline int memcg_cache_id(struct mem_cgroup *memcg)
 struct kmem_cache *__memcg_kmem_get_cache(struct kmem_cache *cachep);
 void __memcg_kmem_put_cache(struct kmem_cache *cachep);
 
-struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr);
-
-int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
-		      unsigned long nr_pages);
-void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages);
-
-/**
- * memcg_kmem_newpage_charge: verify if a new kmem allocation is allowed.
- * @gfp: the gfp allocation flags.
- * @memcg: a pointer to the memcg this was charged against.
- * @order: allocation order.
- *
- * returns true if the memcg where the current task belongs can hold this
- * allocation.
- *
- * We return true automatically if this allocation is not to be accounted to
- * any memcg.
- */
-static inline bool
-memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
+static inline bool __memcg_kmem_bypass(gfp_t gfp)
 {
 	if (!memcg_kmem_enabled())
 		return true;
-
 	if (gfp & __GFP_NOACCOUNT)
 		return true;
-	/*
-	 * __GFP_NOFAIL allocations will move on even if charging is not
-	 * possible. Therefore we don't even try, and have this allocation
-	 * unaccounted. We could in theory charge it forcibly, but we hope
-	 * those allocations are rare, and won't be worth the trouble.
-	 */
-	if (gfp & __GFP_NOFAIL)
-		return true;
 	if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
 		return true;
-
-	/* If the test is dying, just let it go. */
-	if (unlikely(fatal_signal_pending(current)))
-		return true;
-
-	return __memcg_kmem_newpage_charge(gfp, memcg, order);
+	return false;
 }
 
 /**
- * memcg_kmem_uncharge_pages: uncharge pages from memcg
- * @page: pointer to struct page being freed
- * @order: allocation order.
+ * memcg_kmem_charge: charge a kmem page
+ * @page: page to charge
+ * @gfp: reclaim mode
+ * @order: allocation order
+ *
+ * Returns 0 on success, an error code on failure.
  */
-static inline void
-memcg_kmem_uncharge_pages(struct page *page, int order)
+static __always_inline int memcg_kmem_charge(struct page *page,
+					     gfp_t gfp, int order)
 {
-	if (memcg_kmem_enabled())
-		__memcg_kmem_uncharge_pages(page, order);
+	if (__memcg_kmem_bypass(gfp))
+		return 0;
+	return __memcg_kmem_charge(page, gfp, order);
 }
 
 /**
- * memcg_kmem_commit_charge: embeds correct memcg in a page
- * @page: pointer to struct page recently allocated
- * @memcg: the memcg structure we charged against
- * @order: allocation order.
- *
- * Needs to be called after memcg_kmem_newpage_charge, regardless of success or
- * failure of the allocation. if @page is NULL, this function will revert the
- * charges. Otherwise, it will commit @page to @memcg.
+ * memcg_kmem_uncharge: uncharge a kmem page
+ * @page: page to uncharge
+ * @order: allocation order
  */
-static inline void
-memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
+static __always_inline void memcg_kmem_uncharge(struct page *page, int order)
 {
-	if (memcg_kmem_enabled() && memcg)
-		__memcg_kmem_commit_charge(page, memcg, order);
+	if (memcg_kmem_enabled())
+		__memcg_kmem_uncharge(page, order);
 }
 
 /**
@@ -850,17 +817,8 @@ memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
 static __always_inline struct kmem_cache *
 memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
 {
-	if (!memcg_kmem_enabled())
-		return cachep;
-	if (gfp & __GFP_NOACCOUNT)
-		return cachep;
-	if (gfp & __GFP_NOFAIL)
-		return cachep;
-	if (in_interrupt() || (!current->mm) || (current->flags & PF_KTHREAD))
+	if (__memcg_kmem_bypass(gfp))
 		return cachep;
-	if (unlikely(fatal_signal_pending(current)))
-		return cachep;
-
 	return __memcg_kmem_get_cache(cachep);
 }
 
@@ -869,13 +827,6 @@ static __always_inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
 	if (memcg_kmem_enabled())
 		__memcg_kmem_put_cache(cachep);
 }
-
-static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
-{
-	if (!memcg_kmem_enabled())
-		return NULL;
-	return __mem_cgroup_from_kmem(ptr);
-}
 #else
 #define for_each_memcg_cache_index(_idx)	\
 	for (; NULL; )
@@ -890,18 +841,12 @@ static inline bool memcg_kmem_is_active(struct mem_cgroup *memcg)
 	return false;
 }
 
-static inline bool
-memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **memcg, int order)
-{
-	return true;
-}
-
-static inline void memcg_kmem_uncharge_pages(struct page *page, int order)
+static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
 {
+	return 0;
 }
 
-static inline void
-memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg, int order)
+static inline void memcg_kmem_uncharge(struct page *page, int order)
 {
 }
 
@@ -927,11 +872,5 @@ memcg_kmem_get_cache(struct kmem_cache *cachep, gfp_t gfp)
 static inline void memcg_kmem_put_cache(struct kmem_cache *cachep)
 {
 }
-
-static inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
-{
-	return NULL;
-}
 #endif /* CONFIG_MEMCG_KMEM */
 #endif /* _LINUX_MEMCONTROL_H */
-

include/linux/mm.h

@@ -139,6 +139,7 @@ extern unsigned int kobjsize(const void *objp);
 
 #define VM_DONTCOPY	0x00020000      /* Do not copy this vma on fork */
 #define VM_DONTEXPAND	0x00040000	/* Cannot expand with mremap() */
+#define VM_LOCKONFAULT	0x00080000	/* Lock the pages covered when they are faulted in */
 #define VM_ACCOUNT	0x00100000	/* Is a VM accounted object */
 #define VM_NORESERVE	0x00200000	/* should the VM suppress accounting */
 #define VM_HUGETLB	0x00400000	/* Huge TLB Page VM */
@@ -202,6 +203,9 @@ extern unsigned int kobjsize(const void *objp);
 /* This mask defines which mm->def_flags a process can inherit its parent */
 #define VM_INIT_DEF_MASK	VM_NOHUGEPAGE
 
+/* This mask is used to clear all the VMA flags used by mlock */
+#define VM_LOCKED_CLEAR_MASK	(~(VM_LOCKED | VM_LOCKONFAULT))
+
 /*
  * mapping from the currently active vm_flags protection bits (the
  * low four bits) to a page protection mask..
@@ -1606,8 +1610,10 @@ static inline void pgtable_init(void)
 
 static inline bool pgtable_page_ctor(struct page *page)
 {
+	if (!ptlock_init(page))
+		return false;
 	inc_zone_page_state(page, NR_PAGETABLE);
-	return ptlock_init(page);
+	return true;
 }
 
 static inline void pgtable_page_dtor(struct page *page)
@@ -2036,8 +2042,6 @@ void page_cache_async_readahead(struct address_space *mapping,
 				pgoff_t offset,
 				unsigned long size);
 
-unsigned long max_sane_readahead(unsigned long nr);
-
 /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */
 extern int expand_stack(struct vm_area_struct *vma, unsigned long address);
 
@@ -2137,6 +2141,7 @@ static inline struct page *follow_page(struct vm_area_struct *vma,
 #define FOLL_NUMA	0x200	/* force NUMA hinting page fault */
 #define FOLL_MIGRATION	0x400	/* wait for page to replace migration entry */
 #define FOLL_TRIED	0x800	/* a retry, previous pass started an IO */
+#define FOLL_MLOCK	0x1000	/* lock present pages */
 
 typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
 			void *data);

include/linux/mm_types.h

@@ -486,6 +486,9 @@ struct mm_struct {
 	/* address of the bounds directory */
 	void __user *bd_addr;
 #endif
+#ifdef CONFIG_HUGETLB_PAGE
+	atomic_long_t hugetlb_usage;
+#endif
 };
 
 static inline void mm_init_cpumask(struct mm_struct *mm)

include/linux/mmzone.h

@@ -823,8 +823,7 @@ enum memmap_context {
 	MEMMAP_HOTPLUG,
 };
 extern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn,
-				     unsigned long size,
-				     enum memmap_context context);
+				     unsigned long size);
 
 extern void lruvec_init(struct lruvec *lruvec);
 

include/linux/nmi.h

@@ -73,6 +73,7 @@ extern int watchdog_user_enabled;
 extern int watchdog_thresh;
 extern unsigned long *watchdog_cpumask_bits;
 extern int sysctl_softlockup_all_cpu_backtrace;
+extern int sysctl_hardlockup_all_cpu_backtrace;
 struct ctl_table;
 extern int proc_watchdog(struct ctl_table *, int ,
 			 void __user *, size_t *, loff_t *);

include/linux/page-flags.h

@@ -256,7 +256,7 @@ PAGEFLAG(Readahead, reclaim) TESTCLEARFLAG(Readahead, reclaim)
  * Must use a macro here due to header dependency issues. page_zone() is not
  * available at this point.
  */
-#define PageHighMem(__p) is_highmem(page_zone(__p))
+#define PageHighMem(__p) is_highmem_idx(page_zonenum(__p))
 #else
 PAGEFLAG_FALSE(HighMem)
 #endif

include/linux/page_counter.h

@@ -36,9 +36,9 @@ static inline unsigned long page_counter_read(struct page_counter *counter)
 
 void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages);
 void page_counter_charge(struct page_counter *counter, unsigned long nr_pages);
-int page_counter_try_charge(struct page_counter *counter,
-			    unsigned long nr_pages,
-			    struct page_counter **fail);
+bool page_counter_try_charge(struct page_counter *counter,
+			     unsigned long nr_pages,
+			     struct page_counter **fail);
 void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages);
 int page_counter_limit(struct page_counter *counter, unsigned long limit);
 int page_counter_memparse(const char *buf, const char *max,

include/linux/sched.h

@@ -384,6 +384,7 @@ extern int proc_dowatchdog_thresh(struct ctl_table *table, int write,
 				  void __user *buffer,
 				  size_t *lenp, loff_t *ppos);
 extern unsigned int  softlockup_panic;
+extern unsigned int  hardlockup_panic;
 void lockup_detector_init(void);
 #else
 static inline void touch_softlockup_watchdog(void)
@@ -1460,7 +1461,9 @@ struct task_struct {
 	unsigned sched_reset_on_fork:1;
 	unsigned sched_contributes_to_load:1;
 	unsigned sched_migrated:1;
-
+#ifdef CONFIG_MEMCG
+	unsigned memcg_may_oom:1;
+#endif
 #ifdef CONFIG_MEMCG_KMEM
 	unsigned memcg_kmem_skip_account:1;
 #endif
@@ -1791,12 +1794,12 @@ struct task_struct {
 	unsigned long trace_recursion;
 #endif /* CONFIG_TRACING */
 #ifdef CONFIG_MEMCG
-	struct memcg_oom_info {
-		struct mem_cgroup *memcg;
-		gfp_t gfp_mask;
-		int order;
-		unsigned int may_oom:1;
-	} memcg_oom;
+	struct mem_cgroup *memcg_in_oom;
+	gfp_t memcg_oom_gfp_mask;
+	int memcg_oom_order;
+
+	/* number of pages to reclaim on returning to userland */
+	unsigned int memcg_nr_pages_over_high;
 #endif
 #ifdef CONFIG_UPROBES
 	struct uprobe_task *utask;

include/linux/slab.h

@@ -111,7 +111,7 @@ struct mem_cgroup;
  * struct kmem_cache related prototypes
  */
 void __init kmem_cache_init(void);
-int slab_is_available(void);
+bool slab_is_available(void);
 
 struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
 			unsigned long,

include/linux/syscalls.h

@@ -887,4 +887,6 @@ asmlinkage long sys_execveat(int dfd, const char __user *filename,
 
 asmlinkage long sys_membarrier(int cmd, int flags);
 
+asmlinkage long sys_mlock2(unsigned long start, size_t len, int flags);
+
 #endif

include/linux/tracehook.h

@@ -50,6 +50,7 @@
 #include <linux/ptrace.h>
 #include <linux/security.h>
 #include <linux/task_work.h>
+#include <linux/memcontrol.h>
 struct linux_binprm;
 
 /*
@@ -188,6 +189,8 @@ static inline void tracehook_notify_resume(struct pt_regs *regs)
 	smp_mb__after_atomic();
 	if (unlikely(current->task_works))
 		task_work_run();
+
+	mem_cgroup_handle_over_high();
 }
 
 #endif	/* <linux/tracehook.h> */

include/linux/types.h

@@ -205,11 +205,25 @@ struct ustat {
  * struct callback_head - callback structure for use with RCU and task_work
  * @next: next update requests in a list
  * @func: actual update function to call after the grace period.
+ *
+ * The struct is aligned to size of pointer. On most architectures it happens
+ * naturally due ABI requirements, but some architectures (like CRIS) have
+ * weird ABI and we need to ask it explicitly.
+ *
+ * The alignment is required to guarantee that bits 0 and 1 of @next will be
+ * clear under normal conditions -- as long as we use call_rcu(),
+ * call_rcu_bh(), call_rcu_sched(), or call_srcu() to queue callback.
+ *
+ * This guarantee is important for few reasons:
+ *  - future call_rcu_lazy() will make use of lower bits in the pointer;
+ *  - the structure shares storage spacer in struct page with @compound_head,
+ *    which encode PageTail() in bit 0. The guarantee is needed to avoid
+ *    false-positive PageTail().
  */
 struct callback_head {
 	struct callback_head *next;
 	void (*func)(struct callback_head *head);
-};
+} __attribute__((aligned(sizeof(void *))));
 #define rcu_head callback_head
 
 typedef void (*rcu_callback_t)(struct rcu_head *head);

include/linux/uaccess.h

@@ -75,36 +75,6 @@ static inline unsigned long __copy_from_user_nocache(void *to,
 
 #endif		/* ARCH_HAS_NOCACHE_UACCESS */
 
-/**
- * probe_kernel_address(): safely attempt to read from a location
- * @addr: address to read from - its type is type typeof(retval)*
- * @retval: read into this variable
- *
- * Safely read from address @addr into variable @revtal.  If a kernel fault
- * happens, handle that and return -EFAULT.
- * We ensure that the __get_user() is executed in atomic context so that
- * do_page_fault() doesn't attempt to take mmap_sem.  This makes
- * probe_kernel_address() suitable for use within regions where the caller
- * already holds mmap_sem, or other locks which nest inside mmap_sem.
- * This must be a macro because __get_user() needs to know the types of the
- * args.
- *
- * We don't include enough header files to be able to do the set_fs().  We
- * require that the probe_kernel_address() caller will do that.
- */
-#define probe_kernel_address(addr, retval)		\
-	({						\
-		long ret;				\
-		mm_segment_t old_fs = get_fs();		\
-							\
-		set_fs(KERNEL_DS);			\
-		pagefault_disable();			\
-		ret = __copy_from_user_inatomic(&(retval), (__force typeof(retval) __user *)(addr), sizeof(retval));		\
-		pagefault_enable();			\
-		set_fs(old_fs);				\
-		ret;					\
-	})
-
 /*
  * probe_kernel_read(): safely attempt to read from a location
  * @dst: pointer to the buffer that shall take the data
@@ -131,4 +101,14 @@ extern long notrace __probe_kernel_write(void *dst, const void *src, size_t size
 
 extern long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count);
 
+/**
+ * probe_kernel_address(): safely attempt to read from a location
+ * @addr: address to read from
+ * @retval: read into this variable
+ *
+ * Returns 0 on success, or -EFAULT.
+ */
+#define probe_kernel_address(addr, retval)		\
+	probe_kernel_read(&retval, addr, sizeof(retval))
+
 #endif		/* __LINUX_UACCESS_H__ */

include/linux/vm_event_item.h

@@ -14,12 +14,12 @@
 #endif
 
 #ifdef CONFIG_HIGHMEM
-#define HIGHMEM_ZONE(xx) , xx##_HIGH
+#define HIGHMEM_ZONE(xx) xx##_HIGH,
 #else
 #define HIGHMEM_ZONE(xx)
 #endif
 
