Merge tag 'mips_fixes_4.17_1' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips

Pull MIPS fixes from James Hogan:

 - io: Add barriers to read*() & write*()

 - dts: Fix boston PCI bus DTC warnings (4.17)

 - memset: Several corner case fixes (one 3.10, others longer)

* tag 'mips_fixes_4.17_1' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/mips:
  MIPS: uaccess: Add micromips clobbers to bzero invocation
  MIPS: memset.S: Fix clobber of v1 in last_fixup
  MIPS: memset.S: Fix return of __clear_user from Lpartial_fixup
  MIPS: memset.S: EVA & fault support for small_memset
  MIPS: dts: Boston: Fix PCI bus dtc warnings:
  MIPS: io: Add barrier after register read in readX()
  MIPS: io: Prevent compiler reordering writeX()

arch/mips/boot/dts/img/boston.dts

@@ -51,6 +51,8 @@
 		ranges = <0x02000000 0 0x40000000
 			  0x40000000 0 0x40000000>;
 
+		bus-range = <0x00 0xff>;
+
 		interrupt-map-mask = <0 0 0 7>;
 		interrupt-map = <0 0 0 1 &pci0_intc 1>,
 				<0 0 0 2 &pci0_intc 2>,
@@ -79,6 +81,8 @@
 		ranges = <0x02000000 0 0x20000000
 			  0x20000000 0 0x20000000>;
 
+		bus-range = <0x00 0xff>;
+
 		interrupt-map-mask = <0 0 0 7>;
 		interrupt-map = <0 0 0 1 &pci1_intc 1>,
 				<0 0 0 2 &pci1_intc 2>,
@@ -107,6 +111,8 @@
 		ranges = <0x02000000 0 0x16000000
 			  0x16000000 0 0x100000>;
 
+		bus-range = <0x00 0xff>;
+
 		interrupt-map-mask = <0 0 0 7>;
 		interrupt-map = <0 0 0 1 &pci2_intc 1>,
 				<0 0 0 2 &pci2_intc 2>,

arch/mips/include/asm/io.h

@@ -307,7 +307,7 @@ static inline void iounmap(const volatile void __iomem *addr)
 #if defined(CONFIG_CPU_CAVIUM_OCTEON) || defined(CONFIG_LOONGSON3_ENHANCEMENT)
 #define war_io_reorder_wmb()		wmb()
 #else
-#define war_io_reorder_wmb()		do { } while (0)
+#define war_io_reorder_wmb()		barrier()
 #endif
 
 #define __BUILD_MEMORY_SINGLE(pfx, bwlq, type, irq)			\
@@ -377,6 +377,8 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem)	\
 		BUG();							\
 	}								\
 									\
+	/* prevent prefetching of coherent DMA data prematurely */	\
+	rmb();								\
 	return pfx##ioswab##bwlq(__mem, __val);				\
 }
 

arch/mips/include/asm/uaccess.h

@@ -654,6 +654,13 @@ __clear_user(void __user *addr, __kernel_size_t size)
 {
 	__kernel_size_t res;
 
+#ifdef CONFIG_CPU_MICROMIPS
+/* micromips memset / bzero also clobbers t7 & t8 */
+#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$15", "$24", "$31"
+#else
+#define bzero_clobbers "$4", "$5", "$6", __UA_t0, __UA_t1, "$31"
+#endif /* CONFIG_CPU_MICROMIPS */
+
 	if (eva_kernel_access()) {
 		__asm__ __volatile__(
 			"move\t$4, %1\n\t"
@@ -663,7 +670,7 @@ __clear_user(void __user *addr, __kernel_size_t size)
 			"move\t%0, $6"
 			: "=r" (res)
 			: "r" (addr), "r" (size)
-			: "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
+			: bzero_clobbers);
 	} else {
 		might_fault();
 		__asm__ __volatile__(
@@ -674,7 +681,7 @@ __clear_user(void __user *addr, __kernel_size_t size)
 			"move\t%0, $6"
 			: "=r" (res)
 			: "r" (addr), "r" (size)
-			: "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
+			: bzero_clobbers);
 	}
 
 	return res;

arch/mips/lib/memset.S

@@ -219,7 +219,7 @@
 1:	PTR_ADDIU	a0, 1			/* fill bytewise */
 	R10KCBARRIER(0(ra))
 	bne		t1, a0, 1b
-	sb		a1, -1(a0)
+	 EX(sb, a1, -1(a0), .Lsmall_fixup\@)
 
 2:	jr		ra			/* done */
 	move		a2, zero
@@ -252,13 +252,18 @@
 	PTR_L		t0, TI_TASK($28)
 	andi		a2, STORMASK
 	LONG_L		t0, THREAD_BUADDR(t0)
-	LONG_ADDU	a2, t1
+	LONG_ADDU	a2, a0
 	jr		ra
 	LONG_SUBU	a2, t0
 
 .Llast_fixup\@:
 	jr		ra
-	andi		v1, a2, STORMASK
+	 nop
+
+.Lsmall_fixup\@:
+	PTR_SUBU	a2, t1, a0
+	jr		ra
+	 PTR_ADDIU	a2, 1
 
 	.endm