Merge branches 'fixes' and 'misc' into for-next

43 files changed, 819 insertions, 185 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fe2f17eb2b50..2c5eb5c2b310 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -67,6 +67,7 @@ config ARM
 	select HAVE_ARCH_BITREVERSE if (CPU_32v7M || CPU_32v7) && !CPU_32v6
 	select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
 	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
+	select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
 	select HAVE_ARCH_SECCOMP
 	select HAVE_ARCH_SECCOMP_FILTER if AEABI && !OABI_COMPAT
@@ -1323,6 +1324,15 @@ config PAGE_OFFSET
 	default 0xB0000000 if VMSPLIT_3G_OPT
 	default 0xC0000000
 
+config KASAN_SHADOW_OFFSET
+	hex
+	depends on KASAN
+	default 0x1f000000 if PAGE_OFFSET=0x40000000
+	default 0x5f000000 if PAGE_OFFSET=0x80000000
+	default 0x9f000000 if PAGE_OFFSET=0xC0000000
+	default 0x8f000000 if PAGE_OFFSET=0xB0000000
+	default 0xffffffff
+
 config NR_CPUS
 	int "Maximum number of CPUs (2-32)"
 	range 2 32
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 4d76eab2b22d..3c0a64cefe52 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -10,7 +10,7 @@
 #
 # Copyright (C) 1995-2001 by Russell King
 
-LDFLAGS_vmlinux	:= --no-undefined -X --pic-veneer
+LDFLAGS_vmlinux	:= --no-undefined -X --pic-veneer -z norelro
 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
 LDFLAGS_vmlinux	+= --be8
 KBUILD_LDFLAGS_MODULE	+= --be8
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index 47f001ca5499..a815b1ae990d 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -24,6 +24,7 @@ OBJS		+= hyp-stub.o
 endif
 
 GCOV_PROFILE		:= n
+KASAN_SANITIZE		:= n
 
 # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
 KCOV_INSTRUMENT		:= n
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 2e04ec5b5446..8d546cb10921 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -11,6 +11,12 @@
 
 #include "efi-header.S"
 
+#ifdef __ARMEB__
+#define OF_DT_MAGIC 0xd00dfeed
+#else
+#define OF_DT_MAGIC 0xedfe0dd0
+#endif
+
  AR_CLASS(	.arch	armv7-a	)
  M_CLASS(	.arch	armv7-m	)
 
@@ -116,7 +122,7 @@
 		/*
 		 * Debug print of the final appended DTB location
 		 */
-		.macro dbgadtb, begin, end
+		.macro dbgadtb, begin, size
 #ifdef DEBUG
 		kputc   #'D'
 		kputc   #'T'
@@ -129,7 +135,7 @@
 		kputc	#'('
 		kputc	#'0'
 		kputc	#'x'
-		kphex	\end, 8		/* End of appended DTB */
+		kphex	\size, 8	/* Size of appended DTB */
 		kputc	#')'
 		kputc	#'\n'
 #endif
@@ -165,6 +171,16 @@
 		orr	\res, \res, \tmp1, lsl #24
 		.endm
 
+		.macro	be32tocpu, val, tmp
+#ifndef __ARMEB__
+		/* convert to little endian */
+		eor	\tmp, \val, \val, ror #16
+		bic	\tmp, \tmp, #0x00ff0000
+		mov	\val, \val, ror #8
+		eor	\val, \val, \tmp, lsr #8
+#endif
+		.endm
+
 		.section ".start", "ax"
 /*
  * sort out different calling conventions
@@ -325,11 +341,7 @@ restart:	adr	r0, LC1
  */
 
 		ldr	lr, [r6, #0]
-#ifndef __ARMEB__
-		ldr	r1, =0xedfe0dd0		@ sig is 0xd00dfeed big endian
-#else
-		ldr	r1, =0xd00dfeed
-#endif
+		ldr	r1, =OF_DT_MAGIC
 		cmp	lr, r1
 		bne	dtb_check_done		@ not found
 