-#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx) , xx##_MOVABLE
+#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL, HIGHMEM_ZONE(xx) xx##_MOVABLE
 
 enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 		FOR_ALL_ZONES(PGALLOC),

include/linux/vmstat.h

@@ -161,30 +161,8 @@ static inline unsigned long zone_page_state_snapshot(struct zone *zone,
 }
 
 #ifdef CONFIG_NUMA
-/*
- * Determine the per node value of a stat item. This function
- * is called frequently in a NUMA machine, so try to be as
- * frugal as possible.
- */
-static inline unsigned long node_page_state(int node,
-				 enum zone_stat_item item)
-{
-	struct zone *zones = NODE_DATA(node)->node_zones;
-
-	return
-#ifdef CONFIG_ZONE_DMA
-		zone_page_state(&zones[ZONE_DMA], item) +
-#endif
-#ifdef CONFIG_ZONE_DMA32
-		zone_page_state(&zones[ZONE_DMA32], item) +
-#endif
-#ifdef CONFIG_HIGHMEM
-		zone_page_state(&zones[ZONE_HIGHMEM], item) +
-#endif
-		zone_page_state(&zones[ZONE_NORMAL], item) +
-		zone_page_state(&zones[ZONE_MOVABLE], item);
-}
 
+extern unsigned long node_page_state(int node, enum zone_stat_item item);
 extern void zone_statistics(struct zone *, struct zone *, gfp_t gfp);
 
 #else
@@ -269,7 +247,6 @@ static inline void __dec_zone_page_state(struct page *page,
 
 #define set_pgdat_percpu_threshold(pgdat, callback) { }
 
-static inline void refresh_cpu_vm_stats(int cpu) { }
 static inline void refresh_zone_stat_thresholds(void) { }
 static inline void cpu_vm_stats_fold(int cpu) { }
 

include/trace/events/compaction.h

@@ -9,6 +9,62 @@
 #include <linux/tracepoint.h>
 #include <trace/events/gfpflags.h>
 
+#define COMPACTION_STATUS					\
+	EM( COMPACT_DEFERRED,		"deferred")		\
+	EM( COMPACT_SKIPPED,		"skipped")		\
+	EM( COMPACT_CONTINUE,		"continue")		\
+	EM( COMPACT_PARTIAL,		"partial")		\
+	EM( COMPACT_COMPLETE,		"complete")		\
+	EM( COMPACT_NO_SUITABLE_PAGE,	"no_suitable_page")	\
+	EM( COMPACT_NOT_SUITABLE_ZONE,	"not_suitable_zone")	\
+	EMe(COMPACT_CONTENDED,		"contended")
+
+#ifdef CONFIG_ZONE_DMA
+#define IFDEF_ZONE_DMA(X) X
+#else
+#define IFDEF_ZONE_DMA(X)
+#endif
+
+#ifdef CONFIG_ZONE_DMA32
+#define IFDEF_ZONE_DMA32(X) X
+#else
+#define IFDEF_ZONE_DMA32(X)
+#endif
+
+#ifdef CONFIG_HIGHMEM
+#define IFDEF_ZONE_HIGHMEM(X) X
+#else
+#define IFDEF_ZONE_HIGHMEM(X)
+#endif
+
+#define ZONE_TYPE						\
+	IFDEF_ZONE_DMA(		EM (ZONE_DMA,	 "DMA"))	\
+	IFDEF_ZONE_DMA32(	EM (ZONE_DMA32,	 "DMA32"))	\
+				EM (ZONE_NORMAL, "Normal")	\
+	IFDEF_ZONE_HIGHMEM(	EM (ZONE_HIGHMEM,"HighMem"))	\
+				EMe(ZONE_MOVABLE,"Movable")
+
+/*
+ * First define the enums in the above macros to be exported to userspace
+ * via TRACE_DEFINE_ENUM().
+ */
+#undef EM
+#undef EMe
+#define EM(a, b)	TRACE_DEFINE_ENUM(a);
+#define EMe(a, b)	TRACE_DEFINE_ENUM(a);
+
+COMPACTION_STATUS
+ZONE_TYPE
+
+/*
+ * Now redefine the EM() and EMe() macros to map the enums to the strings
+ * that will be printed in the output.
+ */
+#undef EM
+#undef EMe
+#define EM(a, b)	{a, b},
+#define EMe(a, b)	{a, b}
+
 DECLARE_EVENT_CLASS(mm_compaction_isolate_template,
 
 	TP_PROTO(
@@ -161,7 +217,7 @@ TRACE_EVENT(mm_compaction_end,
 		__entry->free_pfn,
 		__entry->zone_end,
 		__entry->sync ? "sync" : "async",
-		compaction_status_string[__entry->status])
+		__print_symbolic(__entry->status, COMPACTION_STATUS))
 );
 
 TRACE_EVENT(mm_compaction_try_to_compact_pages,
@@ -201,23 +257,23 @@ DECLARE_EVENT_CLASS(mm_compaction_suitable_template,
 
 	TP_STRUCT__entry(
 		__field(int, nid)
-		__field(char *, name)
+		__field(enum zone_type, idx)
 		__field(int, order)
 		__field(int, ret)
 	),
 
 	TP_fast_assign(
 		__entry->nid = zone_to_nid(zone);
-		__entry->name = (char *)zone->name;
+		__entry->idx = zone_idx(zone);
 		__entry->order = order;
 		__entry->ret = ret;
 	),
 
 	TP_printk("node=%d zone=%-8s order=%d ret=%s",
 		__entry->nid,
-		__entry->name,
+		__print_symbolic(__entry->idx, ZONE_TYPE),
 		__entry->order,
-		compaction_status_string[__entry->ret])
+		__print_symbolic(__entry->ret, COMPACTION_STATUS))
 );
 
 DEFINE_EVENT(mm_compaction_suitable_template, mm_compaction_finished,
@@ -247,7 +303,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template,
 
 	TP_STRUCT__entry(
 		__field(int, nid)
-		__field(char *, name)
+		__field(enum zone_type, idx)
 		__field(int, order)
 		__field(unsigned int, considered)
 		__field(unsigned int, defer_shift)
@@ -256,7 +312,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template,
 
 	TP_fast_assign(
 		__entry->nid = zone_to_nid(zone);
-		__entry->name = (char *)zone->name;
+		__entry->idx = zone_idx(zone);
 		__entry->order = order;
 		__entry->considered = zone->compact_considered;
 		__entry->defer_shift = zone->compact_defer_shift;
@@ -265,7 +321,7 @@ DECLARE_EVENT_CLASS(mm_compaction_defer_template,
 
 	TP_printk("node=%d zone=%-8s order=%d order_failed=%d consider=%u limit=%lu",
 		__entry->nid,
-		__entry->name,
+		__print_symbolic(__entry->idx, ZONE_TYPE),
 		__entry->order,
 		__entry->order_failed,
 		__entry->considered,

include/uapi/asm-generic/mman-common.h

@@ -25,6 +25,11 @@
 # define MAP_UNINITIALIZED 0x0		/* Don't support this flag */
 #endif
 
+/*
+ * Flags for mlock
+ */
+#define MLOCK_ONFAULT	0x01		/* Lock pages in range after they are faulted in, do not prefault */
+
 #define MS_ASYNC	1		/* sync memory asynchronously */
 #define MS_INVALIDATE	2		/* invalidate the caches */
 #define MS_SYNC		4		/* synchronous memory sync */

include/uapi/asm-generic/mman.h

@@ -17,5 +17,6 @@
 
 #define MCL_CURRENT	1		/* lock all current mappings */
 #define MCL_FUTURE	2		/* lock all future mappings */
+#define MCL_ONFAULT	4		/* lock all pages that are faulted in */
 
 #endif /* __ASM_GENERIC_MMAN_H */

include/uapi/asm-generic/unistd.h

@@ -713,9 +713,11 @@ __SC_COMP(__NR_execveat, sys_execveat, compat_sys_execveat)
 __SYSCALL(__NR_userfaultfd, sys_userfaultfd)
 #define __NR_membarrier 283
 __SYSCALL(__NR_membarrier, sys_membarrier)
+#define __NR_mlock2 284
+__SYSCALL(__NR_mlock2, sys_mlock2)
 
 #undef __NR_syscalls
-#define __NR_syscalls 284
+#define __NR_syscalls 285
 
 /*
  * All syscalls below here should go away really,

kernel/cpuset.c

@@ -2598,22 +2598,22 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 }
 
 /**
- * cpuset_print_task_mems_allowed - prints task's cpuset and mems_allowed
- * @tsk: pointer to task_struct of some task.
+ * cpuset_print_current_mems_allowed - prints current's cpuset and mems_allowed
  *
- * Description: Prints @task's name, cpuset name, and cached copy of its
+ * Description: Prints current's name, cpuset name, and cached copy of its
  * mems_allowed to the kernel log.
  */
-void cpuset_print_task_mems_allowed(struct task_struct *tsk)
+void cpuset_print_current_mems_allowed(void)
 {
 	struct cgroup *cgrp;
 
 	rcu_read_lock();
 
-	cgrp = task_cs(tsk)->css.cgroup;
-	pr_info("%s cpuset=", tsk->comm);
+	cgrp = task_cs(current)->css.cgroup;
+	pr_info("%s cpuset=", current->comm);
 	pr_cont_cgroup_name(cgrp);
-	pr_cont(" mems_allowed=%*pbl\n", nodemask_pr_args(&tsk->mems_allowed));
+	pr_cont(" mems_allowed=%*pbl\n",
+		nodemask_pr_args(&current->mems_allowed));
 
 	rcu_read_unlock();
 }

kernel/fork.c

@@ -455,7 +455,8 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
 		tmp->vm_mm = mm;
 		if (anon_vma_fork(tmp, mpnt))
 			goto fail_nomem_anon_vma_fork;
-		tmp->vm_flags &= ~(VM_LOCKED|VM_UFFD_MISSING|VM_UFFD_WP);
+		tmp->vm_flags &=
+			~(VM_LOCKED|VM_LOCKONFAULT|VM_UFFD_MISSING|VM_UFFD_WP);
 		tmp->vm_next = tmp->vm_prev = NULL;
 		tmp->vm_userfaultfd_ctx = NULL_VM_UFFD_CTX;
 		file = tmp->vm_file;

kernel/sys_ni.c

@@ -194,6 +194,7 @@ cond_syscall(sys_mlock);
 cond_syscall(sys_munlock);
 cond_syscall(sys_mlockall);
 cond_syscall(sys_munlockall);
+cond_syscall(sys_mlock2);
 cond_syscall(sys_mincore);
 cond_syscall(sys_madvise);
 cond_syscall(sys_mremap);

kernel/sysctl.c

@@ -888,6 +888,17 @@ static struct ctl_table kern_table[] = {
 		.extra1		= &zero,
 		.extra2		= &one,
 	},
+#ifdef CONFIG_HARDLOCKUP_DETECTOR
+	{
+		.procname	= "hardlockup_panic",
+		.data		= &hardlockup_panic,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &one,
+	},
+#endif
 #ifdef CONFIG_SMP
 	{
 		.procname	= "softlockup_all_cpu_backtrace",
@@ -898,6 +909,15 @@ static struct ctl_table kern_table[] = {
 		.extra1		= &zero,
 		.extra2		= &one,
 	},
+	{
+		.procname	= "hardlockup_all_cpu_backtrace",
+		.data		= &sysctl_hardlockup_all_cpu_backtrace,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &zero,
+		.extra2		= &one,
+	},
 #endif /* CONFIG_SMP */
 #endif
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)

kernel/watchdog.c

@@ -57,8 +57,10 @@ int __read_mostly watchdog_thresh = 10;
 
 #ifdef CONFIG_SMP
 int __read_mostly sysctl_softlockup_all_cpu_backtrace;
+int __read_mostly sysctl_hardlockup_all_cpu_backtrace;
 #else
 #define sysctl_softlockup_all_cpu_backtrace 0
+#define sysctl_hardlockup_all_cpu_backtrace 0
 #endif
 static struct cpumask watchdog_cpumask __read_mostly;
 unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask);
@@ -110,8 +112,9 @@ static unsigned long soft_lockup_nmi_warn;
  * Should we panic when a soft-lockup or hard-lockup occurs:
  */
 #ifdef CONFIG_HARDLOCKUP_DETECTOR
-static int hardlockup_panic =
+unsigned int __read_mostly hardlockup_panic =
 			CONFIG_BOOTPARAM_HARDLOCKUP_PANIC_VALUE;
+static unsigned long hardlockup_allcpu_dumped;
 /*
  * We may not want to enable hard lockup detection by default in all cases,
  * for example when running the kernel as a guest on a hypervisor. In these
@@ -173,6 +176,13 @@ static int __init softlockup_all_cpu_backtrace_setup(char *str)
 	return 1;
 }
 __setup("softlockup_all_cpu_backtrace=", softlockup_all_cpu_backtrace_setup);
+static int __init hardlockup_all_cpu_backtrace_setup(char *str)
+{
+	sysctl_hardlockup_all_cpu_backtrace =
+		!!simple_strtol(str, NULL, 0);
+	return 1;
+}
+__setup("hardlockup_all_cpu_backtrace=", hardlockup_all_cpu_backtrace_setup);
 #endif
 
 /*
@@ -263,15 +273,15 @@ void touch_softlockup_watchdog_sync(void)
 
 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 /* watchdog detector functions */
-static int is_hardlockup(void)
+static bool is_hardlockup(void)
 {
 	unsigned long hrint = __this_cpu_read(hrtimer_interrupts);
 
 	if (__this_cpu_read(hrtimer_interrupts_saved) == hrint)
-		return 1;
+		return true;
 
 	__this_cpu_write(hrtimer_interrupts_saved, hrint);
-	return 0;
+	return false;
 }
 #endif
 
@@ -279,7 +289,7 @@ static int is_softlockup(unsigned long touch_ts)
 {
 	unsigned long now = get_timestamp();
 
-	if (watchdog_enabled & SOFT_WATCHDOG_ENABLED) {
+	if ((watchdog_enabled & SOFT_WATCHDOG_ENABLED) && watchdog_thresh){
 		/* Warn about unreasonable delays. */
 		if (time_after(now, touch_ts + get_softlockup_thresh()))
 			return now - touch_ts;
@@ -318,17 +328,30 @@ static void watchdog_overflow_callback(struct perf_event *event,
 	 */
 	if (is_hardlockup()) {
 		int this_cpu = smp_processor_id();
+		struct pt_regs *regs = get_irq_regs();
 
 		/* only print hardlockups once */
 		if (__this_cpu_read(hard_watchdog_warn) == true)
 			return;
 
-		if (hardlockup_panic)
-			panic("Watchdog detected hard LOCKUP on cpu %d",
-			      this_cpu);
+		pr_emerg("Watchdog detected hard LOCKUP on cpu %d", this_cpu);
+		print_modules();
+		print_irqtrace_events(current);
+		if (regs)
+			show_regs(regs);
 		else
-			WARN(1, "Watchdog detected hard LOCKUP on cpu %d",
-			     this_cpu);
+			dump_stack();
+
+		/*
+		 * Perform all-CPU dump only once to avoid multiple hardlockups
+		 * generating interleaving traces
+		 */
+		if (sysctl_hardlockup_all_cpu_backtrace &&
+				!test_and_set_bit(0, &hardlockup_allcpu_dumped))
+			trigger_allbutself_cpu_backtrace();
+
+		if (hardlockup_panic)
+			panic("Hard LOCKUP");
 
 		__this_cpu_write(hard_watchdog_warn, true);
 		return;
@@ -347,6 +370,9 @@ static void watchdog_interrupt_count(void)
 static int watchdog_nmi_enable(unsigned int cpu);
 static void watchdog_nmi_disable(unsigned int cpu);
 
+static int watchdog_enable_all_cpus(void);
+static void watchdog_disable_all_cpus(void);
+
 /* watchdog kicker functions */
 static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
 {
@@ -651,37 +677,41 @@ static struct smp_hotplug_thread watchdog_threads = {
 
