mm: remove CONFIG_HAVE_MEMBLOCK

All architecures use memblock for early memory management. There is no need
for the CONFIG_HAVE_MEMBLOCK configuration option.

[rppt@linux.vnet.ibm.com: of/fdt: fixup #ifdefs]
  Link: http://lkml.kernel.org/r/20180919103457.GA20545@rapoport-lnx
[rppt@linux.vnet.ibm.com: csky: fixups after bootmem removal]
  Link: http://lkml.kernel.org/r/20180926112744.GC4628@rapoport-lnx
[rppt@linux.vnet.ibm.com: remove stale #else and the code it protects]
  Link: http://lkml.kernel.org/r/1538067825-24835-1-git-send-email-rppt@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1536927045-23536-4-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Tested-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Serge Semin <fancer.lancer@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/Kconfig

@@ -31,7 +31,6 @@ config ALPHA
 	select ODD_RT_SIGACTION
 	select OLD_SIGSUSPEND
 	select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
-	select HAVE_MEMBLOCK
 	help
 	  The Alpha is a 64-bit general-purpose processor designed and
 	  marketed by the Digital Equipment Corporation of blessed memory,

arch/arc/Kconfig

@@ -37,7 +37,6 @@ config ARC
 	select HAVE_KERNEL_LZMA
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
-	select HAVE_MEMBLOCK
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_OPROFILE
 	select HAVE_PERF_EVENTS

arch/arm/Kconfig

@@ -82,7 +82,6 @@ config ARM
 	select HAVE_KERNEL_XZ
 	select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
 	select HAVE_KRETPROBES if (HAVE_KPROBES)
-	select HAVE_MEMBLOCK
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_NMI
 	select HAVE_OPROFILE if (HAVE_PERF_EVENTS)

arch/arm64/Kconfig

@@ -139,7 +139,6 @@ config ARM64
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_HW_BREAKPOINT if PERF_EVENTS
 	select HAVE_IRQ_TIME_ACCOUNTING
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP if NUMA
 	select HAVE_NMI
 	select HAVE_PATA_PLATFORM

arch/c6x/Kconfig

@@ -13,7 +13,6 @@ config C6X
 	select GENERIC_ATOMIC64
 	select GENERIC_IRQ_SHOW
 	select HAVE_ARCH_TRACEHOOK
-	select HAVE_MEMBLOCK
 	select SPARSE_IRQ
 	select IRQ_DOMAIN
 	select OF

arch/csky/Kconfig

@@ -36,7 +36,6 @@ config CSKY
 	select HAVE_C_RECORDMCOUNT
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_CONTIGUOUS
-	select HAVE_MEMBLOCK
 	select MAY_HAVE_SPARSE_IRQ
 	select MODULES_USE_ELF_RELA if MODULES
 	select OF

arch/csky/kernel/setup.c

@@ -3,7 +3,6 @@
 
 #include <linux/console.h>
 #include <linux/memblock.h>
-#include <linux/bootmem.h>
 #include <linux/initrd.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>

arch/csky/mm/highmem.c

@@ -4,7 +4,7 @@
 #include <linux/module.h>
 #include <linux/highmem.h>
 #include <linux/smp.h>
-#include <linux/bootmem.h>
+#include <linux/memblock.h>
 #include <asm/fixmap.h>
 #include <asm/tlbflush.h>
 #include <asm/cacheflush.h>
@@ -140,7 +140,7 @@ static void __init fixrange_init(unsigned long start, unsigned long end,
 			pmd = (pmd_t *)pud;
 			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
 				if (pmd_none(*pmd)) {
-					pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+					pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
 					set_pmd(pmd, __pmd(__pa(pte)));
 					BUG_ON(pte != pte_offset_kernel(pmd, 0));
 				}

arch/csky/mm/init.c

@@ -14,7 +14,6 @@
 #include <linux/ptrace.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
-#include <linux/bootmem.h>
 #include <linux/highmem.h>
 #include <linux/memblock.h>
 #include <linux/swap.h>
@@ -47,7 +46,7 @@ void __init mem_init(void)
 #endif
 	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
 
-	free_all_bootmem();
+	memblock_free_all();
 