@@ -345,13 +357,7 @@ restart:	adr	r0, LC1
 
 		/* Get the initial DTB size */
 		ldr	r5, [r6, #4]
-#ifndef __ARMEB__
-		/* convert to little endian */
-		eor	r1, r5, r5, ror #16
-		bic	r1, r1, #0x00ff0000
-		mov	r5, r5, ror #8
-		eor	r5, r5, r1, lsr #8
-#endif
+		be32tocpu r5, r1
 		dbgadtb	r6, r5
 		/* 50% DTB growth should be good enough */
 		add	r5, r5, r5, lsr #1
@@ -403,13 +409,7 @@ restart:	adr	r0, LC1
 
 		/* Get the current DTB size */
 		ldr	r5, [r6, #4]
-#ifndef __ARMEB__
-		/* convert r5 (dtb size) to little endian */
-		eor	r1, r5, r5, ror #16
-		bic	r1, r1, #0x00ff0000
-		mov	r5, r5, ror #8
-		eor	r5, r5, r1, lsr #8
-#endif
+		be32tocpu r5, r1
 
 		/* preserve 64-bit alignment */
 		add	r5, r5, #7
diff --git a/arch/arm/boot/compressed/string.c b/arch/arm/boot/compressed/string.c
index ade5079bebbf..8c0fa276d994 100644
--- a/arch/arm/boot/compressed/string.c
+++ b/arch/arm/boot/compressed/string.c
@@ -7,6 +7,25 @@
 
 #include <linux/string.h>
 
+/*
+ * The decompressor is built without KASan but uses the same redirects as the
+ * rest of the kernel when CONFIG_KASAN is enabled, defining e.g. memcpy()
+ * to __memcpy() but since we are not linking with the main kernel string
+ * library in the decompressor, that will lead to link failures.
+ *
+ * Undefine KASan's versions, define the wrapped functions and alias them to
+ * the right names so that when e.g. __memcpy() appear in the code, it will
+ * still be linked to this local version of memcpy().
+ */
+#ifdef CONFIG_KASAN
+#undef memcpy
+#undef memmove
+#undef memset
+void *__memcpy(void *__dest, __const void *__src, size_t __n) __alias(memcpy);
+void *__memmove(void *__dest, __const void *__src, size_t count) __alias(memmove);
+void *__memset(void *s, int c, size_t count) __alias(memset);
+#endif
+
 void *memcpy(void *__dest, __const void *__src, size_t __n)
 {
 	int i = 0;
diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h
index fc56fc3e1931..9575b404019c 100644
--- a/arch/arm/include/asm/fixmap.h
+++ b/arch/arm/include/asm/fixmap.h
@@ -2,7 +2,7 @@
 #ifndef _ASM_FIXMAP_H
 #define _ASM_FIXMAP_H
 
-#define FIXADDR_START		0xffc00000UL
+#define FIXADDR_START		0xffc80000UL
 #define FIXADDR_END		0xfff00000UL
 #define FIXADDR_TOP		(FIXADDR_END - PAGE_SIZE)
 