 /*
  * park all watchdog threads that are specified in 'watchdog_cpumask'
+ *
+ * This function returns an error if kthread_park() of a watchdog thread
+ * fails. In this situation, the watchdog threads of some CPUs can already
+ * be parked and the watchdog threads of other CPUs can still be runnable.
+ * Callers are expected to handle this special condition as appropriate in
+ * their context.
+ *
+ * This function may only be called in a context that is protected against
+ * races with CPU hotplug - for example, via get_online_cpus().
  */
 static int watchdog_park_threads(void)
 {
 	int cpu, ret = 0;
 
-	get_online_cpus();
 	for_each_watchdog_cpu(cpu) {
 		ret = kthread_park(per_cpu(softlockup_watchdog, cpu));
 		if (ret)
 			break;
 	}
-	if (ret) {
-		for_each_watchdog_cpu(cpu)
-			kthread_unpark(per_cpu(softlockup_watchdog, cpu));
-	}
-	put_online_cpus();
 
 	return ret;
 }
 
 /*
  * unpark all watchdog threads that are specified in 'watchdog_cpumask'
+ *
+ * This function may only be called in a context that is protected against
+ * races with CPU hotplug - for example, via get_online_cpus().
  */
 static void watchdog_unpark_threads(void)
 {
 	int cpu;
 
-	get_online_cpus();
 	for_each_watchdog_cpu(cpu)
 		kthread_unpark(per_cpu(softlockup_watchdog, cpu));
-	put_online_cpus();
 }
 
 /*
@@ -691,6 +721,7 @@ int lockup_detector_suspend(void)
 {
 	int ret = 0;
 
+	get_online_cpus();
 	mutex_lock(&watchdog_proc_mutex);
 	/*
 	 * Multiple suspend requests can be active in parallel (counted by
@@ -704,6 +735,11 @@ int lockup_detector_suspend(void)
 
 	if (ret == 0)
 		watchdog_suspended++;
+	else {
+		watchdog_disable_all_cpus();
+		pr_err("Failed to suspend lockup detectors, disabled\n");
+		watchdog_enabled = 0;
+	}
 
 	mutex_unlock(&watchdog_proc_mutex);
 
@@ -726,12 +762,20 @@ void lockup_detector_resume(void)
 		watchdog_unpark_threads();
 
 	mutex_unlock(&watchdog_proc_mutex);
+	put_online_cpus();
 }
 
-static void update_watchdog_all_cpus(void)
+static int update_watchdog_all_cpus(void)
 {
-	watchdog_park_threads();
+	int ret;
+
+	ret = watchdog_park_threads();
+	if (ret)
+		return ret;
+
 	watchdog_unpark_threads();
+
+	return 0;
 }
 
 static int watchdog_enable_all_cpus(void)
@@ -750,15 +794,20 @@ static int watchdog_enable_all_cpus(void)
 		 * Enable/disable the lockup detectors or
 		 * change the sample period 'on the fly'.
 		 */
-		update_watchdog_all_cpus();
+		err = update_watchdog_all_cpus();
+
+		if (err) {
+			watchdog_disable_all_cpus();
+			pr_err("Failed to update lockup detectors, disabled\n");
+		}
 	}
 
+	if (err)
+		watchdog_enabled = 0;
+
 	return err;
 }
 
-/* prepare/enable/disable routines */
-/* sysctl functions */
-#ifdef CONFIG_SYSCTL
 static void watchdog_disable_all_cpus(void)
 {
 	if (watchdog_running) {
@@ -767,6 +816,8 @@ static void watchdog_disable_all_cpus(void)
 	}
 }
 
+#ifdef CONFIG_SYSCTL
+
 /*
  * Update the run state of the lockup detectors.
  */
@@ -808,6 +859,7 @@ static int proc_watchdog_common(int which, struct ctl_table *table, int write,
 	int err, old, new;
 	int *watchdog_param = (int *)table->data;
 
+	get_online_cpus();
 	mutex_lock(&watchdog_proc_mutex);
 
 	if (watchdog_suspended) {
@@ -849,15 +901,17 @@ static int proc_watchdog_common(int which, struct ctl_table *table, int write,
 		} while (cmpxchg(&watchdog_enabled, old, new) != old);
 
 		/*
-		 * Update the run state of the lockup detectors.
-		 * Restore 'watchdog_enabled' on failure.
+		 * Update the run state of the lockup detectors. There is _no_
+		 * need to check the value returned by proc_watchdog_update()
+		 * and to restore the previous value of 'watchdog_enabled' as
+		 * both lockup detectors are disabled if proc_watchdog_update()
+		 * returns an error.
 		 */
 		err = proc_watchdog_update();
-		if (err)
-			watchdog_enabled = old;
 	}
 out:
 	mutex_unlock(&watchdog_proc_mutex);
+	put_online_cpus();
 	return err;
 }
 
@@ -899,6 +953,7 @@ int proc_watchdog_thresh(struct ctl_table *table, int write,
 {
 	int err, old;
 
+	get_online_cpus();
 	mutex_lock(&watchdog_proc_mutex);
 
 	if (watchdog_suspended) {
@@ -914,15 +969,17 @@ int proc_watchdog_thresh(struct ctl_table *table, int write,
 		goto out;
 
 	/*
-	 * Update the sample period.
-	 * Restore 'watchdog_thresh' on failure.
+	 * Update the sample period. Restore on failure.
 	 */
 	set_sample_period();
 	err = proc_watchdog_update();
-	if (err)
+	if (err) {
 		watchdog_thresh = old;
+		set_sample_period();
+	}
 out:
 	mutex_unlock(&watchdog_proc_mutex);
+	put_online_cpus();
 	return err;
 }
 
@@ -937,6 +994,7 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write,
 {
 	int err;
 
+	get_online_cpus();
 	mutex_lock(&watchdog_proc_mutex);
 
 	if (watchdog_suspended) {
@@ -964,6 +1022,7 @@ int proc_watchdog_cpumask(struct ctl_table *table, int write,
 	}
 out:
 	mutex_unlock(&watchdog_proc_mutex);
+	put_online_cpus();
 	return err;
 }
 

lib/Kconfig.kasan

@@ -15,8 +15,7 @@ config KASAN
 	  global variables requires gcc 5.0 or later.
 	  This feature consumes about 1/8 of available memory and brings about
 	  ~x3 performance slowdown.
-	  For better error detection enable CONFIG_STACKTRACE,
-	  and add slub_debug=U to boot cmdline.
+	  For better error detection enable CONFIG_STACKTRACE.
 
 choice
 	prompt "Instrumentation type"

lib/test_kasan.c

@@ -138,6 +138,71 @@ static noinline void __init kmalloc_oob_16(void)
 	kfree(ptr2);
 }
 
+static noinline void __init kmalloc_oob_memset_2(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset2\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+7, 0, 2);
+	kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_memset_4(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset4\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+5, 0, 4);
+	kfree(ptr);
+}
+
+
+static noinline void __init kmalloc_oob_memset_8(void)
+{
+	char *ptr;
+	size_t size = 8;
+
+	pr_info("out-of-bounds in memset8\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+1, 0, 8);
+	kfree(ptr);
+}
+
+static noinline void __init kmalloc_oob_memset_16(void)
+{
+	char *ptr;
+	size_t size = 16;
+
+	pr_info("out-of-bounds in memset16\n");
+	ptr = kmalloc(size, GFP_KERNEL);
+	if (!ptr) {
+		pr_err("Allocation failed\n");
+		return;
+	}
+
+	memset(ptr+1, 0, 16);
+	kfree(ptr);
+}
+
 static noinline void __init kmalloc_oob_in_memset(void)
 {
 	char *ptr;
@@ -264,6 +329,10 @@ static int __init kmalloc_tests_init(void)
 	kmalloc_oob_krealloc_less();
 	kmalloc_oob_16();
 	kmalloc_oob_in_memset();
+	kmalloc_oob_memset_2();
+	kmalloc_oob_memset_4();
+	kmalloc_oob_memset_8();
+	kmalloc_oob_memset_16();
 	kmalloc_uaf();
 	kmalloc_uaf_memset();
 	kmalloc_uaf2();

mm/balloon_compaction.c

@@ -199,23 +199,17 @@ int balloon_page_migrate(struct page *newpage,
 	struct balloon_dev_info *balloon = balloon_page_device(page);
 	int rc = -EAGAIN;
 
-	/*
-	 * Block others from accessing the 'newpage' when we get around to
-	 * establishing additional references. We should be the only one
-	 * holding a reference to the 'newpage' at this point.
-	 */
-	BUG_ON(!trylock_page(newpage));
+	VM_BUG_ON_PAGE(!PageLocked(page), page);
+	VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
 
 	if (WARN_ON(!__is_movable_balloon_page(page))) {
 		dump_page(page, "not movable balloon page");
-		unlock_page(newpage);
 		return rc;
 	}
 
 	if (balloon && balloon->migratepage)
 		rc = balloon->migratepage(balloon, newpage, page, mode);
 
-	unlock_page(newpage);
 	return rc;
 }
 #endif /* CONFIG_BALLOON_COMPACTION */

mm/cma.c

@@ -363,7 +363,9 @@ err:
  */
 struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align)
 {
-	unsigned long mask, offset, pfn, start = 0;
+	unsigned long mask, offset;
+	unsigned long pfn = -1;
+	unsigned long start = 0;
 	unsigned long bitmap_maxno, bitmap_no, bitmap_count;
 	struct page *page = NULL;
 	int ret;
@@ -418,7 +420,7 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align)
 		start = bitmap_no + mask + 1;
 	}
 
-	trace_cma_alloc(page ? pfn : -1UL, page, count, align);
+	trace_cma_alloc(pfn, page, count, align);
 
 	pr_debug("%s(): returned %p\n", __func__, page);
 	return page;

mm/compaction.c

@@ -35,17 +35,6 @@ static inline void count_compact_events(enum vm_event_item item, long delta)
 #endif
 
 #if defined CONFIG_COMPACTION || defined CONFIG_CMA
-#ifdef CONFIG_TRACEPOINTS
-static const char *const compaction_status_string[] = {
-	"deferred",
-	"skipped",
-	"continue",
-	"partial",
-	"complete",
-	"no_suitable_page",
-	"not_suitable_zone",
-};
-#endif
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/compaction.h>
@@ -1197,6 +1186,15 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
 	return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE;
 }
 
+/*
+ * order == -1 is expected when compacting via
+ * /proc/sys/vm/compact_memory
+ */
+static inline bool is_via_compact_memory(int order)
+{
+	return order == -1;
+}
+
 static int __compact_finished(struct zone *zone, struct compact_control *cc,
 			    const int migratetype)
 {
@@ -1204,7 +1202,7 @@ static int __compact_finished(struct zone *zone, struct compact_control *cc,
 	unsigned long watermark;
 
 	if (cc->contended || fatal_signal_pending(current))
-		return COMPACT_PARTIAL;
+		return COMPACT_CONTENDED;
 
 	/* Compaction run completes if the migrate and free scanner meet */
 	if (compact_scanners_met(cc)) {
@@ -1223,11 +1221,7 @@ static int __compact_finished(struct zone *zone, struct compact_control *cc,
 		return COMPACT_COMPLETE;
 	}
 
-	/*
-	 * order == -1 is expected when compacting via
-	 * /proc/sys/vm/compact_memory
-	 */
-	if (cc->order == -1)
+	if (is_via_compact_memory(cc->order))
 		return COMPACT_CONTINUE;
 
 	/* Compaction run is not finished if the watermark is not met */
@@ -1290,11 +1284,7 @@ static unsigned long __compaction_suitable(struct zone *zone, int order,
 	int fragindex;
 	unsigned long watermark;
 
-	/*
-	 * order == -1 is expected when compacting via
-	 * /proc/sys/vm/compact_memory
-	 */
-	if (order == -1)
+	if (is_via_compact_memory(order))
 		return COMPACT_CONTINUE;
 
 	watermark = low_wmark_pages(zone);
@@ -1403,7 +1393,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
 
 		switch (isolate_migratepages(zone, cc)) {
 		case ISOLATE_ABORT:
-			ret = COMPACT_PARTIAL;
+			ret = COMPACT_CONTENDED;
 			putback_movable_pages(&cc->migratepages);
 			cc->nr_migratepages = 0;
 			goto out;
@@ -1434,7 +1424,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
 			 * and we want compact_finished() to detect it
 			 */
 			if (err == -ENOMEM && !compact_scanners_met(cc)) {
-				ret = COMPACT_PARTIAL;
+				ret = COMPACT_CONTENDED;
 				goto out;
 			}
 		}
@@ -1487,6 +1477,9 @@ out:
 	trace_mm_compaction_end(start_pfn, cc->migrate_pfn,
 				cc->free_pfn, end_pfn, sync, ret);
 
+	if (ret == COMPACT_CONTENDED)
+		ret = COMPACT_PARTIAL;
+
 	return ret;
 }
 
@@ -1658,10 +1651,11 @@ static void __compact_pgdat(pg_data_t *pgdat, struct compact_control *cc)
 		 * this makes sure we compact the whole zone regardless of
 		 * cached scanner positions.
 		 */
-		if (cc->order == -1)
+		if (is_via_compact_memory(cc->order))
 			__reset_isolation_suitable(zone);
 
-		if (cc->order == -1 || !compaction_deferred(zone, cc->order))
+		if (is_via_compact_memory(cc->order) ||
+				!compaction_deferred(zone, cc->order))
 			compact_zone(zone, cc);
 
 		if (cc->order > 0) {

mm/debug.c

@@ -125,6 +125,7 @@ static const struct trace_print_flags vmaflags_names[] = {
 	{VM_GROWSDOWN,			"growsdown"	},
 	{VM_PFNMAP,			"pfnmap"	},
 	{VM_DENYWRITE,			"denywrite"	},
+	{VM_LOCKONFAULT,		"lockonfault"	},
 	{VM_LOCKED,			"locked"	},
 	{VM_IO,				"io"		},
 	{VM_SEQ_READ,			"seqread"	},

mm/early_ioremap.c

@@ -126,7 +126,7 @@ __early_ioremap(resource_size_t phys_addr, unsigned long size, pgprot_t prot)
 	/*
 	 * Mappings have to be page-aligned
 	 */
-	offset = phys_addr & ~PAGE_MASK;
+	offset = offset_in_page(phys_addr);
 	phys_addr &= PAGE_MASK;
 	size = PAGE_ALIGN(last_addr + 1) - phys_addr;
 
@@ -189,7 +189,7 @@ void __init early_iounmap(void __iomem *addr, unsigned long size)
 	if (WARN_ON(virt_addr < fix_to_virt(FIX_BTMAP_BEGIN)))
 		return;
 
-	offset = virt_addr & ~PAGE_MASK;
+	offset = offset_in_page(virt_addr);
 	nrpages = PAGE_ALIGN(offset + size) >> PAGE_SHIFT;
 
 	idx = FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*slot;
@@ -234,7 +234,7 @@ void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size)
 	char *p;
 
 	while (size) {
-		slop = src & ~PAGE_MASK;
+		slop = offset_in_page(src);
 		clen = size;
 		if (clen > MAX_MAP_CHUNK - slop)
 			clen = MAX_MAP_CHUNK - slop;

mm/filemap.c

@@ -331,23 +331,14 @@ int filemap_flush(struct address_space *mapping)
 }
 EXPORT_SYMBOL(filemap_flush);
 
-/**
- * filemap_fdatawait_range - wait for writeback to complete
- * @mapping:		address space structure to wait for
- * @start_byte:		offset in bytes where the range starts
- * @end_byte:		offset in bytes where the range ends (inclusive)
- *
- * Walk the list of under-writeback pages of the given address space
- * in the given range and wait for all of them.
- */
-int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
-			    loff_t end_byte)
+static int __filemap_fdatawait_range(struct address_space *mapping,
+				     loff_t start_byte, loff_t end_byte)
 {
 	pgoff_t index = start_byte >> PAGE_CACHE_SHIFT;
 	pgoff_t end = end_byte >> PAGE_CACHE_SHIFT;
 	struct pagevec pvec;
 	int nr_pages;
-	int ret2, ret = 0;
+	int ret = 0;
 
 	if (end_byte < start_byte)
 		goto out;
@@ -374,6 +365,29 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
 		cond_resched();
 	}
 out:
+	return ret;
+}
+
+/**
+ * filemap_fdatawait_range - wait for writeback to complete
+ * @mapping:		address space structure to wait for
+ * @start_byte:		offset in bytes where the range starts
+ * @end_byte:		offset in bytes where the range ends (inclusive)
+ *
+ * Walk the list of under-writeback pages of the given address space
+ * in the given range and wait for all of them.  Check error status of
+ * the address space and return it.
+ *
+ * Since the error status of the address space is cleared by this function,
+ * callers are responsible for checking the return value and handling and/or
+ * reporting the error.
+ */
+int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
+			    loff_t end_byte)
+{
+	int ret, ret2;
+
+	ret = __filemap_fdatawait_range(mapping, start_byte, end_byte);
 	ret2 = filemap_check_errors(mapping);
 	if (!ret)
 		ret = ret2;
@@ -382,12 +396,39 @@ out:
 }
 EXPORT_SYMBOL(filemap_fdatawait_range);
 