 #ifdef CONFIG_HIGHMEM
 	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {

arch/h8300/Kconfig

@@ -15,7 +15,6 @@ config H8300
 	select OF
 	select OF_IRQ
 	select OF_EARLY_FLATTREE
-	select HAVE_MEMBLOCK
 	select TIMER_OF
 	select H8300_TMR8
 	select HAVE_KERNEL_GZIP

arch/hexagon/Kconfig

@@ -21,7 +21,6 @@ config HEXAGON
 	select GENERIC_IRQ_SHOW
 	select HAVE_ARCH_KGDB
 	select HAVE_ARCH_TRACEHOOK
-	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
 	select NEED_SG_DMA_LENGTH
 	select NO_IOPORT_MAP

arch/ia64/Kconfig

@@ -26,7 +26,6 @@ config IA64
 	select HAVE_FUNCTION_TRACER
 	select TTY
 	select HAVE_ARCH_TRACEHOOK
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_VIRT_CPU_ACCOUNTING
 	select ARCH_HAS_DMA_MARK_CLEAN

arch/m68k/Kconfig

@@ -27,7 +27,6 @@ config M68K
 	select OLD_SIGSUSPEND3
 	select OLD_SIGACTION
 	select DMA_DIRECT_OPS if HAS_DMA
-	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
 
 config CPU_BIG_ENDIAN

arch/microblaze/Kconfig

@@ -28,7 +28,6 @@ config MICROBLAZE
 	select HAVE_FTRACE_MCOUNT_RECORD
 	select HAVE_FUNCTION_GRAPH_TRACER
 	select HAVE_FUNCTION_TRACER
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_OPROFILE
 	select IRQ_DOMAIN

arch/mips/Kconfig

@@ -60,7 +60,6 @@ config MIPS
 	select HAVE_IRQ_TIME_ACCOUNTING
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_NMI

arch/nds32/Kconfig

@@ -29,7 +29,6 @@ config NDS32
 	select HANDLE_DOMAIN_IRQ
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_DEBUG_KMEMLEAK
-	select HAVE_MEMBLOCK
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select IRQ_DOMAIN
 	select LOCKDEP_SUPPORT

arch/nios2/Kconfig

@@ -23,7 +23,6 @@ config NIOS2
 	select SPARSE_IRQ
 	select USB_ARCH_HAS_HCD if USB_SUPPORT
 	select CPU_NO_EFFICIENT_FFS
-	select HAVE_MEMBLOCK
 	select ARCH_DISCARD_MEMBLOCK
 
 config GENERIC_CSUM

arch/openrisc/Kconfig

@@ -12,7 +12,6 @@ config OPENRISC
 	select OF_EARLY_FLATTREE
 	select IRQ_DOMAIN
 	select HANDLE_DOMAIN_IRQ
-	select HAVE_MEMBLOCK
 	select GPIOLIB
         select HAVE_ARCH_TRACEHOOK
 	select SPARSE_IRQ

arch/parisc/Kconfig

@@ -15,7 +15,6 @@ config PARISC
 	select RTC_CLASS
 	select RTC_DRV_GENERIC
 	select INIT_ALL_POSSIBLE
-	select HAVE_MEMBLOCK
 	select BUG
 	select BUILDTIME_EXTABLE_SORT
 	select HAVE_PERF_EVENTS

arch/powerpc/Kconfig

@@ -206,7 +206,6 @@ config PPC
 	select HAVE_KRETPROBES
 	select HAVE_LD_DEAD_CODE_DATA_ELIMINATION
 	select HAVE_LIVEPATCH			if HAVE_DYNAMIC_FTRACE_WITH_REGS
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_NMI				if PERF_EVENTS || (PPC64 && PPC_BOOK3S)

arch/riscv/Kconfig

@@ -28,7 +28,6 @@ config RISCV
 	select GENERIC_STRNLEN_USER
 	select GENERIC_SMP_IDLE_THREAD
 	select GENERIC_ATOMIC64 if !64BIT || !RISCV_ISA_A
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_DMA_CONTIGUOUS
 	select HAVE_FUTEX_CMPXCHG if FUTEX

arch/s390/Kconfig

@@ -163,7 +163,6 @@ config S390
 	select HAVE_LIVEPATCH
 	select HAVE_PERF_REGS
 	select HAVE_PERF_USER_STACK_DUMP
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_MEMBLOCK_PHYS_MAP
 	select HAVE_MOD_ARCH_SPECIFIC

arch/sh/Kconfig

@@ -9,7 +9,6 @@ config SUPERH
 	select CLKDEV_LOOKUP
 	select DMA_DIRECT_OPS
 	select HAVE_IDE if HAS_IOPORT_MAP
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select ARCH_DISCARD_MEMBLOCK
 	select HAVE_OPROFILE

arch/sparc/Kconfig

@@ -45,7 +45,6 @@ config SPARC
 	select LOCKDEP_SMALL if LOCKDEP
 	select NEED_DMA_MAP_STATE
 	select NEED_SG_DMA_LENGTH
-	select HAVE_MEMBLOCK
 