diff --git a/arch/arm/include/asm/kasan.h b/arch/arm/include/asm/kasan.h
new file mode 100644
index 000000000000..303c35df3135
--- /dev/null
+++ b/arch/arm/include/asm/kasan.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arch/arm/include/asm/kasan.h
+ *
+ * Copyright (c) 2015 Samsung Electronics Co., Ltd.
+ * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
+ *
+ */
+
+#ifndef __ASM_KASAN_H
+#define __ASM_KASAN_H
+
+#ifdef CONFIG_KASAN
+
+#include <asm/kasan_def.h>
+
+#define KASAN_SHADOW_SCALE_SHIFT 3
+
+/*
+ * The compiler uses a shadow offset assuming that addresses start
+ * from 0. Kernel addresses don't start from 0, so shadow
+ * for kernel really starts from 'compiler's shadow offset' +
+ * ('kernel address space start' >> KASAN_SHADOW_SCALE_SHIFT)
+ */
+
+asmlinkage void kasan_early_init(void);
+extern void kasan_init(void);
+
+#else
+static inline void kasan_init(void) { }
+#endif
+
+#endif
diff --git a/arch/arm/include/asm/kasan_def.h b/arch/arm/include/asm/kasan_def.h
new file mode 100644
index 000000000000..5739605aa7cf
--- /dev/null
+++ b/arch/arm/include/asm/kasan_def.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *  arch/arm/include/asm/kasan_def.h
+ *
+ *  Copyright (c) 2018 Huawei Technologies Co., Ltd.
+ *
+ *  Author: Abbott Liu <liuwenliang@huawei.com>
+ */
+
+#ifndef __ASM_KASAN_DEF_H
+#define __ASM_KASAN_DEF_H
+
+#ifdef CONFIG_KASAN
+
+/*
+ * Define KASAN_SHADOW_OFFSET,KASAN_SHADOW_START and KASAN_SHADOW_END for
+ * the Arm kernel address sanitizer. We are "stealing" lowmem (the 4GB
+ * addressable by a 32bit architecture) out of the virtual address
+ * space to use as shadow memory for KASan as follows:
+ *
+ * +----+ 0xffffffff
+ * |    |							\
+ * |    | |-> Static kernel image (vmlinux) BSS and page table
+ * |    |/
+ * +----+ PAGE_OFFSET
+ * |    |							\
+ * |    | |->  Loadable kernel modules virtual address space area
+ * |    |/
+ * +----+ MODULES_VADDR = KASAN_SHADOW_END
+ * |    |						\
+ * |    | |-> The shadow area of kernel virtual address.
+ * |    |/
+ * +----+->  TASK_SIZE (start of kernel space) = KASAN_SHADOW_START the
+ * |    |\   shadow address of MODULES_VADDR
+ * |    | |
+ * |    | |
+ * |    | |-> The user space area in lowmem. The kernel address
+ * |    | |   sanitizer do not use this space, nor does it map it.
+ * |    | |
+ * |    | |
+ * |    | |
+ * |    | |
+ * |    |/
+ * ------ 0
+ *
+ * 1) KASAN_SHADOW_START
+ *   This value begins with the MODULE_VADDR's shadow address. It is the
+ *   start of kernel virtual space. Since we have modules to load, we need
+ *   to cover also that area with shadow memory so we can find memory
+ *   bugs in modules.
+ *
+ * 2) KASAN_SHADOW_END
+ *   This value is the 0x100000000's shadow address: the mapping that would
+ *   be after the end of the kernel memory at 0xffffffff. It is the end of
+ *   kernel address sanitizer shadow area. It is also the start of the
+ *   module area.
+ *
+ * 3) KASAN_SHADOW_OFFSET:
+ *   This value is used to map an address to the corresponding shadow
+ *   address by the following formula:
+ *
+ *	shadow_addr = (address >> 3) + KASAN_SHADOW_OFFSET;
+ *
+ *  As you would expect, >> 3 is equal to dividing by 8, meaning each
+ *  byte in the shadow memory covers 8 bytes of kernel memory, so one
+ *  bit shadow memory per byte of kernel memory is used.
+ *
+ *  The KASAN_SHADOW_OFFSET is provided in a Kconfig option depending
+ *  on the VMSPLIT layout of the system: the kernel and userspace can
+ *  split up lowmem in different ways according to needs, so we calculate
+ *  the shadow offset depending on this.
+ */
+
+#define KASAN_SHADOW_SCALE_SHIFT	3
+#define KASAN_SHADOW_OFFSET	_AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
+#define KASAN_SHADOW_END	((UL(1) << (32 - KASAN_SHADOW_SCALE_SHIFT)) \
+				 + KASAN_SHADOW_OFFSET)
+#define KASAN_SHADOW_START      ((KASAN_SHADOW_END >> 3) + KASAN_SHADOW_OFFSET)
+
+#endif
+#endif
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 99035b5891ef..38a163f50130 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -18,6 +18,7 @@
 #ifdef CONFIG_NEED_MACH_MEMORY_H
 #include <mach/memory.h>
 #endif
+#include <asm/kasan_def.h>
 
 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
 #define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET)
@@ -28,7 +29,11 @@
  * TASK_SIZE - the maximum size of a user space task.
  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  */
+#ifndef CONFIG_KASAN
 #define TASK_SIZE		(UL(CONFIG_PAGE_OFFSET) - UL(SZ_16M))
+#else
+#define TASK_SIZE		(KASAN_SHADOW_START)
+#endif
 #define TASK_UNMAPPED_BASE	ALIGN(TASK_SIZE / 3, SZ_16M)
 
 /*
@@ -67,6 +72,10 @@
  */
 #define XIP_VIRT_ADDR(physaddr)  (MODULES_VADDR + ((physaddr) & 0x000fffff))
 
+#define FDT_FIXED_BASE		UL(0xff800000)
+#define FDT_FIXED_SIZE		(2 * SECTION_SIZE)
+#define FDT_VIRT_BASE(physbase)	((void *)(FDT_FIXED_BASE | (physbase) % SECTION_SIZE))
+
 #if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
 /*
  * Allow 16MB-aligned ioremap pages
@@ -107,6 +116,7 @@ extern unsigned long vectors_base;
 #define MODULES_VADDR		PAGE_OFFSET
 
 #define XIP_VIRT_ADDR(physaddr)  (physaddr)
+#define FDT_VIRT_BASE(physbase)  ((void *)(physbase))
 
 #endif /* !CONFIG_MMU */
 
diff --git a/arch/arm/include/asm/pgalloc.h b/arch/arm/include/asm/pgalloc.h
index 15f4674715f8..fdee1f04f4f3 100644
--- a/arch/arm/include/asm/pgalloc.h
+++ b/arch/arm/include/asm/pgalloc.h
@@ -21,6 +21,7 @@
 #define _PAGE_KERNEL_TABLE	(PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
 
 #ifdef CONFIG_ARM_LPAE
+#define PGD_SIZE		(PTRS_PER_PGD * sizeof(pgd_t))
 
 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 {
@@ -28,14 +29,19 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 }
 
 #else	/* !CONFIG_ARM_LPAE */
+#define PGD_SIZE		(PAGE_SIZE << 2)
 
 /*
  * Since we have only two-level page tables, these are trivial
  */
 #define pmd_alloc_one(mm,addr)		({ BUG(); ((pmd_t *)2); })
 #define pmd_free(mm, pmd)		do { } while (0)
+#ifdef CONFIG_KASAN
+/* The KASan core unconditionally calls pud_populate() on all architectures */
+#define pud_populate(mm,pmd,pte)	do { } while (0)
+#else
 #define pud_populate(mm,pmd,pte)	BUG()
-
+#endif
 #endif	/* CONFIG_ARM_LPAE */
 
 extern pgd_t *pgd_alloc(struct mm_struct *mm);
diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h
index 3502c2f746ca..9d4f5eef410b 100644
--- a/arch/arm/include/asm/pgtable-2level.h
+++ b/arch/arm/include/asm/pgtable-2level.h
@@ -177,11 +177,28 @@
  * the pud: the pud entry is never bad, always exists, and can't be set or
  * cleared.
  */
-#define pud_none(pud)		(0)
-#define pud_bad(pud)		(0)
-#define pud_present(pud)	(1)
-#define pud_clear(pudp)		do { } while (0)
-#define set_pud(pud,pudp)	do { } while (0)
+static inline int pud_none(pud_t pud)
+{
+	return 0;
+}
+
+static inline int pud_bad(pud_t pud)
+{
+	return 0;
+}
+
+static inline int pud_present(pud_t pud)
+{
+	return 1;
+}
+
+static inline void pud_clear(pud_t *pudp)
+{
+}
+
+static inline void set_pud(pud_t *pudp, pud_t pud)
+{
+}
 
 static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
 {
diff --git a/arch/arm/include/asm/prom.h b/arch/arm/include/asm/prom.h
index 1e36c40533c1..402e3f34c7ed 100644
--- a/arch/arm/include/asm/prom.h
+++ b/arch/arm/include/asm/prom.h
@@ -9,12 +9,12 @@
 
 #ifdef CONFIG_OF
 
-extern const struct machine_desc *setup_machine_fdt(unsigned int dt_phys);
+extern const struct machine_desc *setup_machine_fdt(void *dt_virt);
 extern void __init arm_dt_init_cpu_maps(void);
 
 #else /* CONFIG_OF */
 
-static inline const struct machine_desc *setup_machine_fdt(unsigned int dt_phys)
+static inline const struct machine_desc *setup_machine_fdt(void *dt_virt)
 {
 	return NULL;
 }
diff --git a/arch/arm/include/asm/string.h b/arch/arm/include/asm/string.h
index 111a1d8a41dd..6c607c68f3ad 100644
--- a/arch/arm/include/asm/string.h
+++ b/arch/arm/include/asm/string.h
@@ -5,6 +5,9 @@
 /*
  * We don't do inline string functions, since the
  * optimised inline asm versions are not small.
+ *
+ * The __underscore versions of some functions are for KASan to be able
+ * to replace them with instrumented versions.
  */
 
 #define __HAVE_ARCH_STRRCHR
@@ -15,15 +18,18 @@ extern char * strchr(const char * s, int c);
 
 #define __HAVE_ARCH_MEMCPY
 extern void * memcpy(void *, const void *, __kernel_size_t);
+extern void *__memcpy(void *dest, const void *src, __kernel_size_t n);
 
 #define __HAVE_ARCH_MEMMOVE
 extern void * memmove(void *, const void *, __kernel_size_t);
+extern void *__memmove(void *dest, const void *src, __kernel_size_t n);
 
 #define __HAVE_ARCH_MEMCHR
 extern void * memchr(const void *, int, __kernel_size_t);
 
 #define __HAVE_ARCH_MEMSET
 extern void * memset(void *, int, __kernel_size_t);
+extern void *__memset(void *s, int c, __kernel_size_t n);
 
 #define __HAVE_ARCH_MEMSET32
 extern void *__memset32(uint32_t *, uint32_t v, __kernel_size_t);
@@ -39,4 +45,24 @@ static inline void *memset64(uint64_t *p, uint64_t v, __kernel_size_t n)
 	return __memset64(p, v, n * 8, v >> 32);
 }
 
+/*
+ * For files that are not instrumented (e.g. mm/slub.c) we
+ * must use non-instrumented versions of the mem*
+ * functions named __memcpy() etc. All such kernel code has
+ * been tagged with KASAN_SANITIZE_file.o = n, which means
+ * that the address sanitization argument isn't passed to the
+ * compiler, and __SANITIZE_ADDRESS__ is not set. As a result
+ * these defines kick in.
+ */
+#if defined(CONFIG_KASAN) && !defined(__SANITIZE_ADDRESS__)
+#define memcpy(dst, src, len) __memcpy(dst, src, len)
+#define memmove(dst, src, len) __memmove(dst, src, len)
+#define memset(s, c, n) __memset(s, c, n)
+
+#ifndef __NO_FORTIFY
+#define __NO_FORTIFY /* FORTIFY_SOURCE uses __builtin_memcpy, etc. */
+#endif
+
+#endif
+
 #endif
diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index 536b6b979f63..56fae7861fd3 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -13,7 +13,15 @@
 #include <asm/fpstate.h>
 #include <asm/page.h>
 
+#ifdef CONFIG_KASAN
+/*
+ * KASan uses a lot of extra stack space so the thread size order needs to
+ * be increased.
+ */
+#define THREAD_SIZE_ORDER	2
+#else
 #define THREAD_SIZE_ORDER	1
+#endif
 #define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
 #define THREAD_START_SP		(THREAD_SIZE - 8)
 
diff --git a/arch/arm/include/asm/uaccess-asm.h b/arch/arm/include/asm/uaccess-asm.h
index 907571fd05c6..e6eb7a2aaf1e 100644
--- a/arch/arm/include/asm/uaccess-asm.h
+++ b/arch/arm/include/asm/uaccess-asm.h
@@ -85,7 +85,7 @@
 	 */
 	.macro	uaccess_entry, tsk, tmp0, tmp1, tmp2, disable
 	ldr	\tmp1, [\tsk, #TI_ADDR_LIMIT]
-	mov	\tmp2, #TASK_SIZE
+	ldr	\tmp2, =TASK_SIZE
 	str	\tmp2, [\tsk, #TI_ADDR_LIMIT]
  DACR(	mrc	p15, 0, \tmp0, c3, c0, 0)
  DACR(	str	\tmp0, [sp, #SVC_DACR])
diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 89e5d864e923..f6431b46866e 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -21,6 +21,9 @@ obj-y		:= elf.o entry-common.o irq.o opcodes.o \
 		   setup.o signal.o sigreturn_codes.o \
 		   stacktrace.o sys_arm.o time.o traps.o
 
+KASAN_SANITIZE_stacktrace.o := n
+KASAN_SANITIZE_traps.o := n
+
 ifneq ($(CONFIG_ARM_UNWIND),y)
 obj-$(CONFIG_FRAME_POINTER)	+= return_address.o
 endif
diff --git a/arch/arm/kernel/atags.h b/arch/arm/kernel/atags.h
index 067e12edc341..f2819c25b602 100644
--- a/arch/arm/kernel/atags.h
+++ b/arch/arm/kernel/atags.h
@@ -2,11 +2,11 @@
 void convert_to_tag_list(struct tag *tags);
 
 #ifdef CONFIG_ATAGS
-const struct machine_desc *setup_machine_tags(phys_addr_t __atags_pointer,
+const struct machine_desc *setup_machine_tags(void *__atags_vaddr,
 	unsigned int machine_nr);
 #else
 static inline const struct machine_desc * __init __noreturn
-setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr)
+setup_machine_tags(void *__atags_vaddr, unsigned int machine_nr)
 {
 	early_print("no ATAGS support: can't continue\n");
 	while (true);
diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c
index 6c12d9fe694e..373b61f9a4f0 100644
--- a/arch/arm/kernel/atags_parse.c
+++ b/arch/arm/kernel/atags_parse.c
@@ -174,7 +174,7 @@ static void __init squash_mem_tags(struct tag *tag)
 }
 
 const struct machine_desc * __init
-setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr)
+setup_machine_tags(void *atags_vaddr, unsigned int machine_nr)
 {
 	struct tag *tags = (struct tag *)&default_tags;
 	const struct machine_desc *mdesc = NULL, *p;
@@ -195,8 +195,8 @@ setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr)
 	if (!mdesc)
 		return NULL;
 
-	if (__atags_pointer)
-		tags = phys_to_virt(__atags_pointer);
+	if (atags_vaddr)
+		tags = atags_vaddr;
 	else if (mdesc->atag_offset)
 		tags = (void *)(PAGE_OFFSET + mdesc->atag_offset);
 
diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
index 7f0745a97e20..28311dd0fee6 100644
--- a/arch/arm/kernel/devtree.c
+++ b/arch/arm/kernel/devtree.c
@@ -203,12 +203,12 @@ static const void * __init arch_get_next_mach(const char *const **match)
 
 /**
  * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
- * @dt_phys: physical address of dt blob
+ * @dt_virt: virtual address of dt blob
  *
  * If a dtb was passed to the kernel in r2, then use it to choose the
  * correct machine_desc and to setup the system.
  */
-const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
+const struct machine_desc * __init setup_machine_fdt(void *dt_virt)
 {
 	const struct machine_desc *mdesc, *mdesc_best = NULL;
 
@@ -221,7 +221,7 @@ const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
 	mdesc_best = &__mach_desc_GENERIC_DT;
 #endif
 
-	if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys)))
+	if (!dt_virt || !early_init_dt_verify(dt_virt))
 		return NULL;
 
 	mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 55a47df04773..0ea8529a4872 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -252,31 +252,10 @@ __und_svc:
 #else
 	svc_entry
 #endif
-	@
-	@ call emulation code, which returns using r9 if it has emulated
-	@ the instruction, or the more conventional lr if we are to treat
-	@ this as a real undefined instruction
-	@
-	@  r0 - instruction
-	@
-#ifndef CONFIG_THUMB2_KERNEL
-	ldr	r0, [r4, #-4]
-#else
-	mov	r1, #2
-	ldrh	r0, [r4, #-2]			@ Thumb instruction at LR - 2
-	cmp	r0, #0xe800			@ 32-bit instruction if xx >= 0
-	blo	__und_svc_fault
-	ldrh	r9, [r4]			@ bottom 16 bits
-	add	r4, r4, #2
-	str	r4, [sp, #S_PC]
-	orr	r0, r9, r0, lsl #16
-#endif
-	badr	r9, __und_svc_finish
-	mov	r2, r4
-	bl	call_fpe
 
 	mov	r1, #4				@ PC correction to apply
-__und_svc_fault:
+ THUMB(	tst	r5, #PSR_T_BIT		)	@ exception taken in Thumb mode?
+ THUMB(	movne	r1, #2			)	@ if so, fix up PC correction
 	mov	r0, sp				@ struct pt_regs *regs
 	bl	__und_fault
 
@@ -427,7 +406,8 @@ ENDPROC(__fiq_abt)
 	@ if it was interrupted in a critical region.  Here we
 	@ perform a quick test inline since it should be false
 	@ 99.9999% of the time.  The rest is done out of line.
-	cmp	r4, #TASK_SIZE
+	ldr	r0, =TASK_SIZE
+	cmp	r4, r0
 	blhs	kuser_cmpxchg64_fixup
 #endif
 #endif
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 271cb8a1eba1..fee279e28a72 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -50,7 +50,8 @@ __ret_fast_syscall:
  UNWIND(.cantunwind	)
 	disable_irq_notrace			@ disable interrupts
 	ldr	r2, [tsk, #TI_ADDR_LIMIT]
-	cmp	r2, #TASK_SIZE
+	ldr	r1, =TASK_SIZE
+	cmp	r2, r1
 	blne	addr_limit_check_failed
 	ldr	r1, [tsk, #TI_FLAGS]		@ re-check for syscall tracing
 	tst	r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
@@ -87,7 +88,8 @@ __ret_fast_syscall:
 #endif
 	disable_irq_notrace			@ disable interrupts
 	ldr	r2, [tsk, #TI_ADDR_LIMIT]
-	cmp	r2, #TASK_SIZE
+	ldr     r1, =TASK_SIZE
+	cmp     r2, r1
 	blne	addr_limit_check_failed
 	ldr	r1, [tsk, #TI_FLAGS]		@ re-check for syscall tracing
 	tst	r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK
@@ -128,7 +130,8 @@ ret_slow_syscall:
 	disable_irq_notrace			@ disable interrupts
 ENTRY(ret_to_user_from_irq)
 	ldr	r2, [tsk, #TI_ADDR_LIMIT]
-	cmp	r2, #TASK_SIZE
+	ldr     r1, =TASK_SIZE
+	cmp	r2, r1
 	blne	addr_limit_check_failed
 	ldr	r1, [tsk, #TI_FLAGS]
 	tst	r1, #_TIF_WORK_MASK
diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S
index 4a3982812a40..89c80154b9ef 100644
--- a/arch/arm/kernel/head-common.S
+++ b/arch/arm/kernel/head-common.S
@@ -95,7 +95,7 @@ __mmap_switched:
  THUMB(	ldmia	r4!, {r0, r1, r2, r3} )
  THUMB(	mov	sp, r3 )
 	sub	r2, r2, r1
-	bl	memcpy				@ copy .data to RAM
+	bl	__memcpy			@ copy .data to RAM
 #endif
 
    ARM(	ldmia	r4!, {r0, r1, sp} )
@@ -103,7 +103,7 @@ __mmap_switched:
  THUMB(	mov	sp, r3 )
 	sub	r2, r1, r0
 	mov	r1, #0
-	bl	memset				@ clear .bss
+	bl	__memset			@ clear .bss
 
 	ldmia	r4, {r0, r1, r2, r3}
 	str	r9, [r0]			@ Save processor ID