+/**
+ * filemap_fdatawait_keep_errors - wait for writeback without clearing errors
+ * @mapping: address space structure to wait for
+ *
+ * Walk the list of under-writeback pages of the given address space
+ * and wait for all of them.  Unlike filemap_fdatawait(), this function
+ * does not clear error status of the address space.
+ *
+ * Use this function if callers don't handle errors themselves.  Expected
+ * call sites are system-wide / filesystem-wide data flushers: e.g. sync(2),
+ * fsfreeze(8)
+ */
+void filemap_fdatawait_keep_errors(struct address_space *mapping)
+{
+	loff_t i_size = i_size_read(mapping->host);
+
+	if (i_size == 0)
+		return;
+
+	__filemap_fdatawait_range(mapping, 0, i_size - 1);
+}
+
 /**
  * filemap_fdatawait - wait for all under-writeback pages to complete
  * @mapping: address space structure to wait for
  *
  * Walk the list of under-writeback pages of the given address space
- * and wait for all of them.
+ * and wait for all of them.  Check error status of the address space
+ * and return it.
+ *
+ * Since the error status of the address space is cleared by this function,
+ * callers are responsible for checking the return value and handling and/or
+ * reporting the error.
  */
 int filemap_fdatawait(struct address_space *mapping)
 {
@@ -510,7 +551,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
 			__inc_zone_page_state(new, NR_SHMEM);
 		spin_unlock_irqrestore(&mapping->tree_lock, flags);
 		mem_cgroup_end_page_stat(memcg);
-		mem_cgroup_migrate(old, new, true);
+		mem_cgroup_replace_page(old, new);
 		radix_tree_preload_end();
 		if (freepage)
 			freepage(old);
@@ -1807,7 +1848,6 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 				   struct file *file,
 				   pgoff_t offset)
 {
-	unsigned long ra_pages;
 	struct address_space *mapping = file->f_mapping;
 
 	/* If we don't want any read-ahead, don't bother */
@@ -1836,10 +1876,9 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 	/*
 	 * mmap read-around
 	 */
-	ra_pages = max_sane_readahead(ra->ra_pages);
-	ra->start = max_t(long, 0, offset - ra_pages / 2);
-	ra->size = ra_pages;
-	ra->async_size = ra_pages / 4;
+	ra->start = max_t(long, 0, offset - ra->ra_pages / 2);
+	ra->size = ra->ra_pages;
+	ra->async_size = ra->ra_pages / 4;
 	ra_submit(ra, mapping, file);
 }
 

mm/frame_vector.c

@@ -7,7 +7,7 @@
 #include <linux/pagemap.h>
 #include <linux/sched.h>
 
-/*
+/**
  * get_vaddr_frames() - map virtual addresses to pfns
  * @start:	starting user address
  * @nr_frames:	number of pages / pfns from start to map

mm/gup.c

@@ -129,7 +129,7 @@ retry:
 		 */
 		mark_page_accessed(page);
 	}
-	if ((flags & FOLL_POPULATE) && (vma->vm_flags & VM_LOCKED)) {
+	if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
 		/*
 		 * The preliminary mapping check is mainly to avoid the
 		 * pointless overhead of lock_page on the ZERO_PAGE
@@ -299,6 +299,9 @@ static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma,
 	unsigned int fault_flags = 0;
 	int ret;
 
+	/* mlock all present pages, but do not fault in new pages */
+	if ((*flags & (FOLL_POPULATE | FOLL_MLOCK)) == FOLL_MLOCK)
+		return -ENOENT;
 	/* For mm_populate(), just skip the stack guard page. */
 	if ((*flags & FOLL_POPULATE) &&
 			(stack_guard_page_start(vma, address) ||
@@ -890,7 +893,10 @@ long populate_vma_page_range(struct vm_area_struct *vma,
 	VM_BUG_ON_VMA(end   > vma->vm_end, vma);
 	VM_BUG_ON_MM(!rwsem_is_locked(&mm->mmap_sem), mm);
 
-	gup_flags = FOLL_TOUCH | FOLL_POPULATE;
+	gup_flags = FOLL_TOUCH | FOLL_POPULATE | FOLL_MLOCK;
+	if (vma->vm_flags & VM_LOCKONFAULT)
+		gup_flags &= ~FOLL_POPULATE;
+
 	/*
 	 * We want to touch writable mappings with a write fault in order
 	 * to break COW, except for shared mappings because these don't COW

mm/huge_memory.c

@@ -1307,7 +1307,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma,
 					  pmd, _pmd,  1))
 			update_mmu_cache_pmd(vma, addr, pmd);
 	}
-	if ((flags & FOLL_POPULATE) && (vma->vm_flags & VM_LOCKED)) {
+	if ((flags & FOLL_MLOCK) && (vma->vm_flags & VM_LOCKED)) {
 		if (page->mapping && trylock_page(page)) {
 			lru_add_drain();
 			if (page->mapping)

mm/hugetlb.c

@@ -1437,7 +1437,82 @@ void dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
 		dissolve_free_huge_page(pfn_to_page(pfn));
 }
 
-static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
+/*
+ * There are 3 ways this can get called:
+ * 1. With vma+addr: we use the VMA's memory policy
+ * 2. With !vma, but nid=NUMA_NO_NODE:  We try to allocate a huge
+ *    page from any node, and let the buddy allocator itself figure
+ *    it out.
+ * 3. With !vma, but nid!=NUMA_NO_NODE.  We allocate a huge page
+ *    strictly from 'nid'
+ */
+static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h,
+		struct vm_area_struct *vma, unsigned long addr, int nid)
+{
+	int order = huge_page_order(h);
+	gfp_t gfp = htlb_alloc_mask(h)|__GFP_COMP|__GFP_REPEAT|__GFP_NOWARN;
+	unsigned int cpuset_mems_cookie;
+
+	/*
+	 * We need a VMA to get a memory policy.  If we do not
+	 * have one, we use the 'nid' argument.
+	 *
+	 * The mempolicy stuff below has some non-inlined bits
+	 * and calls ->vm_ops.  That makes it hard to optimize at
+	 * compile-time, even when NUMA is off and it does
+	 * nothing.  This helps the compiler optimize it out.
+	 */
+	if (!IS_ENABLED(CONFIG_NUMA) || !vma) {
+		/*
+		 * If a specific node is requested, make sure to
+		 * get memory from there, but only when a node
+		 * is explicitly specified.
+		 */
+		if (nid != NUMA_NO_NODE)
+			gfp |= __GFP_THISNODE;
+		/*
+		 * Make sure to call something that can handle
+		 * nid=NUMA_NO_NODE
+		 */
+		return alloc_pages_node(nid, gfp, order);
+	}
+
+	/*
+	 * OK, so we have a VMA.  Fetch the mempolicy and try to
+	 * allocate a huge page with it.  We will only reach this
+	 * when CONFIG_NUMA=y.
+	 */
+	do {
+		struct page *page;
+		struct mempolicy *mpol;
+		struct zonelist *zl;
+		nodemask_t *nodemask;
+
+		cpuset_mems_cookie = read_mems_allowed_begin();
+		zl = huge_zonelist(vma, addr, gfp, &mpol, &nodemask);
+		mpol_cond_put(mpol);
+		page = __alloc_pages_nodemask(gfp, order, zl, nodemask);
+		if (page)
+			return page;
+	} while (read_mems_allowed_retry(cpuset_mems_cookie));
+
+	return NULL;
+}
+
+/*
+ * There are two ways to allocate a huge page:
+ * 1. When you have a VMA and an address (like a fault)
+ * 2. When you have no VMA (like when setting /proc/.../nr_hugepages)
+ *
+ * 'vma' and 'addr' are only for (1).  'nid' is always NUMA_NO_NODE in
+ * this case which signifies that the allocation should be done with
+ * respect for the VMA's memory policy.
+ *
+ * For (2), we ignore 'vma' and 'addr' and use 'nid' exclusively. This
+ * implies that memory policies will not be taken in to account.
+ */
+static struct page *__alloc_buddy_huge_page(struct hstate *h,
+		struct vm_area_struct *vma, unsigned long addr, int nid)
 {
 	struct page *page;
 	unsigned int r_nid;
@@ -1445,6 +1520,15 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
 	if (hstate_is_gigantic(h))
 		return NULL;
 
+	/*
+	 * Make sure that anyone specifying 'nid' is not also specifying a VMA.
+	 * This makes sure the caller is picking _one_ of the modes with which
+	 * we can call this function, not both.
+	 */
+	if (vma || (addr != -1)) {
+		VM_WARN_ON_ONCE(addr == -1);
+		VM_WARN_ON_ONCE(nid != NUMA_NO_NODE);
+	}
 	/*
 	 * Assume we will successfully allocate the surplus page to
 	 * prevent racing processes from causing the surplus to exceed
@@ -1478,14 +1562,7 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
 	}
 	spin_unlock(&hugetlb_lock);
 
-	if (nid == NUMA_NO_NODE)
-		page = alloc_pages(htlb_alloc_mask(h)|__GFP_COMP|
-				   __GFP_REPEAT|__GFP_NOWARN,
-				   huge_page_order(h));
-	else
-		page = __alloc_pages_node(nid,
-			htlb_alloc_mask(h)|__GFP_COMP|__GFP_THISNODE|
-			__GFP_REPEAT|__GFP_NOWARN, huge_page_order(h));
+	page = __hugetlb_alloc_buddy_huge_page(h, vma, addr, nid);
 
 	spin_lock(&hugetlb_lock);
 	if (page) {
@@ -1509,6 +1586,29 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
 	return page;
 }
 
+/*
+ * Allocate a huge page from 'nid'.  Note, 'nid' may be
+ * NUMA_NO_NODE, which means that it may be allocated
+ * anywhere.
+ */
+static
+struct page *__alloc_buddy_huge_page_no_mpol(struct hstate *h, int nid)
+{
+	unsigned long addr = -1;
+
+	return __alloc_buddy_huge_page(h, NULL, addr, nid);
+}
+
+/*
+ * Use the VMA's mpolicy to allocate a huge page from the buddy.
+ */
+static
+struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h,
+		struct vm_area_struct *vma, unsigned long addr)
+{
+	return __alloc_buddy_huge_page(h, vma, addr, NUMA_NO_NODE);
+}
+
 /*
  * This allocation function is useful in the context where vma is irrelevant.
  * E.g. soft-offlining uses this function because it only cares physical
@@ -1524,7 +1624,7 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
 	spin_unlock(&hugetlb_lock);
 
 	if (!page)
-		page = alloc_buddy_huge_page(h, nid);
+		page = __alloc_buddy_huge_page_no_mpol(h, nid);
 
 	return page;
 }
@@ -1554,7 +1654,7 @@ static int gather_surplus_pages(struct hstate *h, int delta)
 retry:
 	spin_unlock(&hugetlb_lock);
 	for (i = 0; i < needed; i++) {
-		page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
+		page = __alloc_buddy_huge_page_no_mpol(h, NUMA_NO_NODE);
 		if (!page) {
 			alloc_ok = false;
 			break;
@@ -1787,7 +1887,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
 	page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve, gbl_chg);
 	if (!page) {
 		spin_unlock(&hugetlb_lock);
-		page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
+		page = __alloc_buddy_huge_page_with_mpol(h, vma, addr);
 		if (!page)
 			goto out_uncharge_cgroup;
 
@@ -2376,7 +2476,7 @@ struct node_hstate {
 	struct kobject		*hugepages_kobj;
 	struct kobject		*hstate_kobjs[HUGE_MAX_HSTATE];
 };
-struct node_hstate node_hstates[MAX_NUMNODES];
+static struct node_hstate node_hstates[MAX_NUMNODES];
 
 /*
  * A subset of global hstate attributes for node devices
@@ -2790,6 +2890,12 @@ void hugetlb_show_meminfo(void)
 				1UL << (huge_page_order(h) + PAGE_SHIFT - 10));
 }
 
+void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm)
+{
+	seq_printf(m, "HugetlbPages:\t%8lu kB\n",
+		   atomic_long_read(&mm->hugetlb_usage) << (PAGE_SHIFT - 10));
+}
+
 /* Return the number pages of memory we physically have, in PAGE_SIZE units. */
 unsigned long hugetlb_total_pages(void)
 {
@@ -3025,6 +3131,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
 			get_page(ptepage);
 			page_dup_rmap(ptepage);
 			set_huge_pte_at(dst, addr, dst_pte, entry);
+			hugetlb_count_add(pages_per_huge_page(h), dst);
 		}
 		spin_unlock(src_ptl);
 		spin_unlock(dst_ptl);
@@ -3105,6 +3212,7 @@ again:
 		if (huge_pte_dirty(pte))
 			set_page_dirty(page);
 
+		hugetlb_count_sub(pages_per_huge_page(h), mm);
 		page_remove_rmap(page);
 		force_flush = !__tlb_remove_page(tlb, page);
 		if (force_flush) {
@@ -3509,6 +3617,7 @@ retry:
 				&& (vma->vm_flags & VM_SHARED)));
 	set_huge_pte_at(mm, address, ptep, new_pte);
 
+	hugetlb_count_add(pages_per_huge_page(h), mm);
 	if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) {
 		/* Optimization, do the COW without a second fault */
 		ret = hugetlb_cow(mm, vma, address, ptep, new_pte, page, ptl);
@@ -4028,8 +4137,8 @@ static unsigned long page_table_shareable(struct vm_area_struct *svma,
 	unsigned long s_end = sbase + PUD_SIZE;
 
 	/* Allow segments to share if only one is marked locked */
-	unsigned long vm_flags = vma->vm_flags & ~VM_LOCKED;
-	unsigned long svm_flags = svma->vm_flags & ~VM_LOCKED;
+	unsigned long vm_flags = vma->vm_flags & VM_LOCKED_CLEAR_MASK;
+	unsigned long svm_flags = svma->vm_flags & VM_LOCKED_CLEAR_MASK;
 
 	/*
 	 * match the virtual addresses, permission and the alignment of the

mm/hugetlb_cgroup.c

@@ -186,7 +186,8 @@ again:
 	}
 	rcu_read_unlock();
 
-	ret = page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter);
+	if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter))
+		ret = -ENOMEM;
 	css_put(&h_cg->css);
 done:
 	*ptr = h_cg;

mm/internal.h

@@ -271,20 +271,19 @@ extern unsigned int munlock_vma_page(struct page *page);
 extern void clear_page_mlock(struct page *page);
 
 /*
- * mlock_migrate_page - called only from migrate_page_copy() to
- * migrate the Mlocked page flag; update statistics.
+ * mlock_migrate_page - called only from migrate_misplaced_transhuge_page()
+ * (because that does not go through the full procedure of migration ptes):
+ * to migrate the Mlocked page flag; update statistics.
  */
 static inline void mlock_migrate_page(struct page *newpage, struct page *page)
 {
 	if (TestClearPageMlocked(page)) {
-		unsigned long flags;
 		int nr_pages = hpage_nr_pages(page);
 
-		local_irq_save(flags);
+		/* Holding pmd lock, no change in irq context: __mod is safe */
 		__mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
 		SetPageMlocked(newpage);
 		__mod_zone_page_state(page_zone(newpage), NR_MLOCK, nr_pages);
-		local_irq_restore(flags);
 	}
 }
 

mm/kasan/kasan.c

@@ -4,7 +4,7 @@
  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
  * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
  *
- * Some of code borrowed from https://github.com/xairy/linux by
+ * Some code borrowed from https://github.com/xairy/kasan-prototype by
  *        Andrey Konovalov <adech.fo@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -86,6 +86,11 @@ static __always_inline bool memory_is_poisoned_2(unsigned long addr)
 		if (memory_is_poisoned_1(addr + 1))
 			return true;
 
+		/*
+		 * If single shadow byte covers 2-byte access, we don't
+		 * need to do anything more. Otherwise, test the first
+		 * shadow byte.
+		 */
 		if (likely(((addr + 1) & KASAN_SHADOW_MASK) != 0))
 			return false;
 
@@ -103,6 +108,11 @@ static __always_inline bool memory_is_poisoned_4(unsigned long addr)
 		if (memory_is_poisoned_1(addr + 3))
 			return true;
 
+		/*
+		 * If single shadow byte covers 4-byte access, we don't
+		 * need to do anything more. Otherwise, test the first
+		 * shadow byte.
+		 */
 		if (likely(((addr + 3) & KASAN_SHADOW_MASK) >= 3))
 			return false;
 
@@ -120,7 +130,12 @@ static __always_inline bool memory_is_poisoned_8(unsigned long addr)
 		if (memory_is_poisoned_1(addr + 7))
 			return true;
 
-		if (likely(((addr + 7) & KASAN_SHADOW_MASK) >= 7))
+		/*
+		 * If single shadow byte covers 8-byte access, we don't
+		 * need to do anything more. Otherwise, test the first
+		 * shadow byte.
+		 */
+		if (likely(IS_ALIGNED(addr, KASAN_SHADOW_SCALE_SIZE)))
 			return false;
 
 		return unlikely(*(u8 *)shadow_addr);
@@ -139,7 +154,12 @@ static __always_inline bool memory_is_poisoned_16(unsigned long addr)
 		if (unlikely(shadow_first_bytes))
 			return true;
 
-		if (likely(IS_ALIGNED(addr, 8)))
+		/*
+		 * If two shadow bytes covers 16-byte access, we don't
+		 * need to do anything more. Otherwise, test the last
+		 * shadow byte.
+		 */
+		if (likely(IS_ALIGNED(addr, KASAN_SHADOW_SCALE_SIZE)))
 			return false;
 
 		return memory_is_poisoned_1(addr + 15);
@@ -203,7 +223,7 @@ static __always_inline bool memory_is_poisoned_n(unsigned long addr,
 		s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte);
 
 		if (unlikely(ret != (unsigned long)last_shadow ||
-			((last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
+			((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
 			return true;
 	}
 	return false;
@@ -235,18 +255,12 @@ static __always_inline bool memory_is_poisoned(unsigned long addr, size_t size)
 static __always_inline void check_memory_region(unsigned long addr,
 						size_t size, bool write)
 {
-	struct kasan_access_info info;
-
 	if (unlikely(size == 0))
 		return;
 
 	if (unlikely((void *)addr <
 		kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
-		info.access_addr = (void *)addr;
-		info.access_size = size;
-		info.is_write = write;
-		info.ip = _RET_IP_;
-		kasan_report_user_access(&info);
+		kasan_report(addr, size, write, _RET_IP_);
 		return;
 	}
 
@@ -524,7 +538,7 @@ static int kasan_mem_notifier(struct notifier_block *nb,
 
 static int __init kasan_memhotplug_init(void)
 {
-	pr_err("WARNING: KASan doesn't support memory hot-add\n");
+	pr_err("WARNING: KASAN doesn't support memory hot-add\n");
 	pr_err("Memory hot-add will be disabled\n");
 
 	hotplug_memory_notifier(kasan_mem_notifier, 0);

mm/kasan/kasan.h

@@ -54,16 +54,13 @@ struct kasan_global {
 #endif
 };
 
-void kasan_report_error(struct kasan_access_info *info);
-void kasan_report_user_access(struct kasan_access_info *info);
-
 static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
 {
 	return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
 		<< KASAN_SHADOW_SCALE_SHIFT);
 }
 
-static inline bool kasan_enabled(void)
+static inline bool kasan_report_enabled(void)
 {
 	return !current->kasan_depth;
 }

mm/kasan/report.c

@@ -4,7 +4,7 @@
  * Copyright (c) 2014 Samsung Electronics Co., Ltd.
  * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
  *
- * Some of code borrowed from https://github.com/xairy/linux by
+ * Some code borrowed from https://github.com/xairy/kasan-prototype by
  *        Andrey Konovalov <adech.fo@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -22,6 +22,7 @@
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/kasan.h>
+#include <linux/module.h>
 
 #include <asm/sections.h>
 
@@ -48,34 +49,49 @@ static const void *find_first_bad_addr(const void *addr, size_t size)
 
 static void print_error_description(struct kasan_access_info *info)
 {
-	const char *bug_type = "unknown crash";
-	u8 shadow_val;
+	const char *bug_type = "unknown-crash";
+	u8 *shadow_addr;
 
 	info->first_bad_addr = find_first_bad_addr(info->access_addr,
 						info->access_size);
 
-	shadow_val = *(u8 *)kasan_mem_to_shadow(info->first_bad_addr);
+	shadow_addr = (u8 *)kasan_mem_to_shadow(info->first_bad_addr);
 
-	switch (shadow_val) {
-	case KASAN_FREE_PAGE:
-	case KASAN_KMALLOC_FREE:
-		bug_type = "use after free";
+	/*
+	 * If shadow byte value is in [0, KASAN_SHADOW_SCALE_SIZE) we can look
+	 * at the next shadow byte to determine the type of the bad access.
+	 */
+	if (*shadow_addr > 0 && *shadow_addr <= KASAN_SHADOW_SCALE_SIZE - 1)
+		shadow_addr++;
+
+	switch (*shadow_addr) {
+	case 0 ... KASAN_SHADOW_SCALE_SIZE - 1:
+		/*
+		 * In theory it's still possible to see these shadow values
+		 * due to a data race in the kernel code.
+		 */
+		bug_type = "out-of-bounds";
 		break;
 	case KASAN_PAGE_REDZONE:
 	case KASAN_KMALLOC_REDZONE:
+		bug_type = "slab-out-of-bounds";
+		break;
 	case KASAN_GLOBAL_REDZONE:
-	case 0 ... KASAN_SHADOW_SCALE_SIZE - 1:
-		bug_type = "out of bounds access";
+		bug_type = "global-out-of-bounds";
 		break;
 	case KASAN_STACK_LEFT:
 	case KASAN_STACK_MID:
 	case KASAN_STACK_RIGHT:
 	case KASAN_STACK_PARTIAL:
-		bug_type = "out of bounds on stack";
+		bug_type = "stack-out-of-bounds";
+		break;
+	case KASAN_FREE_PAGE:
+	case KASAN_KMALLOC_FREE:
+		bug_type = "use-after-free";
 		break;
 	}
 
-	pr_err("BUG: KASan: %s in %pS at addr %p\n",
+	pr_err("BUG: KASAN: %s in %pS at addr %p\n",
 		bug_type, (void *)info->ip,
 		info->access_addr);
 	pr_err("%s of size %zu by task %s/%d\n",
@@ -85,9 +101,11 @@ static void print_error_description(struct kasan_access_info *info)
 
 static inline bool kernel_or_module_addr(const void *addr)
 {
-	return (addr >= (void *)_stext && addr < (void *)_end)
-		|| (addr >= (void *)MODULES_VADDR
-			&& addr < (void *)MODULES_END);
+	if (addr >= (void *)_stext && addr < (void *)_end)
+		return true;
+	if (is_module_address((unsigned long)addr))
+		return true;
+	return false;
 }
 
 static inline bool init_task_stack_addr(const void *addr)
@@ -161,15 +179,19 @@ static void print_shadow_for_address(const void *addr)
 	for (i = -SHADOW_ROWS_AROUND_ADDR; i <= SHADOW_ROWS_AROUND_ADDR; i++) {
 		const void *kaddr = kasan_shadow_to_mem(shadow_row);
 		char buffer[4 + (BITS_PER_LONG/8)*2];
+		char shadow_buf[SHADOW_BYTES_PER_ROW];
 
 		snprintf(buffer, sizeof(buffer),
 			(i == 0) ? ">%p: " : " %p: ", kaddr);
-
-		kasan_disable_current();
+		/*
+		 * We should not pass a shadow pointer to generic
+		 * function, because generic functions may try to
+		 * access kasan mapping for the passed address.
+		 */
+		memcpy(shadow_buf, shadow_row, SHADOW_BYTES_PER_ROW);
 		print_hex_dump(KERN_ERR, buffer,
 			DUMP_PREFIX_NONE, SHADOW_BYTES_PER_ROW, 1,
-			shadow_row, SHADOW_BYTES_PER_ROW, 0);
-		kasan_enable_current();
+			shadow_buf, SHADOW_BYTES_PER_ROW, 0);
 
 		if (row_is_guilty(shadow_row, shadow))
 			pr_err("%*c\n",
@@ -182,37 +204,43 @@ static void print_shadow_for_address(const void *addr)
 
 static DEFINE_SPINLOCK(report_lock);
 
-void kasan_report_error(struct kasan_access_info *info)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&report_lock, flags);
-	pr_err("================================="
-		"=================================\n");
-	print_error_description(info);
-	print_address_description(info);
-	print_shadow_for_address(info->first_bad_addr);
-	pr_err("================================="
-		"=================================\n");
-	spin_unlock_irqrestore(&report_lock, flags);
-}
-
-void kasan_report_user_access(struct kasan_access_info *info)
+static void kasan_report_error(struct kasan_access_info *info)
 {
 	unsigned long flags;
+	const char *bug_type;
 
+	/*
+	 * Make sure we don't end up in loop.
+	 */
+	kasan_disable_current();
 	spin_lock_irqsave(&report_lock, flags);
 	pr_err("================================="
 		"=================================\n");
-	pr_err("BUG: KASan: user-memory-access on address %p\n",
-		info->access_addr);
-	pr_err("%s of size %zu by task %s/%d\n",
-		info->is_write ? "Write" : "Read",
-		info->access_size, current->comm, task_pid_nr(current));
-	dump_stack();
+	if (info->access_addr <
+			kasan_shadow_to_mem((void *)KASAN_SHADOW_START)) {
+		if ((unsigned long)info->access_addr < PAGE_SIZE)
+			bug_type = "null-ptr-deref";
+		else if ((unsigned long)info->access_addr < TASK_SIZE)
+			bug_type = "user-memory-access";
+		else
+			bug_type = "wild-memory-access";
+		pr_err("BUG: KASAN: %s on address %p\n",
+			bug_type, info->access_addr);
+		pr_err("%s of size %zu by task %s/%d\n",
+			info->is_write ? "Write" : "Read",
+			info->access_size, current->comm,
+			task_pid_nr(current));
+		dump_stack();
+	} else {
+		print_error_description(info);
+		print_address_description(info);
+		print_shadow_for_address(info->first_bad_addr);
+	}
 	pr_err("================================="
 		"=================================\n");
+	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);
 	spin_unlock_irqrestore(&report_lock, flags);
+	kasan_enable_current();
 }
 
 void kasan_report(unsigned long addr, size_t size,
@@ -220,13 +248,14 @@ void kasan_report(unsigned long addr, size_t size,
 {
 	struct kasan_access_info info;
 
-	if (likely(!kasan_enabled()))
+	if (likely(!kasan_report_enabled()))
 		return;
 
 	info.access_addr = (void *)addr;
 	info.access_size = size;
 	info.is_write = is_write;
 	info.ip = ip;
+
 	kasan_report_error(&info);
 }
 

mm/kmemleak.c

@@ -479,7 +479,7 @@ static void put_object(struct kmemleak_object *object)
 static struct kmemleak_object *find_and_get_object(unsigned long ptr, int alias)
 {
 	unsigned long flags;
-	struct kmemleak_object *object = NULL;
+	struct kmemleak_object *object;
 
 	rcu_read_lock();
 	read_lock_irqsave(&kmemleak_lock, flags);

mm/ksm.c

@@ -475,7 +475,8 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item)
 		flush_dcache_page(page);
 	} else {
 		put_page(page);
-out:		page = NULL;
+out:
+		page = NULL;
 	}
 	up_read(&mm->mmap_sem);
 	return page;
@@ -625,7 +626,7 @@ static void remove_rmap_item_from_tree(struct rmap_item *rmap_item)
 		unlock_page(page);
 		put_page(page);
 
-		if (stable_node->hlist.first)
+		if (!hlist_empty(&stable_node->hlist))
 			ksm_pages_sharing--;
 		else
 			ksm_pages_shared--;
@@ -1021,8 +1022,6 @@ static int try_to_merge_one_page(struct vm_area_struct *vma,
 	if (page == kpage)			/* ksm page forked */
 		return 0;
 
-	if (!(vma->vm_flags & VM_MERGEABLE))
-		goto out;
 	if (PageTransCompound(page) && page_trans_compound_anon_split(page))
 		goto out;
 	BUG_ON(PageTransCompound(page));
@@ -1087,10 +1086,8 @@ static int try_to_merge_with_ksm_page(struct rmap_item *rmap_item,
 	int err = -EFAULT;
 
 	down_read(&mm->mmap_sem);
-	if (ksm_test_exit(mm))
-		goto out;
-	vma = find_vma(mm, rmap_item->address);
-	if (!vma || vma->vm_start > rmap_item->address)
+	vma = find_mergeable_vma(mm, rmap_item->address);
+	if (!vma)
 		goto out;
 
 	err = try_to_merge_one_page(vma, page, kpage);
@@ -1177,8 +1174,18 @@ again:
 		cond_resched();
 		stable_node = rb_entry(*new, struct stable_node, node);
 		tree_page = get_ksm_page(stable_node, false);
-		if (!tree_page)
-			return NULL;
+		if (!tree_page) {
+			/*
+			 * If we walked over a stale stable_node,
+			 * get_ksm_page() will call rb_erase() and it
+			 * may rebalance the tree from under us. So
+			 * restart the search from scratch. Returning
+			 * NULL would be safe too, but we'd generate
+			 * false negative insertions just because some
+			 * stable_node was stale.
+			 */
+			goto again;
+		}
 
 		ret = memcmp_pages(page, tree_page);
 		put_page(tree_page);
@@ -1254,12 +1261,14 @@ static struct stable_node *stable_tree_insert(struct page *kpage)
 	unsigned long kpfn;
 	struct rb_root *root;
 	struct rb_node **new;
-	struct rb_node *parent = NULL;
+	struct rb_node *parent;
 	struct stable_node *stable_node;
 
 	kpfn = page_to_pfn(kpage);
 	nid = get_kpfn_nid(kpfn);
 	root = root_stable_tree + nid;
+again:
+	parent = NULL;
 	new = &root->rb_node;
 
 	while (*new) {
@@ -1269,8 +1278,18 @@ static struct stable_node *stable_tree_insert(struct page *kpage)
 		cond_resched();
 		stable_node = rb_entry(*new, struct stable_node, node);
 		tree_page = get_ksm_page(stable_node, false);
-		if (!tree_page)
-			return NULL;
+		if (!tree_page) {
+			/*
+			 * If we walked over a stale stable_node,
+			 * get_ksm_page() will call rb_erase() and it
+			 * may rebalance the tree from under us. So
+			 * restart the search from scratch. Returning
+			 * NULL would be safe too, but we'd generate
+			 * false negative insertions just because some
+			 * stable_node was stale.
+			 */
+			goto again;
+		}
 
 		ret = memcmp_pages(kpage, tree_page);
 		put_page(tree_page);
@@ -1340,7 +1359,7 @@ struct rmap_item *unstable_tree_search_insert(struct rmap_item *rmap_item,
 		cond_resched();
 		tree_rmap_item = rb_entry(*new, struct rmap_item, node);
 		tree_page = get_mergeable_page(tree_rmap_item);
-		if (IS_ERR_OR_NULL(tree_page))
+		if (!tree_page)
 			return NULL;
 
 		/*
@@ -1914,9 +1933,11 @@ again:
 		struct anon_vma_chain *vmac;
 		struct vm_area_struct *vma;
 
+		cond_resched();
 		anon_vma_lock_read(anon_vma);
 		anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
 					       0, ULONG_MAX) {
+			cond_resched();
 			vma = vmac->vma;
 			if (rmap_item->address < vma->vm_start ||
 			    rmap_item->address >= vma->vm_end)

mm/list_lru.c

@@ -42,6 +42,10 @@ static void list_lru_unregister(struct list_lru *lru)
 #ifdef CONFIG_MEMCG_KMEM
 static inline bool list_lru_memcg_aware(struct list_lru *lru)
 {
+	/*
+	 * This needs node 0 to be always present, even
+	 * in the systems supporting sparse numa ids.
+	 */
 	return !!lru->node[0].memcg_lrus;
 }
 
@@ -59,6 +63,16 @@ list_lru_from_memcg_idx(struct list_lru_node *nlru, int idx)
 	return &nlru->lru;
 }
 
+static __always_inline struct mem_cgroup *mem_cgroup_from_kmem(void *ptr)
+{
+	struct page *page;
+
+	if (!memcg_kmem_enabled())
+		return NULL;
+	page = virt_to_head_page(ptr);
+	return page->mem_cgroup;
+}
+
 static inline struct list_lru_one *
 list_lru_from_kmem(struct list_lru_node *nlru, void *ptr)
 {
@@ -377,16 +391,20 @@ static int memcg_init_list_lru(struct list_lru *lru, bool memcg_aware)
 {
 	int i;
 
-	for (i = 0; i < nr_node_ids; i++) {
-		if (!memcg_aware)
-			lru->node[i].memcg_lrus = NULL;
-		else if (memcg_init_list_lru_node(&lru->node[i]))
+	if (!memcg_aware)
+		return 0;
+
+	for_each_node(i) {
+		if (memcg_init_list_lru_node(&lru->node[i]))
 			goto fail;
 	}
 	return 0;
 fail:
-	for (i = i - 1; i >= 0; i--)
+	for (i = i - 1; i >= 0; i--) {
+		if (!lru->node[i].memcg_lrus)
+			continue;
 		memcg_destroy_list_lru_node(&lru->node[i]);
+	}
 	return -ENOMEM;
 }
 
@@ -397,7 +415,7 @@ static void memcg_destroy_list_lru(struct list_lru *lru)
 	if (!list_lru_memcg_aware(lru))
 		return;
 
-	for (i = 0; i < nr_node_ids; i++)
+	for_each_node(i)
 		memcg_destroy_list_lru_node(&lru->node[i]);
 }
 
@@ -409,16 +427,20 @@ static int memcg_update_list_lru(struct list_lru *lru,
 	if (!list_lru_memcg_aware(lru))
 		return 0;
 
-	for (i = 0; i < nr_node_ids; i++) {
+	for_each_node(i) {
 		if (memcg_update_list_lru_node(&lru->node[i],
 					       old_size, new_size))
 			goto fail;
 	}
 	return 0;
 fail:
-	for (i = i - 1; i >= 0; i--)
+	for (i = i - 1; i >= 0; i--) {
+		if (!lru->node[i].memcg_lrus)
+			continue;
+
 		memcg_cancel_update_list_lru_node(&lru->node[i],
 						  old_size, new_size);
+	}
 	return -ENOMEM;
 }
 
@@ -430,7 +452,7 @@ static void memcg_cancel_update_list_lru(struct list_lru *lru,
 	if (!list_lru_memcg_aware(lru))
 		return;
 
-	for (i = 0; i < nr_node_ids; i++)
+	for_each_node(i)
 		memcg_cancel_update_list_lru_node(&lru->node[i],
 						  old_size, new_size);
 }
@@ -485,7 +507,7 @@ static void memcg_drain_list_lru(struct list_lru *lru,
 	if (!list_lru_memcg_aware(lru))
 		return;
 
-	for (i = 0; i < nr_node_ids; i++)
+	for_each_node(i)
 		memcg_drain_list_lru_node(&lru->node[i], src_idx, dst_idx);
 }
 
@@ -522,7 +544,7 @@ int __list_lru_init(struct list_lru *lru, bool memcg_aware,
 	if (!lru->node)
 		goto out;
 
-	for (i = 0; i < nr_node_ids; i++) {
+	for_each_node(i) {
 		spin_lock_init(&lru->node[i].lock);
 		if (key)
 			lockdep_set_class(&lru->node[i].lock, key);

mm/maccess.c

@@ -13,6 +13,11 @@
  *
  * Safely read from address @src to the buffer at @dst.  If a kernel fault
  * happens, handle that and return -EFAULT.
+ *
+ * We ensure that the copy_from_user is executed in atomic context so that
+ * do_page_fault() doesn't attempt to take mmap_sem.  This makes
+ * probe_kernel_read() suitable for use within regions where the caller
+ * already holds mmap_sem, or other locks which nest inside mmap_sem.
  */
 
 long __weak probe_kernel_read(void *dst, const void *src, size_t size)
@@ -99,5 +104,5 @@ long strncpy_from_unsafe(char *dst, const void *unsafe_addr, long count)
 	pagefault_enable();
 	set_fs(old_fs);
 
-	return ret < 0 ? ret : src - unsafe_addr;
+	return ret ? -EFAULT : src - unsafe_addr;
 }

mm/memblock.c

@@ -706,7 +706,7 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
 	return 0;
 }
 
-int __init_memblock memblock_remove_range(struct memblock_type *type,
+static int __init_memblock memblock_remove_range(struct memblock_type *type,
 					  phys_addr_t base, phys_addr_t size)
 {
 	int start_rgn, end_rgn;

mm/memcontrol.c

@@ -62,6 +62,7 @@
 #include <linux/oom.h>
 #include <linux/lockdep.h>
 #include <linux/file.h>
+#include <linux/tracehook.h>
 #include "internal.h"
 #include <net/sock.h>
 #include <net/ip.h>
@@ -1661,7 +1662,7 @@ static void memcg_oom_recover(struct mem_cgroup *memcg)
 
 static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
 {
-	if (!current->memcg_oom.may_oom)
+	if (!current->memcg_may_oom)
 		return;
 	/*
 	 * We are in the middle of the charge context here, so we
@@ -1678,9 +1679,9 @@ static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
 	 * and when we know whether the fault was overall successful.
 	 */
 	css_get(&memcg->css);
-	current->memcg_oom.memcg = memcg;
-	current->memcg_oom.gfp_mask = mask;
-	current->memcg_oom.order = order;
+	current->memcg_in_oom = memcg;
+	current->memcg_oom_gfp_mask = mask;
+	current->memcg_oom_order = order;
 }
 
 /**
@@ -1702,7 +1703,7 @@ static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
  */
 bool mem_cgroup_oom_synchronize(bool handle)
 {
-	struct mem_cgroup *memcg = current->memcg_oom.memcg;
+	struct mem_cgroup *memcg = current->memcg_in_oom;
 	struct oom_wait_info owait;
 	bool locked;
 
@@ -1730,8 +1731,8 @@ bool mem_cgroup_oom_synchronize(bool handle)
 	if (locked && !memcg->oom_kill_disable) {
 		mem_cgroup_unmark_under_oom(memcg);
 		finish_wait(&memcg_oom_waitq, &owait.wait);
-		mem_cgroup_out_of_memory(memcg, current->memcg_oom.gfp_mask,
-					 current->memcg_oom.order);
+		mem_cgroup_out_of_memory(memcg, current->memcg_oom_gfp_mask,
+					 current->memcg_oom_order);
 	} else {
 		schedule();
 		mem_cgroup_unmark_under_oom(memcg);
@@ -1748,7 +1749,7 @@ bool mem_cgroup_oom_synchronize(bool handle)
 		memcg_oom_recover(memcg);
 	}
 cleanup:
-	current->memcg_oom.memcg = NULL;
+	current->memcg_in_oom = NULL;
 	css_put(&memcg->css);
 	return true;
 }
@@ -1972,6 +1973,31 @@ static int memcg_cpu_hotplug_callback(struct notifier_block *nb,
 	return NOTIFY_OK;
 }
 
+/*
+ * Scheduled by try_charge() to be executed from the userland return path
+ * and reclaims memory over the high limit.
+ */
+void mem_cgroup_handle_over_high(void)
+{
+	unsigned int nr_pages = current->memcg_nr_pages_over_high;
+	struct mem_cgroup *memcg, *pos;
+
+	if (likely(!nr_pages))
+		return;
+
+	pos = memcg = get_mem_cgroup_from_mm(current->mm);
+
+	do {
+		if (page_counter_read(&pos->memory) <= pos->high)
+			continue;
+		mem_cgroup_events(pos, MEMCG_HIGH, 1);
+		try_to_free_mem_cgroup_pages(pos, nr_pages, GFP_KERNEL, true);
+	} while ((pos = parent_mem_cgroup(pos)));
+
+	css_put(&memcg->css);
+	current->memcg_nr_pages_over_high = 0;
+}
+
 static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
 		      unsigned int nr_pages)
 {
@@ -1982,17 +2008,16 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
 	unsigned long nr_reclaimed;
 	bool may_swap = true;
 	bool drained = false;
-	int ret = 0;
 
 	if (mem_cgroup_is_root(memcg))
-		goto done;
+		return 0;
 retry:
 	if (consume_stock(memcg, nr_pages))
-		goto done;
+		return 0;
 
 	if (!do_swap_account ||
-	    !page_counter_try_charge(&memcg->memsw, batch, &counter)) {
-		if (!page_counter_try_charge(&memcg->memory, batch, &counter))
+	    page_counter_try_charge(&memcg->memsw, batch, &counter)) {
+		if (page_counter_try_charge(&memcg->memory, batch, &counter))
 			goto done_restock;
 		if (do_swap_account)
 			page_counter_uncharge(&memcg->memsw, batch);
@@ -2016,7 +2041,7 @@ retry:
 	if (unlikely(test_thread_flag(TIF_MEMDIE) ||
 		     fatal_signal_pending(current) ||
 		     current->flags & PF_EXITING))
-		goto bypass;
+		goto force;
 
 	if (unlikely(task_in_memcg_oom(current)))
 		goto nomem;
@@ -2062,38 +2087,54 @@ retry:
 		goto retry;
 
 	if (gfp_mask & __GFP_NOFAIL)
-		goto bypass;
+		goto force;
 
 	if (fatal_signal_pending(current))
-		goto bypass;
+		goto force;
 
 	mem_cgroup_events(mem_over_limit, MEMCG_OOM, 1);
 
-	mem_cgroup_oom(mem_over_limit, gfp_mask, get_order(nr_pages));
+	mem_cgroup_oom(mem_over_limit, gfp_mask,
+		       get_order(nr_pages * PAGE_SIZE));
 nomem:
 	if (!(gfp_mask & __GFP_NOFAIL))
 		return -ENOMEM;
-bypass:
-	return -EINTR;
+force:
+	/*
+	 * The allocation either can't fail or will lead to more memory
+	 * being freed very soon.  Allow memory usage go over the limit
+	 * temporarily by force charging it.
+	 */
+	page_counter_charge(&memcg->memory, nr_pages);
+	if (do_swap_account)
+		page_counter_charge(&memcg->memsw, nr_pages);
+	css_get_many(&memcg->css, nr_pages);
+
+	return 0;
 
 done_restock:
 	css_get_many(&memcg->css, batch);
 	if (batch > nr_pages)
 		refill_stock(memcg, batch - nr_pages);
-	if (!(gfp_mask & __GFP_WAIT))
-		goto done;
+
 	/*
-	 * If the hierarchy is above the normal consumption range,
-	 * make the charging task trim their excess contribution.
+	 * If the hierarchy is above the normal consumption range, schedule
+	 * reclaim on returning to userland.  We can perform reclaim here
+	 * if __GFP_WAIT but let's always punt for simplicity and so that
+	 * GFP_KERNEL can consistently be used during reclaim.  @memcg is
+	 * not recorded as it most likely matches current's and won't
+	 * change in the meantime.  As high limit is checked again before
+	 * reclaim, the cost of mismatch is negligible.
 	 */
 	do {
-		if (page_counter_read(&memcg->memory) <= memcg->high)
-			continue;
-		mem_cgroup_events(memcg, MEMCG_HIGH, 1);
-		try_to_free_mem_cgroup_pages(memcg, nr_pages, gfp_mask, true);
+		if (page_counter_read(&memcg->memory) > memcg->high) {
+			current->memcg_nr_pages_over_high += nr_pages;
+			set_notify_resume(current);
+			break;
+		}
 	} while ((memcg = parent_mem_cgroup(memcg)));
-done:
-	return ret;
+
+	return 0;
 }
 
 static void cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
@@ -2174,55 +2215,6 @@ static void commit_charge(struct page *page, struct mem_cgroup *memcg,
 }
 
 #ifdef CONFIG_MEMCG_KMEM
-int memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp,
-		      unsigned long nr_pages)
-{
-	struct page_counter *counter;
-	int ret = 0;
-
-	ret = page_counter_try_charge(&memcg->kmem, nr_pages, &counter);
-	if (ret < 0)
-		return ret;
-
-	ret = try_charge(memcg, gfp, nr_pages);
-	if (ret == -EINTR)  {
-		/*
-		 * try_charge() chose to bypass to root due to OOM kill or
-		 * fatal signal.  Since our only options are to either fail
-		 * the allocation or charge it to this cgroup, do it as a
-		 * temporary condition. But we can't fail. From a kmem/slab
-		 * perspective, the cache has already been selected, by
-		 * mem_cgroup_kmem_get_cache(), so it is too late to change
-		 * our minds.
-		 *
-		 * This condition will only trigger if the task entered
-		 * memcg_charge_kmem in a sane state, but was OOM-killed
-		 * during try_charge() above. Tasks that were already dying
-		 * when the allocation triggers should have been already
-		 * directed to the root cgroup in memcontrol.h
-		 */
-		page_counter_charge(&memcg->memory, nr_pages);
-		if (do_swap_account)
-			page_counter_charge(&memcg->memsw, nr_pages);
-		css_get_many(&memcg->css, nr_pages);
-		ret = 0;
-	} else if (ret)
-		page_counter_uncharge(&memcg->kmem, nr_pages);
-
-	return ret;
-}
-
-void memcg_uncharge_kmem(struct mem_cgroup *memcg, unsigned long nr_pages)
-{
-	page_counter_uncharge(&memcg->memory, nr_pages);
-	if (do_swap_account)
-		page_counter_uncharge(&memcg->memsw, nr_pages);
-
-	page_counter_uncharge(&memcg->kmem, nr_pages);
-
-	css_put_many(&memcg->css, nr_pages);
-}
-
 static int memcg_alloc_cache_id(void)
 {
 	int id, size;
@@ -2384,85 +2376,58 @@ void __memcg_kmem_put_cache(struct kmem_cache *cachep)
 		css_put(&cachep->memcg_params.memcg->css);
 }
 
-/*
- * We need to verify if the allocation against current->mm->owner's memcg is
- * possible for the given order. But the page is not allocated yet, so we'll
- * need a further commit step to do the final arrangements.
- *
- * It is possible for the task to switch cgroups in this mean time, so at
- * commit time, we can't rely on task conversion any longer.  We'll then use
- * the handle argument to return to the caller which cgroup we should commit
- * against. We could also return the memcg directly and avoid the pointer
- * passing, but a boolean return value gives better semantics considering
- * the compiled-out case as well.
- *
- * Returning true means the allocation is possible.
- */
-bool
-__memcg_kmem_newpage_charge(gfp_t gfp, struct mem_cgroup **_memcg, int order)
+int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
+			      struct mem_cgroup *memcg)
 {
-	struct mem_cgroup *memcg;
+	unsigned int nr_pages = 1 << order;
+	struct page_counter *counter;
 	int ret;
 
-	*_memcg = NULL;
+	if (!memcg_kmem_is_active(memcg))
+		return 0;
 
-	memcg = get_mem_cgroup_from_mm(current->mm);
+	if (!page_counter_try_charge(&memcg->kmem, nr_pages, &counter))
+		return -ENOMEM;
 
-	if (!memcg_kmem_is_active(memcg)) {
-		css_put(&memcg->css);
-		return true;
+	ret = try_charge(memcg, gfp, nr_pages);
+	if (ret) {
+		page_counter_uncharge(&memcg->kmem, nr_pages);
+		return ret;
 	}
 
-	ret = memcg_charge_kmem(memcg, gfp, 1 << order);
-	if (!ret)
-		*_memcg = memcg;
+	page->mem_cgroup = memcg;
 
-	css_put(&memcg->css);
-	return (ret == 0);
+	return 0;
 }
 
-void __memcg_kmem_commit_charge(struct page *page, struct mem_cgroup *memcg,
-			      int order)
+int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
 {
-	VM_BUG_ON(mem_cgroup_is_root(memcg));
+	struct mem_cgroup *memcg;
+	int ret;
 
-	/* The page allocation failed. Revert */
-	if (!page) {
-		memcg_uncharge_kmem(memcg, 1 << order);
-		return;
-	}
-	page->mem_cgroup = memcg;
+	memcg = get_mem_cgroup_from_mm(current->mm);
+	ret = __memcg_kmem_charge_memcg(page, gfp, order, memcg);
+	css_put(&memcg->css);
+	return ret;
 }
 
-void __memcg_kmem_uncharge_pages(struct page *page, int order)
+void __memcg_kmem_uncharge(struct page *page, int order)
 {
 	struct mem_cgroup *memcg = page->mem_cgroup;
+	unsigned int nr_pages = 1 << order;
 
 	if (!memcg)
 		return;
 
 	VM_BUG_ON_PAGE(mem_cgroup_is_root(memcg), page);
 
-	memcg_uncharge_kmem(memcg, 1 << order);
-	page->mem_cgroup = NULL;
-}
-
-struct mem_cgroup *__mem_cgroup_from_kmem(void *ptr)
-{
-	struct mem_cgroup *memcg = NULL;
-	struct kmem_cache *cachep;
-	struct page *page;
-
-	page = virt_to_head_page(ptr);
-	if (PageSlab(page)) {
-		cachep = page->slab_cache;
-		if (!is_root_cache(cachep))
-			memcg = cachep->memcg_params.memcg;
-	} else
-		/* page allocated by alloc_kmem_pages */
-		memcg = page->mem_cgroup;
+	page_counter_uncharge(&memcg->kmem, nr_pages);
+	page_counter_uncharge(&memcg->memory, nr_pages);
+	if (do_swap_account)
+		page_counter_uncharge(&memcg->memsw, nr_pages);
 
-	return memcg;
+	page->mem_cgroup = NULL;
+	css_put_many(&memcg->css, nr_pages);
 }
 #endif /* CONFIG_MEMCG_KMEM */
 
@@ -2836,9 +2801,9 @@ static unsigned long tree_stat(struct mem_cgroup *memcg,
 	return val;
 }
 
-static inline u64 mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
+static inline unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
 {
-	u64 val;
+	unsigned long val;
 
 	if (mem_cgroup_is_root(memcg)) {
 		val = tree_stat(memcg, MEM_CGROUP_STAT_CACHE);
@@ -2851,7 +2816,7 @@ static inline u64 mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
 		else
 			val = page_counter_read(&memcg->memsw);
 	}
-	return val << PAGE_SHIFT;
+	return val;
 }
 
 enum {
@@ -2885,9 +2850,9 @@ static u64 mem_cgroup_read_u64(struct cgroup_subsys_state *css,
 	switch (MEMFILE_ATTR(cft->private)) {
 	case RES_USAGE:
 		if (counter == &memcg->memory)
-			return mem_cgroup_usage(memcg, false);
+			return (u64)mem_cgroup_usage(memcg, false) * PAGE_SIZE;
 		if (counter == &memcg->memsw)
-			return mem_cgroup_usage(memcg, true);
+			return (u64)mem_cgroup_usage(memcg, true) * PAGE_SIZE;
 		return (u64)page_counter_read(counter) * PAGE_SIZE;
 	case RES_LIMIT:
 		return (u64)counter->limit * PAGE_SIZE;
@@ -3387,7 +3352,6 @@ static int __mem_cgroup_usage_register_event(struct mem_cgroup *memcg,
 	ret = page_counter_memparse(args, "-1", &threshold);
 	if (ret)
 		return ret;
-	threshold <<= PAGE_SHIFT;
 
 	mutex_lock(&memcg->thresholds_lock);
 
@@ -4406,22 +4370,10 @@ static int mem_cgroup_do_precharge(unsigned long count)
 		mc.precharge += count;
 		return ret;
 	}
-	if (ret == -EINTR) {
-		cancel_charge(root_mem_cgroup, count);
-		return ret;
-	}
 
 	/* Try charges one by one with reclaim */
 	while (count--) {
 		ret = try_charge(mc.to, GFP_KERNEL & ~__GFP_NORETRY, 1);
-		/*
-		 * In case of failure, any residual charges against
-		 * mc.to will be dropped by mem_cgroup_clear_mc()
-		 * later on.  However, cancel any charges that are
-		 * bypassed to root right away or they'll be lost.
-		 */
-		if (ret == -EINTR)
-			cancel_charge(root_mem_cgroup, 1);
 		if (ret)
 			return ret;
 		mc.precharge++;
@@ -4576,9 +4528,8 @@ static int mem_cgroup_move_account(struct page *page,
 		goto out;
 
 	/*
-	 * Prevent mem_cgroup_migrate() from looking at page->mem_cgroup
-	 * of its source page while we change it: page migration takes
-	 * both pages off the LRU, but page cache replacement doesn't.
+	 * Prevent mem_cgroup_replace_page() from looking at
+	 * page->mem_cgroup of its source page while we change it.
 	 */
 	if (!trylock_page(page))
 		goto out;
@@ -5085,7 +5036,9 @@ static void mem_cgroup_bind(struct cgroup_subsys_state *root_css)
 static u64 memory_current_read(struct cgroup_subsys_state *css,
 			       struct cftype *cft)
 {
-	return mem_cgroup_usage(mem_cgroup_from_css(css), false);
+	struct mem_cgroup *memcg = mem_cgroup_from_css(css);
+
+	return (u64)page_counter_read(&memcg->memory) * PAGE_SIZE;
 }
 
 static int memory_low_show(struct seq_file *m, void *v)
@@ -5197,6 +5150,7 @@ static int memory_events_show(struct seq_file *m, void *v)
 static struct cftype memory_files[] = {
 	{
 		.name = "current",
+		.flags = CFTYPE_NOT_ON_ROOT,
 		.read_u64 = memory_current_read,
 	},
 	{
@@ -5340,11 +5294,6 @@ int mem_cgroup_try_charge(struct page *page, struct mm_struct *mm,
 	ret = try_charge(memcg, gfp_mask, nr_pages);
 
 	css_put(&memcg->css);
-
-	if (ret == -EINTR) {
-		memcg = root_mem_cgroup;
-		ret = 0;
-	}
 out:
 	*memcgp = memcg;
 	return ret;
@@ -5559,7 +5508,7 @@ void mem_cgroup_uncharge_list(struct list_head *page_list)
 }
 
 /**
- * mem_cgroup_migrate - migrate a charge to another page
+ * mem_cgroup_replace_page - migrate a charge to another page
  * @oldpage: currently charged page
  * @newpage: page to transfer the charge to
  * @lrucare: either or both pages might be on the LRU already
@@ -5568,16 +5517,13 @@ void mem_cgroup_uncharge_list(struct list_head *page_list)
  *
  * Both pages must be locked, @newpage->mapping must be set up.
  */
-void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
-			bool lrucare)
+void mem_cgroup_replace_page(struct page *oldpage, struct page *newpage)
 {
 	struct mem_cgroup *memcg;
 	int isolated;
 
 	VM_BUG_ON_PAGE(!PageLocked(oldpage), oldpage);
 	VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
-	VM_BUG_ON_PAGE(!lrucare && PageLRU(oldpage), oldpage);
-	VM_BUG_ON_PAGE(!lrucare && PageLRU(newpage), newpage);
 	VM_BUG_ON_PAGE(PageAnon(oldpage) != PageAnon(newpage), newpage);
 	VM_BUG_ON_PAGE(PageTransHuge(oldpage) != PageTransHuge(newpage),
 		       newpage);
@@ -5589,25 +5535,16 @@ void mem_cgroup_migrate(struct page *oldpage, struct page *newpage,
 	if (newpage->mem_cgroup)
 		return;
 
-	/*
-	 * Swapcache readahead pages can get migrated before being
-	 * charged, and migration from compaction can happen to an
-	 * uncharged page when the PFN walker finds a page that
-	 * reclaim just put back on the LRU but has not released yet.
-	 */
+	/* Swapcache readahead pages can get replaced before being charged */
 	memcg = oldpage->mem_cgroup;
 	if (!memcg)
 		return;
 
-	if (lrucare)
-		lock_page_lru(oldpage, &isolated);
-
+	lock_page_lru(oldpage, &isolated);
 	oldpage->mem_cgroup = NULL;
+	unlock_page_lru(oldpage, isolated);
 
-	if (lrucare)
-		unlock_page_lru(oldpage, isolated);
-
-	commit_charge(newpage, memcg, lrucare);
+	commit_charge(newpage, memcg, true);
 }
 
 /*

mm/memory-failure.c

@@ -56,6 +56,7 @@
 #include <linux/memory_hotplug.h>
 #include <linux/mm_inline.h>
 #include <linux/kfifo.h>
+#include <linux/ratelimit.h>
 #include "internal.h"
 #include "ras/ras_event.h"
 
@@ -1403,6 +1404,12 @@ static int __init memory_failure_init(void)
 }
 core_initcall(memory_failure_init);
 
+#define unpoison_pr_info(fmt, pfn, rs)			\
+({							\
+	if (__ratelimit(rs))				\
+		pr_info(fmt, pfn);			\
+})
+
 /**
  * unpoison_memory - Unpoison a previously poisoned page
  * @pfn: Page number of the to be unpoisoned page
@@ -1421,6 +1428,8 @@ int unpoison_memory(unsigned long pfn)
 	struct page *p;
 	int freeit = 0;
 	unsigned int nr_pages;
+	static DEFINE_RATELIMIT_STATE(unpoison_rs, DEFAULT_RATELIMIT_INTERVAL,
+					DEFAULT_RATELIMIT_BURST);
 
 	if (!pfn_valid(pfn))
 		return -ENXIO;
@@ -1429,23 +1438,26 @@ int unpoison_memory(unsigned long pfn)
 	page = compound_head(p);
 
 	if (!PageHWPoison(p)) {
-		pr_info("MCE: Page was already unpoisoned %#lx\n", pfn);
+		unpoison_pr_info("MCE: Page was already unpoisoned %#lx\n",
+				 pfn, &unpoison_rs);
 		return 0;
 	}
 
 	if (page_count(page) > 1) {
-		pr_info("MCE: Someone grabs the hwpoison page %#lx\n", pfn);
+		unpoison_pr_info("MCE: Someone grabs the hwpoison page %#lx\n",
+				 pfn, &unpoison_rs);
 		return 0;
 	}
 
 	if (page_mapped(page)) {
-		pr_info("MCE: Someone maps the hwpoison page %#lx\n", pfn);
+		unpoison_pr_info("MCE: Someone maps the hwpoison page %#lx\n",
+				 pfn, &unpoison_rs);
 		return 0;
 	}
 
 	if (page_mapping(page)) {
-		pr_info("MCE: the hwpoison page has non-NULL mapping %#lx\n",
-			pfn);
+		unpoison_pr_info("MCE: the hwpoison page has non-NULL mapping %#lx\n",
+				 pfn, &unpoison_rs);
 		return 0;
 	}
 
@@ -1455,7 +1467,8 @@ int unpoison_memory(unsigned long pfn)
 	 * In such case, we yield to memory_failure() and make unpoison fail.
 	 */
 	if (!PageHuge(page) && PageTransHuge(page)) {
-		pr_info("MCE: Memory failure is now running on %#lx\n", pfn);
+		unpoison_pr_info("MCE: Memory failure is now running on %#lx\n",
+				 pfn, &unpoison_rs);
 		return 0;
 	}
 
@@ -1469,12 +1482,14 @@ int unpoison_memory(unsigned long pfn)
 		 * to the end.
 		 */
 		if (PageHuge(page)) {
-			pr_info("MCE: Memory failure is now running on free hugepage %#lx\n", pfn);
+			unpoison_pr_info("MCE: Memory failure is now running on free hugepage %#lx\n",
+					 pfn, &unpoison_rs);
 			return 0;
 		}
 		if (TestClearPageHWPoison(p))
 			num_poisoned_pages_dec();
-		pr_info("MCE: Software-unpoisoned free page %#lx\n", pfn);
+		unpoison_pr_info("MCE: Software-unpoisoned free page %#lx\n",
+				 pfn, &unpoison_rs);
 		return 0;
 	}
 
@@ -1486,7 +1501,8 @@ int unpoison_memory(unsigned long pfn)
 	 * the free buddy page pool.
 	 */
 	if (TestClearPageHWPoison(page)) {
-		pr_info("MCE: Software-unpoisoned page %#lx\n", pfn);
+		unpoison_pr_info("MCE: Software-unpoisoned page %#lx\n",
+				 pfn, &unpoison_rs);
 		num_poisoned_pages_sub(nr_pages);
 		freeit = 1;
 		if (PageHuge(page))

mm/memory_hotplug.c

@@ -339,8 +339,8 @@ static int __ref ensure_zone_is_initialized(struct zone *zone,
 			unsigned long start_pfn, unsigned long num_pages)
 {
 	if (!zone_is_initialized(zone))
-		return init_currently_empty_zone(zone, start_pfn, num_pages,
-						 MEMMAP_HOTPLUG);
+		return init_currently_empty_zone(zone, start_pfn, num_pages);
+
 	return 0;
 }
 

mm/migrate.c

@@ -1,5 +1,5 @@
 /*
- * Memory Migration functionality - linux/mm/migration.c
+ * Memory Migration functionality - linux/mm/migrate.c
  *
  * Copyright (C) 2006 Silicon Graphics, Inc., Christoph Lameter
  *
@@ -30,7 +30,7 @@
 #include <linux/mempolicy.h>
 #include <linux/vmalloc.h>
 #include <linux/security.h>
-#include <linux/memcontrol.h>
+#include <linux/backing-dev.h>
 #include <linux/syscalls.h>
 #include <linux/hugetlb.h>
 #include <linux/hugetlb_cgroup.h>
@@ -171,6 +171,9 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
 	else
 		page_add_file_rmap(new);
 
+	if (vma->vm_flags & VM_LOCKED)
+		mlock_vma_page(new);
+
 	/* No need to invalidate - it was non-present before */
 	update_mmu_cache(vma, addr, ptep);
 unlock:
@@ -311,6 +314,8 @@ int migrate_page_move_mapping(struct address_space *mapping,
 		struct buffer_head *head, enum migrate_mode mode,
 		int extra_count)
 {
+	struct zone *oldzone, *newzone;
+	int dirty;
 	int expected_count = 1 + extra_count;
 	void **pslot;
 
@@ -318,9 +323,20 @@ int migrate_page_move_mapping(struct address_space *mapping,
 		/* Anonymous page without mapping */
 		if (page_count(page) != expected_count)
 			return -EAGAIN;
+
+		/* No turning back from here */
+		set_page_memcg(newpage, page_memcg(page));
+		newpage->index = page->index;
+		newpage->mapping = page->mapping;
+		if (PageSwapBacked(page))
+			SetPageSwapBacked(newpage);
+
 		return MIGRATEPAGE_SUCCESS;
 	}
 
+	oldzone = page_zone(page);
+	newzone = page_zone(newpage);
+
 	spin_lock_irq(&mapping->tree_lock);
 
 	pslot = radix_tree_lookup_slot(&mapping->page_tree,
@@ -353,14 +369,28 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	}
 
 	/*
-	 * Now we know that no one else is looking at the page.
+	 * Now we know that no one else is looking at the page:
+	 * no turning back from here.
 	 */
+	set_page_memcg(newpage, page_memcg(page));
+	newpage->index = page->index;
+	newpage->mapping = page->mapping;
+	if (PageSwapBacked(page))
+		SetPageSwapBacked(newpage);
+
 	get_page(newpage);	/* add cache reference */
 	if (PageSwapCache(page)) {
 		SetPageSwapCache(newpage);
 		set_page_private(newpage, page_private(page));
 	}
 
+	/* Move dirty while page refs frozen and newpage not yet exposed */
+	dirty = PageDirty(page);
+	if (dirty) {
+		ClearPageDirty(page);
+		SetPageDirty(newpage);
+	}
+
 	radix_tree_replace_slot(pslot, newpage);
 
 	/*
@@ -370,6 +400,9 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	 */
 	page_unfreeze_refs(page, expected_count - 1);
 
+	spin_unlock(&mapping->tree_lock);
+	/* Leave irq disabled to prevent preemption while updating stats */
+
 	/*
 	 * If moved to a different zone then also account
 	 * the page for that zone. Other VM counters will be
@@ -380,13 +413,19 @@ int migrate_page_move_mapping(struct address_space *mapping,
 	 * via NR_FILE_PAGES and NR_ANON_PAGES if they
 	 * are mapped to swap space.
 	 */
-	__dec_zone_page_state(page, NR_FILE_PAGES);
-	__inc_zone_page_state(newpage, NR_FILE_PAGES);
-	if (!PageSwapCache(page) && PageSwapBacked(page)) {
-		__dec_zone_page_state(page, NR_SHMEM);
-		__inc_zone_page_state(newpage, NR_SHMEM);
+	if (newzone != oldzone) {
+		__dec_zone_state(oldzone, NR_FILE_PAGES);
+		__inc_zone_state(newzone, NR_FILE_PAGES);
+		if (PageSwapBacked(page) && !PageSwapCache(page)) {
+			__dec_zone_state(oldzone, NR_SHMEM);
+			__inc_zone_state(newzone, NR_SHMEM);
+		}
+		if (dirty && mapping_cap_account_dirty(mapping)) {
+			__dec_zone_state(oldzone, NR_FILE_DIRTY);
+			__inc_zone_state(newzone, NR_FILE_DIRTY);
+		}
 	}
-	spin_unlock_irq(&mapping->tree_lock);
+	local_irq_enable();
 
 	return MIGRATEPAGE_SUCCESS;
 }
@@ -401,12 +440,6 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
 	int expected_count;
 	void **pslot;
 
-	if (!mapping) {
-		if (page_count(page) != 1)
-			return -EAGAIN;
-		return MIGRATEPAGE_SUCCESS;
-	}
-
 	spin_lock_irq(&mapping->tree_lock);
 
 	pslot = radix_tree_lookup_slot(&mapping->page_tree,
@@ -424,6 +457,9 @@ int migrate_huge_page_move_mapping(struct address_space *mapping,
 		return -EAGAIN;
 	}
 
+	set_page_memcg(newpage, page_memcg(page));
+	newpage->index = page->index;
+	newpage->mapping = page->mapping;
 	get_page(newpage);
 
 	radix_tree_replace_slot(pslot, newpage);
@@ -510,20 +546,9 @@ void migrate_page_copy(struct page *newpage, struct page *page)
 	if (PageMappedToDisk(page))
 		SetPageMappedToDisk(newpage);
 
-	if (PageDirty(page)) {
-		clear_page_dirty_for_io(page);
-		/*
-		 * Want to mark the page and the radix tree as dirty, and
-		 * redo the accounting that clear_page_dirty_for_io undid,
-		 * but we can't use set_page_dirty because that function
-		 * is actually a signal that all of the page has become dirty.
-		 * Whereas only part of our page may be dirty.
-		 */
-		if (PageSwapBacked(page))
-			SetPageDirty(newpage);
-		else
-			__set_page_dirty_nobuffers(newpage);
- 	}
+	/* Move dirty on pages not done by migrate_page_move_mapping() */
+	if (PageDirty(page))
+		SetPageDirty(newpage);
 
 	if (page_is_young(page))
 		set_page_young(newpage);
@@ -537,7 +562,6 @@ void migrate_page_copy(struct page *newpage, struct page *page)
 	cpupid = page_cpupid_xchg_last(page, -1);
 	page_cpupid_xchg_last(newpage, cpupid);
 
-	mlock_migrate_page(newpage, page);
 	ksm_migrate_page(newpage, page);
 	/*
 	 * Please do not reorder this without considering how mm/ksm.c's
@@ -721,33 +745,13 @@ static int fallback_migrate_page(struct address_space *mapping,
  *  MIGRATEPAGE_SUCCESS - success
  */
 static int move_to_new_page(struct page *newpage, struct page *page,
-				int page_was_mapped, enum migrate_mode mode)
+				enum migrate_mode mode)
 {
 	struct address_space *mapping;
 	int rc;
 
-	/*
-	 * Block others from accessing the page when we get around to
-	 * establishing additional references. We are the only one
-	 * holding a reference to the new page at this point.
-	 */
-	if (!trylock_page(newpage))
-		BUG();
-
-	/* Prepare mapping for the new page.*/
-	newpage->index = page->index;
-	newpage->mapping = page->mapping;
-	if (PageSwapBacked(page))
-		SetPageSwapBacked(newpage);
-
-	/*
-	 * Indirectly called below, migrate_page_copy() copies PG_dirty and thus
-	 * needs newpage's memcg set to transfer memcg dirty page accounting.
-	 * So perform memcg migration in two steps:
-	 * 1. set newpage->mem_cgroup (here)
-	 * 2. clear page->mem_cgroup (below)
-	 */
-	set_page_memcg(newpage, page_memcg(page));
+	VM_BUG_ON_PAGE(!PageLocked(page), page);
+	VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
 
 	mapping = page_mapping(page);
 	if (!mapping)
@@ -759,23 +763,19 @@ static int move_to_new_page(struct page *newpage, struct page *page,
 		 * space which also has its own migratepage callback. This
 		 * is the most common path for page migration.
 		 */
-		rc = mapping->a_ops->migratepage(mapping,
-						newpage, page, mode);
+		rc = mapping->a_ops->migratepage(mapping, newpage, page, mode);
 	else
 		rc = fallback_migrate_page(mapping, newpage, page, mode);
 
-	if (rc != MIGRATEPAGE_SUCCESS) {
-		set_page_memcg(newpage, NULL);
-		newpage->mapping = NULL;
-	} else {
+	/*
+	 * When successful, old pagecache page->mapping must be cleared before
+	 * page is freed; but stats require that PageAnon be left as PageAnon.
+	 */
+	if (rc == MIGRATEPAGE_SUCCESS) {
 		set_page_memcg(page, NULL);
-		if (page_was_mapped)
-			remove_migration_ptes(page, newpage);
-		page->mapping = NULL;
+		if (!PageAnon(page))
+			page->mapping = NULL;
 	}
-
-	unlock_page(newpage);
-
 	return rc;
 }
 
@@ -824,6 +824,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
 			goto out_unlock;
 		wait_on_page_writeback(page);
 	}
+
 	/*
 	 * By try_to_unmap(), page->mapcount goes down to 0 here. In this case,
 	 * we cannot notice that anon_vma is freed while we migrates a page.
@@ -831,34 +832,26 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
 	 * of migration. File cache pages are no problem because of page_lock()
 	 * File Caches may use write_page() or lock_page() in migration, then,
 	 * just care Anon page here.
+	 *
+	 * Only page_get_anon_vma() understands the subtleties of
+	 * getting a hold on an anon_vma from outside one of its mms.
+	 * But if we cannot get anon_vma, then we won't need it anyway,
+	 * because that implies that the anon page is no longer mapped
+	 * (and cannot be remapped so long as we hold the page lock).
 	 */
-	if (PageAnon(page) && !PageKsm(page)) {
-		/*
-		 * Only page_lock_anon_vma_read() understands the subtleties of
-		 * getting a hold on an anon_vma from outside one of its mms.
-		 */
+	if (PageAnon(page) && !PageKsm(page))
 		anon_vma = page_get_anon_vma(page);
-		if (anon_vma) {
-			/*
-			 * Anon page
-			 */
-		} else if (PageSwapCache(page)) {
-			/*
-			 * We cannot be sure that the anon_vma of an unmapped
-			 * swapcache page is safe to use because we don't
-			 * know in advance if the VMA that this page belonged
-			 * to still exists. If the VMA and others sharing the
-			 * data have been freed, then the anon_vma could
-			 * already be invalid.
-			 *
-			 * To avoid this possibility, swapcache pages get
-			 * migrated but are not remapped when migration
-			 * completes
-			 */
-		} else {
-			goto out_unlock;
-		}
-	}
+
+	/*
+	 * Block others from accessing the new page when we get around to
+	 * establishing additional references. We are usually the only one
+	 * holding a reference to newpage at this point. We used to have a BUG
+	 * here if trylock_page(newpage) fails, but would like to allow for
+	 * cases where there might be a race with the previous use of newpage.
+	 * This is much like races on refcount of oldpage: just don't BUG().
+	 */
+	if (unlikely(!trylock_page(newpage)))
+		goto out_unlock;
 
 	if (unlikely(isolated_balloon_page(page))) {
 		/*
@@ -869,7 +862,7 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
 		 * the page migration right away (proteced by page lock).
 		 */
 		rc = balloon_page_migrate(newpage, page, mode);
-		goto out_unlock;
+		goto out_unlock_both;
 	}
 
 	/*
@@ -888,30 +881,30 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
 		VM_BUG_ON_PAGE(PageAnon(page), page);
 		if (page_has_private(page)) {
 			try_to_free_buffers(page);
-			goto out_unlock;
+			goto out_unlock_both;
 		}
-		goto skip_unmap;
-	}
-
-	/* Establish migration ptes or remove ptes */
-	if (page_mapped(page)) {
+	} else if (page_mapped(page)) {
+		/* Establish migration ptes */
+		VM_BUG_ON_PAGE(PageAnon(page) && !PageKsm(page) && !anon_vma,
+				page);
 		try_to_unmap(page,
 			TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
 		page_was_mapped = 1;
 	}
 
-skip_unmap:
 	if (!page_mapped(page))
-		rc = move_to_new_page(newpage, page, page_was_mapped, mode);
+		rc = move_to_new_page(newpage, page, mode);
 
-	if (rc && page_was_mapped)
-		remove_migration_ptes(page, page);
+	if (page_was_mapped)
+		remove_migration_ptes(page,
+			rc == MIGRATEPAGE_SUCCESS ? newpage : page);
 
+out_unlock_both:
+	unlock_page(newpage);
+out_unlock:
 	/* Drop an anon_vma reference if we took one */
 	if (anon_vma)
 		put_anon_vma(anon_vma);
-
-out_unlock:
 	unlock_page(page);
 out:
 	return rc;
@@ -937,10 +930,11 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page,
 				   int force, enum migrate_mode mode,
 				   enum migrate_reason reason)
 {
-	int rc = 0;
+	int rc = MIGRATEPAGE_SUCCESS;
 	int *result = NULL;
-	struct page *newpage = get_new_page(page, private, &result);
+	struct page *newpage;
 
+	newpage = get_new_page(page, private, &result);
 	if (!newpage)
 		return -ENOMEM;
 
@@ -954,6 +948,8 @@ static ICE_noinline int unmap_and_move(new_page_t get_new_page,
 			goto out;
 
 	rc = __unmap_and_move(page, newpage, force, mode);
+	if (rc == MIGRATEPAGE_SUCCESS)
+		put_new_page = NULL;
 
 out:
 	if (rc != -EAGAIN) {
@@ -980,10 +976,9 @@ out:
 	 * it.  Otherwise, putback_lru_page() will drop the reference grabbed
 	 * during isolation.
 	 */
-	if (rc != MIGRATEPAGE_SUCCESS && put_new_page) {
-		ClearPageSwapBacked(newpage);
+	if (put_new_page)
 		put_new_page(newpage, private);
-	} else if (unlikely(__is_movable_balloon_page(newpage))) {
+	else if (unlikely(__is_movable_balloon_page(newpage))) {
 		/* drop our reference, page already in the balloon */
 		put_page(newpage);
 	} else
@@ -1021,7 +1016,7 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
 				struct page *hpage, int force,
 				enum migrate_mode mode)
 {
-	int rc = 0;
+	int rc = -EAGAIN;
 	int *result = NULL;
 	int page_was_mapped = 0;
 	struct page *new_hpage;
@@ -1043,8 +1038,6 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
 	if (!new_hpage)
 		return -ENOMEM;
 
-	rc = -EAGAIN;
-
 	if (!trylock_page(hpage)) {
 		if (!force || mode != MIGRATE_SYNC)
 			goto out;
@@ -1054,6 +1047,9 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
 	if (PageAnon(hpage))
 		anon_vma = page_get_anon_vma(hpage);
 
+	if (unlikely(!trylock_page(new_hpage)))
+		goto put_anon;
+
 	if (page_mapped(hpage)) {
 		try_to_unmap(hpage,
 			TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
@@ -1061,16 +1057,22 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
 	}
 
 	if (!page_mapped(hpage))
-		rc = move_to_new_page(new_hpage, hpage, page_was_mapped, mode);
+		rc = move_to_new_page(new_hpage, hpage, mode);
+
+	if (page_was_mapped)
+		remove_migration_ptes(hpage,
+			rc == MIGRATEPAGE_SUCCESS ? new_hpage : hpage);
 
-	if (rc != MIGRATEPAGE_SUCCESS && page_was_mapped)
-		remove_migration_ptes(hpage, hpage);
+	unlock_page(new_hpage);
 
+put_anon:
 	if (anon_vma)
 		put_anon_vma(anon_vma);
 
-	if (rc == MIGRATEPAGE_SUCCESS)
+	if (rc == MIGRATEPAGE_SUCCESS) {
 		hugetlb_cgroup_migrate(hpage, new_hpage);
+		put_new_page = NULL;
+	}
 
 	unlock_page(hpage);
 out:
@@ -1082,7 +1084,7 @@ out:
 	 * it.  Otherwise, put_page() will drop the reference grabbed during
 	 * isolation.
 	 */
-	if (rc != MIGRATEPAGE_SUCCESS && put_new_page)
+	if (put_new_page)
 		put_new_page(new_hpage, private);
 	else
 		putback_active_hugepage(new_hpage);
@@ -1112,7 +1114,7 @@ out:
  *
  * The function returns after 10 attempts or if no pages are movable any more
  * because the list has become empty or no retryable pages exist any more.
- * The caller should call putback_lru_pages() to return pages to the LRU
+ * The caller should call putback_movable_pages() to return pages to the LRU
  * or free list only if ret != 0.
  *
  * Returns the number of pages that were not migrated, or an error code.
@@ -1169,7 +1171,8 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
 			}
 		}
 	}
-	rc = nr_failed + retry;
+	nr_failed += retry;
+	rc = nr_failed;
 out:
 	if (nr_succeeded)
 		count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
@@ -1786,7 +1789,6 @@ fail_putback:
 			SetPageActive(page);
 		if (TestClearPageUnevictable(new_page))
 			SetPageUnevictable(page);
-		mlock_migrate_page(page, new_page);
 
 		unlock_page(new_page);
 		put_page(new_page);		/* Free it */
@@ -1828,8 +1830,9 @@ fail_putback:
 		goto fail_putback;
 	}
 
-	mem_cgroup_migrate(page, new_page, false);
-
+	mlock_migrate_page(new_page, page);
+	set_page_memcg(new_page, page_memcg(page));
+	set_page_memcg(page, NULL);
 	page_remove_rmap(page);
 
 	spin_unlock(ptl);

mm/mincore.c

@@ -234,7 +234,7 @@ SYSCALL_DEFINE3(mincore, unsigned long, start, size_t, len,
 
 	/* This also avoids any overflows on PAGE_CACHE_ALIGN */
 	pages = len >> PAGE_SHIFT;
-	pages += (len & ~PAGE_MASK) != 0;
+	pages += (offset_in_page(len)) != 0;
 
 	if (!access_ok(VERIFY_WRITE, vec, pages))
 		return -EFAULT;