 config SPARC32
 	def_bool !64BIT

arch/um/Kconfig

@@ -12,7 +12,6 @@ config UML
 	select HAVE_UID16
 	select HAVE_FUTEX_CMPXCHG if FUTEX
 	select HAVE_DEBUG_KMEMLEAK
-	select HAVE_MEMBLOCK
 	select GENERIC_IRQ_SHOW
 	select GENERIC_CPU_DEVICES
 	select GENERIC_CLOCKEVENTS

arch/unicore32/Kconfig

@@ -5,7 +5,6 @@ config UNICORE32
 	select ARCH_MIGHT_HAVE_PC_PARPORT
 	select ARCH_MIGHT_HAVE_PC_SERIO
 	select DMA_DIRECT_OPS
-	select HAVE_MEMBLOCK
 	select HAVE_GENERIC_DMA_COHERENT
 	select HAVE_KERNEL_GZIP
 	select HAVE_KERNEL_BZIP2

arch/x86/Kconfig

@@ -169,7 +169,6 @@ config X86
 	select HAVE_KRETPROBES
 	select HAVE_KVM
 	select HAVE_LIVEPATCH			if X86_64
-	select HAVE_MEMBLOCK
 	select HAVE_MEMBLOCK_NODE_MAP
 	select HAVE_MIXED_BREAKPOINTS_REGS
 	select HAVE_MOD_ARCH_SPECIFIC

arch/xtensa/Kconfig

@@ -28,7 +28,6 @@ config XTENSA
 	select HAVE_FUTEX_CMPXCHG if !MMU
 	select HAVE_HW_BREAKPOINT if PERF_EVENTS
 	select HAVE_IRQ_TIME_ACCOUNTING
-	select HAVE_MEMBLOCK
 	select HAVE_OPROFILE
 	select HAVE_PERF_EVENTS
 	select HAVE_STACKPROTECTOR

drivers/of/fdt.c

@@ -1115,7 +1115,6 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 	return 1;
 }
 
-#ifdef CONFIG_HAVE_MEMBLOCK
 #ifndef MIN_MEMBLOCK_ADDR
 #define MIN_MEMBLOCK_ADDR	__pa(PAGE_OFFSET)
 #endif
@@ -1178,26 +1177,6 @@ int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
 	return memblock_reserve(base, size);
 }
 
-#else
-void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size)
-{
-	WARN_ON(1);
-}
-
-int __init __weak early_init_dt_mark_hotplug_memory_arch(u64 base, u64 size)
-{
-	return -ENOSYS;
-}
-
-int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
-					phys_addr_t size, bool nomap)
-{
-	pr_err("Reserved memory not supported, ignoring range %pa - %pa%s\n",
-		  &base, &size, nomap ? " (nomap)" : "");
-	return -ENOSYS;
-}
-#endif
-
 static void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 {
 	return memblock_virt_alloc(size, align);

drivers/of/of_reserved_mem.c

@@ -20,13 +20,12 @@
 #include <linux/of_reserved_mem.h>
 #include <linux/sort.h>
 #include <linux/slab.h>
+#include <linux/memblock.h>
 
 #define MAX_RESERVED_REGIONS	32
 static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
 static int reserved_mem_count;
 
-#if defined(CONFIG_HAVE_MEMBLOCK)
-#include <linux/memblock.h>
 int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
 	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
 	phys_addr_t *res_base)
@@ -54,16 +53,6 @@ int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
 		return memblock_remove(base, size);
 	return 0;
 }
-#else
-int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
-	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
-	phys_addr_t *res_base)
-{
-	pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
-		  size, nomap ? " (nomap)" : "");
-	return -ENOSYS;
-}
-#endif
 
 /**
  * res_mem_save_node() - save fdt node for second pass initialization

drivers/staging/android/ion/Kconfig

@@ -1,6 +1,6 @@
 menuconfig ION
 	bool "Ion Memory Manager"
-	depends on HAVE_MEMBLOCK && HAS_DMA && MMU
+	depends on HAS_DMA && MMU
 	select GENERIC_ALLOCATOR
 	select DMA_SHARED_BUFFER
 	help

fs/pstore/Kconfig

@@ -141,7 +141,6 @@ config PSTORE_RAM
 	tristate "Log panic/oops to a RAM buffer"
 	depends on PSTORE
 	depends on HAS_IOMEM
-	depends on HAVE_MEMBLOCK
 	select REED_SOLOMON
 	select REED_SOLOMON_ENC8
 	select REED_SOLOMON_DEC8

include/linux/bootmem.h

@@ -132,9 +132,6 @@ extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
 #define alloc_bootmem_low_pages_node(pgdat, x) \
 	__alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
 
-
-#if defined(CONFIG_HAVE_MEMBLOCK)
-
 /* FIXME: use MEMBLOCK_ALLOC_* variants here */
 #define BOOTMEM_ALLOC_ACCESSIBLE	0
 #define BOOTMEM_ALLOC_ANYWHERE		(~(phys_addr_t)0)
@@ -234,115 +231,6 @@ static inline void __init memblock_free_late(
 	__memblock_free_late(base, size);
 }
 
-#else
-
-#define BOOTMEM_ALLOC_ACCESSIBLE	0
-
-
-/* Fall back to all the existing bootmem APIs */
-static inline void * __init memblock_virt_alloc(
-					phys_addr_t size,  phys_addr_t align)
-{
-	if (!align)
-		align = SMP_CACHE_BYTES;
-	return __alloc_bootmem(size, align, BOOTMEM_LOW_LIMIT);
-}
-
-static inline void * __init memblock_virt_alloc_raw(
-					phys_addr_t size,  phys_addr_t align)
-{
-	if (!align)
-		align = SMP_CACHE_BYTES;
-	return __alloc_bootmem_nopanic(size, align, BOOTMEM_LOW_LIMIT);
-}
-
-static inline void * __init memblock_virt_alloc_nopanic(
-					phys_addr_t size, phys_addr_t align)
-{
-	if (!align)
-		align = SMP_CACHE_BYTES;
-	return __alloc_bootmem_nopanic(size, align, BOOTMEM_LOW_LIMIT);
-}
-
-static inline void * __init memblock_virt_alloc_low(
-					phys_addr_t size, phys_addr_t align)
-{
-	if (!align)
-		align = SMP_CACHE_BYTES;
-	return __alloc_bootmem_low(size, align, 0);
-}
-
-static inline void * __init memblock_virt_alloc_low_nopanic(
-					phys_addr_t size, phys_addr_t align)
-{
-	if (!align)
-		align = SMP_CACHE_BYTES;
-	return __alloc_bootmem_low_nopanic(size, align, 0);
-}
-
-static inline void * __init memblock_virt_alloc_from_nopanic(
-		phys_addr_t size, phys_addr_t align, phys_addr_t min_addr)
-{
-	return __alloc_bootmem_nopanic(size, align, min_addr);
-}
-
-static inline void * __init memblock_virt_alloc_node(
-						phys_addr_t size, int nid)
-{
-	return __alloc_bootmem_node(NODE_DATA(nid), size, SMP_CACHE_BYTES,
-				     BOOTMEM_LOW_LIMIT);
-}
-
-static inline void * __init memblock_virt_alloc_node_nopanic(
-						phys_addr_t size, int nid)
-{
-	return __alloc_bootmem_node_nopanic(NODE_DATA(nid), size,
-					     SMP_CACHE_BYTES,
-					     BOOTMEM_LOW_LIMIT);
-}
-
-static inline void * __init memblock_virt_alloc_try_nid(phys_addr_t size,
-	phys_addr_t align, phys_addr_t min_addr, phys_addr_t max_addr, int nid)
-{
-	return __alloc_bootmem_node_high(NODE_DATA(nid), size, align,
-					  min_addr);
-}
-
-static inline void * __init memblock_virt_alloc_try_nid_raw(
-			phys_addr_t size, phys_addr_t align,
-			phys_addr_t min_addr, phys_addr_t max_addr, int nid)
-{
-	return ___alloc_bootmem_node_nopanic(NODE_DATA(nid), size, align,
-				min_addr, max_addr);
-}
-
-static inline void * __init memblock_virt_alloc_try_nid_nopanic(
-			phys_addr_t size, phys_addr_t align,
-			phys_addr_t min_addr, phys_addr_t max_addr, int nid)
-{
-	return ___alloc_bootmem_node_nopanic(NODE_DATA(nid), size, align,
-				min_addr, max_addr);
-}
-
-static inline void __init memblock_free_early(
-					phys_addr_t base, phys_addr_t size)
-{
-	free_bootmem(base, size);
-}
-
-static inline void __init memblock_free_early_nid(
-				phys_addr_t base, phys_addr_t size, int nid)
-{
-	free_bootmem_node(NODE_DATA(nid), base, size);
-}
-
-static inline void __init memblock_free_late(
-					phys_addr_t base, phys_addr_t size)
-{
-	free_bootmem_late(base, size);
-}
-#endif /* defined(CONFIG_HAVE_MEMBLOCK) */
-
 extern void *alloc_large_system_hash(const char *tablename,
 				     unsigned long bucketsize,
 				     unsigned long numentries,

include/linux/memblock.h

@@ -2,7 +2,6 @@
 #define _LINUX_MEMBLOCK_H
 #ifdef __KERNEL__
 
-#ifdef CONFIG_HAVE_MEMBLOCK
 /*
  * Logical memory blocks.
  *
@@ -440,12 +439,6 @@ static inline void early_memtest(phys_addr_t start, phys_addr_t end)
 {
 }
 #endif
-#else
-static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t align)
-{
-	return 0;
-}
-#endif /* CONFIG_HAVE_MEMBLOCK */
 
 #endif /* __KERNEL__ */
 

include/linux/mm.h

@@ -2163,7 +2163,7 @@ extern int __meminit __early_pfn_to_nid(unsigned long pfn,
 					struct mminit_pfnnid_cache *state);
 #endif
 
-#if defined(CONFIG_HAVE_MEMBLOCK) && !defined(CONFIG_FLAT_NODE_MEM_MAP)
+#if !defined(CONFIG_FLAT_NODE_MEM_MAP)
 void zero_resv_unavail(void);
 #else
 static inline void zero_resv_unavail(void) {}

lib/Kconfig.debug

@@ -1292,7 +1292,7 @@ config DEBUG_KOBJECT
 	depends on DEBUG_KERNEL
 	help
 	  If you say Y here, some extra kobject debugging messages will be sent
-	  to the syslog. 
+	  to the syslog.
 
 config DEBUG_KOBJECT_RELEASE
 	bool "kobject release debugging"
@@ -1980,7 +1980,6 @@ endif # RUNTIME_TESTING_MENU
 
 config MEMTEST
 	bool "Memtest"
-	depends on HAVE_MEMBLOCK
 	---help---
 	  This option adds a kernel parameter 'memtest', which allows memtest
 	  to be set.

mm/Kconfig

@@ -127,9 +127,6 @@ config SPARSEMEM_VMEMMAP
 	 pfn_to_page and page_to_pfn operations.  This is the most
 	 efficient option when sufficient kernel resources are available.
 
-config HAVE_MEMBLOCK
-	bool
-
 config HAVE_MEMBLOCK_NODE_MAP
 	bool
 
@@ -478,7 +475,7 @@ config FRONTSWAP
 
 config CMA
 	bool "Contiguous Memory Allocator"
-	depends on HAVE_MEMBLOCK && MMU
+	depends on MMU
 	select MIGRATION
 	select MEMORY_ISOLATION
 	help

mm/Makefile

@@ -43,11 +43,11 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
 
 obj-y += init-mm.o
 obj-y += nobootmem.o
+obj-y += memblock.o
 
 ifdef CONFIG_MMU
 	obj-$(CONFIG_ADVISE_SYSCALLS)	+= madvise.o
 endif
-obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.o
 
 obj-$(CONFIG_SWAP)	+= page_io.o swap_state.o swapfile.o swap_slots.o
 obj-$(CONFIG_FRONTSWAP)	+= frontswap.o

mm/nobootmem.c

@@ -23,10 +23,6 @@
 
 #include "internal.h"
 
-#ifndef CONFIG_HAVE_MEMBLOCK
-#error CONFIG_HAVE_MEMBLOCK not defined
-#endif
-
 #ifndef CONFIG_NEED_MULTIPLE_NODES
 struct pglist_data __refdata contig_page_data;
 EXPORT_SYMBOL(contig_page_data);

mm/page_alloc.c

@@ -6508,8 +6508,7 @@ void __init free_area_init_node(int nid, unsigned long *zones_size,
 	free_area_init_core(pgdat);
 }
 
-#if defined(CONFIG_HAVE_MEMBLOCK) && !defined(CONFIG_FLAT_NODE_MEM_MAP)
-
+#if !defined(CONFIG_FLAT_NODE_MEM_MAP)
 /*
  * Zero all valid struct pages in range [spfn, epfn), return number of struct
  * pages zeroed
@@ -6569,7 +6568,7 @@ void __init zero_resv_unavail(void)
 	if (pgcnt)
 		pr_info("Zeroed struct page in unavailable ranges: %lld pages", pgcnt);
 }
-#endif /* CONFIG_HAVE_MEMBLOCK && !CONFIG_FLAT_NODE_MEM_MAP */
+#endif /* !CONFIG_FLAT_NODE_MEM_MAP */
 
 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP