22 files changed, 258 insertions, 82 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 138248999df7..2424d1648c65 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -23,6 +23,7 @@ config ARM
 	select ARCH_HAS_TEARDOWN_DMA_OPS if MMU
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAVE_CUSTOM_GPIO_H
+	select ARCH_HAVE_NMI_SAFE_CMPXCHG if CPU_V7 || CPU_V7M || CPU_V6K
 	select ARCH_HAS_GCOV_PROFILE_ALL
 	select ARCH_KEEP_MEMBLOCK
 	select ARCH_MIGHT_HAVE_PC_PARPORT
@@ -1875,9 +1876,10 @@ config AUTO_ZRELADDR
 	help
 	  ZRELADDR is the physical address where the decompressed kernel
 	  image will be placed. If AUTO_ZRELADDR is selected, the address
-	  will be determined at run-time by masking the current IP with
-	  0xf8000000. This assumes the zImage being placed in the first 128MB
-	  from start of memory.
+	  will be determined at run-time, either by masking the current IP
+	  with 0xf8000000, or, if invalid, from the DTB passed in r2.
+	  This assumes the zImage being placed in the first 128MB from
+	  start of memory.
 
 config EFI_STUB
 	bool
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 4ff04201a8cc..7a8697a97c98 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1192,10 +1192,9 @@ choice
 		  Say Y here if you want kernel low-level debugging support
 		  on ST SPEAr13xx based platforms.
 
-	config STIH41X_DEBUG_ASC2
+	config DEBUG_STIH41X_ASC2
 		bool "Use StiH415/416 ASC2 UART for low-level debug"
 		depends on ARCH_STI
-		select DEBUG_STI_UART
 		help
 		  Say Y here if you want kernel low-level debugging support
 		  on STiH415/416 based platforms like b2000, which has
@@ -1203,10 +1202,9 @@ choice
 
 		  If unsure, say N.
 
-	config STIH41X_DEBUG_SBC_ASC1
+	config DEBUG_STIH41X_SBC_ASC1
 		bool "Use StiH415/416 SBC ASC1 UART for low-level debug"
 		depends on ARCH_STI
-		select DEBUG_STI_UART
 		help
 		  Say Y here if you want kernel low-level debugging support
 		  on STiH415/416 based platforms like b2020. which has
@@ -1214,6 +1212,16 @@ choice
 
 		  If unsure, say N.
 
+	config DEBUG_STIH418_SBC_ASC0
+		bool "Use StiH418 SBC ASC0 UART for low-level debug"
+		depends on ARCH_STI
+		help
+		  Say Y here if you want kernel low-level debugging support
+		  on STiH418 based platforms which has default UART wired
+		  up to SBC ASC0.
+
+		  If unsure, say N.
+
 	config STM32F4_DEBUG_UART
 		bool "Use STM32F4 UART for low-level debug"
 		depends on MACH_STM32F429 || MACH_STM32F469
@@ -1552,10 +1560,6 @@ config DEBUG_TEGRA_UART
 	bool
 	depends on ARCH_TEGRA
 
-config DEBUG_STI_UART
-	bool
-	depends on ARCH_STI
-
 config DEBUG_STM32_UART
 	bool
 	depends on ARCH_STM32
@@ -1620,7 +1624,9 @@ config DEBUG_LL_INCLUDE
 	default "debug/s3c24xx.S" if DEBUG_S3C24XX_UART || DEBUG_S3C64XX_UART
 	default "debug/s5pv210.S" if DEBUG_S5PV210_UART
 	default "debug/sirf.S" if DEBUG_SIRFSOC_UART
-	default "debug/sti.S" if DEBUG_STI_UART
+	default "debug/sti.S" if DEBUG_STIH41X_ASC2
+	default "debug/sti.S" if DEBUG_STIH41X_SBC_ASC1
+	default "debug/sti.S" if DEBUG_STIH418_SBC_ASC0
 	default "debug/stm32.S" if DEBUG_STM32_UART
 	default "debug/tegra.S" if DEBUG_TEGRA_UART
 	default "debug/ux500.S" if DEBUG_UX500_UART
@@ -1654,6 +1660,7 @@ config DEBUG_UART_PHYS
 	default 0x03010fe0 if ARCH_RPC
 	default 0x07000000 if DEBUG_SUN9I_UART0
 	default 0x09405000 if DEBUG_ZTE_ZX
+	default 0x09530000 if DEBUG_STIH418_SBC_ASC0
 	default 0x10009000 if DEBUG_REALVIEW_STD_PORT || \
 				DEBUG_VEXPRESS_UART0_CA9
 	default 0x1010c000 if DEBUG_REALVIEW_PB1176_PORT
@@ -1752,7 +1759,9 @@ config DEBUG_UART_PHYS
 	default 0xfc00c000 if DEBUG_AT91_SAMA5D4_USART3
 	default 0xfcb00000 if DEBUG_HI3620_UART
 	default 0xfd883000 if DEBUG_ALPINE_UART0
+	default 0xfe531000 if DEBUG_STIH41X_SBC_ASC1
 	default 0xfe800000 if ARCH_IOP32X
+	default 0xfed32000 if DEBUG_STIH41X_ASC2
 	default 0xff690000 if DEBUG_RK32_UART2
 	default 0xffc02000 if DEBUG_SOCFPGA_UART0
 	default 0xffc02100 if DEBUG_SOCFPGA_ARRIA10_UART1
@@ -1781,7 +1790,9 @@ config DEBUG_UART_PHYS
 		DEBUG_S3C64XX_UART || \
 		DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
 		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
-		DEBUG_AT91_UART || DEBUG_STM32_UART
+		DEBUG_AT91_UART || DEBUG_STM32_UART || \
+		DEBUG_STIH41X_ASC2 || DEBUG_STIH41X_SBC_ASC1 || \
+		DEBUG_STIH418_SBC_ASC0
 
 config DEBUG_UART_VIRT
 	hex "Virtual base address of debug UART"
@@ -1826,6 +1837,7 @@ config DEBUG_UART_VIRT
 	default 0xf8090000 if DEBUG_VEXPRESS_UART0_RS1
 	default 0xf8ffee00 if DEBUG_AT91_SAM9263_DBGU
 	default 0xf8fff200 if DEBUG_AT91_RM9200_DBGU
+	default 0xf9530000 if DEBUG_STIH418_SBC_ASC0
 	default 0xf9e09000 if DEBUG_AM33XXUART1
 	default 0xfa020000 if DEBUG_OMAP4UART3 || DEBUG_TI81XXUART1
 	default 0xfa022000 if DEBUG_TI81XXUART2
@@ -1845,7 +1857,9 @@ config DEBUG_UART_VIRT
 	default 0xfc705000 if DEBUG_ZTE_ZX
 	default 0xfcfe8600 if DEBUG_BCM63XX_UART
 	default 0xfd000000 if DEBUG_SPEAR3XX || DEBUG_SPEAR13XX
+	default 0xfd531000 if DEBUG_STIH41X_SBC_ASC1
 	default 0xfd883000 if DEBUG_ALPINE_UART0
+	default 0xfdd32000 if DEBUG_STIH41X_ASC2
 	default 0xfe010000 if STM32MP1_DEBUG_UART
 	default 0xfe017000 if DEBUG_MMP_UART2
 	default 0xfe018000 if DEBUG_MMP_UART3
@@ -1891,7 +1905,9 @@ config DEBUG_UART_VIRT
 		DEBUG_S3C64XX_UART || \
 		DEBUG_BCM63XX_UART || DEBUG_ASM9260_UART || \
 		DEBUG_SIRFSOC_UART || DEBUG_DIGICOLOR_UA0 || \
-		DEBUG_AT91_UART || DEBUG_STM32_UART
+		DEBUG_AT91_UART || DEBUG_STM32_UART || \
+		DEBUG_STIH41X_ASC2 || DEBUG_STIH41X_SBC_ASC1 || \
+		DEBUG_STIH418_SBC_ASC0
 
 config DEBUG_UART_8250_SHIFT
 	int "Register offset shift for the 8250 debug UART"
@@ -1926,7 +1942,7 @@ config DEBUG_UNCOMPRESS
 	depends on ARCH_MULTIPLATFORM || PLAT_SAMSUNG || ARM_SINGLE_ARMV7M
 	depends on DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
 		     (!DEBUG_TEGRA_UART || !ZBOOT_ROM) && \
-		     !DEBUG_BRCMSTB_UART
+		     !DEBUG_BRCMSTB_UART && !DEBUG_SEMIHOSTING
 	help
 	  This option influences the normal decompressor output for
 	  multiplatform kernels.  Normally, multiplatform kernels disable
diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
index fb521efcc6c2..fd94e27ba4fa 100644
--- a/arch/arm/boot/compressed/Makefile
+++ b/arch/arm/boot/compressed/Makefile
@@ -87,10 +87,13 @@ libfdt_objs := fdt_rw.o fdt_ro.o fdt_wip.o fdt.o
 ifeq ($(CONFIG_ARM_ATAG_DTB_COMPAT),y)
 OBJS	+= $(libfdt_objs) atags_to_fdt.o
 endif
+ifeq ($(CONFIG_USE_OF),y)
+OBJS	+= $(libfdt_objs) fdt_check_mem_start.o
+endif
 
 # -fstack-protector-strong triggers protection checks in this code,
 # but it is being used too early to link to meaningful stack_chk logic.
-$(foreach o, $(libfdt_objs) atags_to_fdt.o, \
+$(foreach o, $(libfdt_objs) atags_to_fdt.o fdt_check_mem_start.o, \
 	$(eval CFLAGS_$(o) := -I $(srctree)/scripts/dtc/libfdt -fno-stack-protector))
 
 # These were previously generated C files. When you are building the kernel
diff --git a/arch/arm/boot/compressed/fdt_check_mem_start.c b/arch/arm/boot/compressed/fdt_check_mem_start.c
new file mode 100644
index 000000000000..62450d824c3c
--- /dev/null
+++ b/arch/arm/boot/compressed/fdt_check_mem_start.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/kernel.h>
+#include <linux/libfdt.h>
+#include <linux/sizes.h>
+
+static const void *get_prop(const void *fdt, const char *node_path,
+			    const char *property, int minlen)
+{
+	const void *prop;
+	int offset, len;
+
+	offset = fdt_path_offset(fdt, node_path);
+	if (offset < 0)
+		return NULL;
+
+	prop = fdt_getprop(fdt, offset, property, &len);
+	if (!prop || len < minlen)
+		return NULL;
+
+	return prop;
+}
+
+static uint32_t get_cells(const void *fdt, const char *name)
+{
+	const fdt32_t *prop = get_prop(fdt, "/", name, sizeof(fdt32_t));
+
+	if (!prop) {
+		/* default */
+		return 1;
+	}
+
+	return fdt32_ld(prop);
+}
+
+static uint64_t get_val(const fdt32_t *cells, uint32_t ncells)
+{
+	uint64_t r;
+
+	r = fdt32_ld(cells);
+	if (ncells > 1)
+		r = (r << 32) | fdt32_ld(cells + 1);
+
+	return r;
+}
+
+/*
+ * Check the start of physical memory
+ *
+ * Traditionally, the start address of physical memory is obtained by masking
+ * the program counter.  However, this does require that this address is a
+ * multiple of 128 MiB, precluding booting Linux on platforms where this
+ * requirement is not fulfilled.
+ * Hence validate the calculated address against the memory information in the
+ * DTB, and, if out-of-range, replace it by the real start address.
+ * To preserve backwards compatibility (systems reserving a block of memory
+ * at the start of physical memory, kdump, ...), the traditional method is
+ * always used if it yields a valid address.
+ *
+ * Return value: start address of physical memory to use
+ */
+uint32_t fdt_check_mem_start(uint32_t mem_start, const void *fdt)
+{
+	uint32_t addr_cells, size_cells, base;
+	uint32_t fdt_mem_start = 0xffffffff;
+	const fdt32_t *reg, *endp;
+	uint64_t size, end;
+	const char *type;
+	int offset, len;
+
+	if (!fdt)
+		return mem_start;
+
+	if (fdt_magic(fdt) != FDT_MAGIC)
+		return mem_start;
+
+	/* There may be multiple cells on LPAE platforms */
+	addr_cells = get_cells(fdt, "#address-cells");
+	size_cells = get_cells(fdt, "#size-cells");
+	if (addr_cells > 2 || size_cells > 2)
+		return mem_start;
+
+	/* Walk all memory nodes and regions */
+	for (offset = fdt_next_node(fdt, -1, NULL); offset >= 0;
+	     offset = fdt_next_node(fdt, offset, NULL)) {
+		type = fdt_getprop(fdt, offset, "device_type", NULL);
+		if (!type || strcmp(type, "memory"))
+			continue;
+
+		reg = fdt_getprop(fdt, offset, "linux,usable-memory", &len);
+		if (!reg)
+			reg = fdt_getprop(fdt, offset, "reg", &len);
+		if (!reg)
+			continue;
+
+		for (endp = reg + (len / sizeof(fdt32_t));
+		     endp - reg >= addr_cells + size_cells;
+		     reg += addr_cells + size_cells) {
+			size = get_val(reg + addr_cells, size_cells);
+			if (!size)
+				continue;
+
+			if (addr_cells > 1 && fdt32_ld(reg)) {
+				/* Outside 32-bit address space, skipping */
+				continue;
+			}
+
+			base = fdt32_ld(reg + addr_cells - 1);
+			end = base + size;
+			if (mem_start >= base && mem_start < end) {
+				/* Calculated address is valid, use it */
+				return mem_start;
+			}
+
+			if (base < fdt_mem_start)
+				fdt_mem_start = base;
+		}
+	}
+
+	if (fdt_mem_start == 0xffffffff) {
+		/* No usable memory found, falling back to default */
+		return mem_start;
+	}
+
+	/*
+	 * The calculated address is not usable.
+	 * Use the lowest usable physical memory address from the DTB instead,
+	 * and make sure this is a multiple of 2 MiB for phys/virt patching.
+	 */
+	return round_up(fdt_mem_start, SZ_2M);
+}
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index d9cce7238a36..b1cb1972361b 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -174,10 +174,7 @@
 		.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
+		rev_l	\val, \tmp
 #endif
 		.endm
 
@@ -282,10 +279,40 @@ not_angel:
 		 * are already placing their zImage in (eg) the top 64MB
 		 * of this range.
 		 */
-		mov	r4, pc
-		and	r4, r4, #0xf8000000
+		mov	r0, pc
+		and	r0, r0, #0xf8000000
+#ifdef CONFIG_USE_OF
+		adr	r1, LC1
+#ifdef CONFIG_ARM_APPENDED_DTB
+		/*
+		 * Look for an appended DTB.  If found, we cannot use it to
+		 * validate the calculated start of physical memory, as its
+		 * memory nodes may need to be augmented by ATAGS stored at
+		 * an offset from the same start of physical memory.
+		 */
+		ldr	r2, [r1, #4]	@ get &_edata
+		add	r2, r2, r1	@ relocate it
+		ldr	r2, [r2]	@ get DTB signature
+		ldr	r3, =OF_DT_MAGIC
+		cmp	r2, r3		@ do we have a DTB there?
+		beq	1f		@ if yes, skip validation
+#endif /* CONFIG_ARM_APPENDED_DTB */
+
+		/*
+		 * Make sure we have some stack before calling C code.
+		 * No GOT fixup has occurred yet, but none of the code we're
+		 * about to call uses any global variables.
+		 */
+		ldr	sp, [r1]	@ get stack location
+		add	sp, sp, r1	@ apply relocation
+
+		/* Validate calculated start against passed DTB */
+		mov	r1, r8
+		bl	fdt_check_mem_start
+1:
+#endif /* CONFIG_USE_OF */
 		/* Determine final kernel image address. */
-		add	r4, r4, #TEXT_OFFSET
+		add	r4, r0, #TEXT_OFFSET
 #else
 		ldr	r4, =zreladdr
 #endif
@@ -1164,9 +1191,9 @@ __armv4_mmu_cache_off:
 __armv7_mmu_cache_off:
 		mrc	p15, 0, r0, c1, c0
 #ifdef CONFIG_MMU
-		bic	r0, r0, #0x000d
+		bic	r0, r0, #0x0005
 #else
-		bic	r0, r0, #0x000c
+		bic	r0, r0, #0x0004
 #endif
 		mcr	p15, 0, r0, c1, c0	@ turn MMU and cache off
 		mov	r0, #0
diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
index 62f241b09fe3..e45f4e4e06b6 100644
--- a/arch/arm/common/locomo.c
+++ b/arch/arm/common/locomo.c
@@ -838,11 +838,10 @@ static int locomo_bus_remove(struct device *dev)
 {
 	struct locomo_dev *ldev = LOCOMO_DEV(dev);
 	struct locomo_driver *drv = LOCOMO_DRV(dev->driver);
-	int ret = 0;
 
 	if (drv->remove)
-		ret = drv->remove(ldev);
-	return ret;
+		drv->remove(ldev);
+	return 0;
 }
 
 struct bus_type locomo_bus_type = {
diff --git a/arch/arm/common/sa1111.c b/arch/arm/common/sa1111.c
index f89c1ea327a2..ff5e0d04cb89 100644
--- a/arch/arm/common/sa1111.c
+++ b/arch/arm/common/sa1111.c
@@ -1368,11 +1368,11 @@ static int sa1111_bus_remove(struct device *dev)
 {
 	struct sa1111_dev *sadev = to_sa1111_device(dev);
 	struct sa1111_driver *drv = SA1111_DRV(dev->driver);
-	int ret = 0;
 
 	if (drv->remove)
-		ret = drv->remove(sadev);
-	return ret;
+		drv->remove(sadev);
+
+	return 0;
 }
 
 struct bus_type sa1111_bus_type = {
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 6ed30421f697..e2b1fd558bf3 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -578,4 +578,21 @@ THUMB(	orr	\reg , \reg , #PSR_T_BIT	)
 	__adldst_l	str, \src, \sym, \tmp, \cond
 	.endm
 
+	/*
+	 * rev_l - byte-swap a 32-bit value
+	 *
+	 * @val: source/destination register
+	 * @tmp: scratch register
+	 */
+	.macro		rev_l, val:req, tmp:req
+	.if		__LINUX_ARM_ARCH__ < 6
+	eor		\tmp, \val, \val, ror #16
+	bic		\tmp, \tmp, #0x00ff0000
+	mov		\val, \val, ror #8
+	eor		\val, \val, \tmp, lsr #8
+	.else
+	rev		\val, \val
+	.endif
+	.endm
+
 #endif /* __ASM_ASSEMBLER_H__ */
diff --git a/arch/arm/include/asm/hardware/locomo.h b/arch/arm/include/asm/hardware/locomo.h
index f8712e3c29cf..246a3de25931 100644
--- a/arch/arm/include/asm/hardware/locomo.h
+++ b/arch/arm/include/asm/hardware/locomo.h
@@ -188,7 +188,7 @@ struct locomo_driver {
 	struct device_driver	drv;
 	unsigned int		devid;
 	int (*probe)(struct locomo_dev *);
-	int (*remove)(struct locomo_dev *);
+	void (*remove)(struct locomo_dev *);
 };
 
 #define LOCOMO_DRV(_d)	container_of((_d), struct locomo_driver, drv)
diff --git a/arch/arm/include/asm/hardware/sa1111.h b/arch/arm/include/asm/hardware/sa1111.h
index d134b9a5ff94..2e70db6f22ea 100644
--- a/arch/arm/include/asm/hardware/sa1111.h
+++ b/arch/arm/include/asm/hardware/sa1111.h
@@ -403,7 +403,7 @@ struct sa1111_driver {
 	struct device_driver	drv;
 	unsigned int		devid;
 	int (*probe)(struct sa1111_dev *);
-	int (*remove)(struct sa1111_dev *);
+	void (*remove)(struct sa1111_dev *);
 };
 
 #define SA1111_DRV(_d)	container_of((_d), struct sa1111_driver, drv)
diff --git a/arch/arm/include/debug/sti.S b/arch/arm/include/debug/sti.S
index 72d052511890..dc796ac2ac57 100644
--- a/arch/arm/include/debug/sti.S
+++ b/arch/arm/include/debug/sti.S
@@ -6,28 +6,6 @@
  * Copyright (C) 2013 STMicroelectronics (R&D) Limited.
  */
 
-#define STIH41X_COMMS_BASE              0xfed00000
-#define STIH41X_ASC2_BASE               (STIH41X_COMMS_BASE+0x32000)
-
-#define STIH41X_SBC_LPM_BASE            0xfe400000
-#define STIH41X_SBC_COMMS_BASE          (STIH41X_SBC_LPM_BASE + 0x100000)
-#define STIH41X_SBC_ASC1_BASE           (STIH41X_SBC_COMMS_BASE + 0x31000)
-
-
-#define VIRT_ADDRESS(x)		(x - 0x1000000)
-
-#if IS_ENABLED(CONFIG_STIH41X_DEBUG_ASC2)
-#define DEBUG_LL_UART_BASE	STIH41X_ASC2_BASE
-#endif
-
-#if IS_ENABLED(CONFIG_STIH41X_DEBUG_SBC_ASC1)
-#define DEBUG_LL_UART_BASE	STIH41X_SBC_ASC1_BASE
-#endif
-
-#ifndef DEBUG_LL_UART_BASE
-#error "DEBUG UART is not Configured"
-#endif
-
 #define ASC_TX_BUF_OFF  0x04
 #define ASC_CTRL_OFF    0x0c
 #define ASC_STA_OFF     0x14
@@ -37,8 +15,8 @@
 
 
 		.macro	addruart, rp, rv, tmp
-		ldr	\rp,      =DEBUG_LL_UART_BASE	@ physical base
-		ldr	\rv,      =VIRT_ADDRESS(DEBUG_LL_UART_BASE) @ virt base
+		ldr	\rp,      =CONFIG_DEBUG_UART_PHYS	@ physical base
+		ldr	\rv,      =CONFIG_DEBUG_UART_VIRT	@ virt base
 		.endm
 
                 .macro  senduart,rd,rx
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 5c48eb4fd0e5..74679240a9d8 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -540,12 +540,9 @@ void show_ipi_list(struct seq_file *p, int prec)
 	unsigned int cpu, i;
 
 	for (i = 0; i < NR_IPI; i++) {
-		unsigned int irq;
-
 		if (!ipi_desc[i])
 			continue;
 
-		irq = irq_desc_get_irq(ipi_desc[i]);
 		seq_printf(p, "%*s%u: ", prec - 1, "IPI", i);
 
 		for_each_online_cpu(cpu)
diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c
index 0203e545bbc8..075a2e0ed2c1 100644
--- a/arch/arm/kernel/sys_oabi-compat.c
+++ b/arch/arm/kernel/sys_oabi-compat.c
@@ -248,6 +248,7 @@ struct oabi_epoll_event {
 	__u64 data;
 } __attribute__ ((packed,aligned(4)));
 
+#ifdef CONFIG_EPOLL
 asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
 				   struct oabi_epoll_event __user *event)
 {
@@ -298,6 +299,20 @@ asmlinkage long sys_oabi_epoll_wait(int epfd,
 	kfree(kbuf);
 	return err ? -EFAULT : ret;
 }
+#else
+asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
+				   struct oabi_epoll_event __user *event)
+{
+	return -EINVAL;
+}
+
+asmlinkage long sys_oabi_epoll_wait(int epfd,
+				    struct oabi_epoll_event __user *events,
+				    int maxevents, int timeout)
+{
+	return -EINVAL;
+}
+#endif
 
 struct oabi_sembuf {
 	unsigned short	sem_num;
diff --git a/arch/arm/mach-sa1100/collie.c b/arch/arm/mach-sa1100/collie.c
index d4e89a02c8c8..14c33ed05318 100644
--- a/arch/arm/mach-sa1100/collie.c
+++ b/arch/arm/mach-sa1100/collie.c
@@ -224,18 +224,12 @@ static int collie_uart_probe(struct locomo_dev *dev)
 	return 0;
 }
 
-static int collie_uart_remove(struct locomo_dev *dev)
-{
-	return 0;
-}
-
 static struct locomo_driver collie_uart_driver = {
 	.drv = {
 		.name = "collie_uart",
 	},
 	.devid	= LOCOMO_DEVID_UART,
 	.probe	= collie_uart_probe,
-	.remove	= collie_uart_remove,
 };
 
 static int __init collie_uart_init(void)
diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
index c18d23a5e5f1..93ff0097f00b 100644
--- a/arch/arm/mm/dump.c
+++ b/arch/arm/mm/dump.c
@@ -19,6 +19,10 @@
 #include <asm/ptdump.h>
 
 static struct addr_marker address_markers[] = {
+#ifdef CONFIG_KASAN
+	{ KASAN_SHADOW_START,	"Kasan shadow start"},
+	{ KASAN_SHADOW_END,	"Kasan shadow end"},
+#endif
 	{ MODULES_VADDR,	"Modules" },
 	{ PAGE_OFFSET,		"Kernel Mapping" },
 	{ 0,			"vmalloc() Area" },
@@ -429,8 +433,11 @@ static void ptdump_initialize(void)
 				if (pg_level[i].bits[j].nx_bit)
 					pg_level[i].nx_bit = &pg_level[i].bits[j];
 			}
-
+#ifdef CONFIG_KASAN
+	address_markers[4].start_address = VMALLOC_START;
+#else
 	address_markers[2].start_address = VMALLOC_START;
+#endif
 }
 
 static struct ptdump_info kernel_ptdump_info = {
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index c06ebfbc48c4..a25b660c3017 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -18,7 +18,6 @@
 #include <asm/cp15.h>
 #include <asm/cputype.h>
 #include <asm/cachetype.h>
-#include <asm/fixmap.h>
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/smp_plat.h>
diff --git a/arch/arm/vdso/Makefile b/arch/arm/vdso/Makefile
index b558bee0e1f6..7c9e395b77f7 100644
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -23,7 +23,6 @@ ldflags-y := -Bsymbolic --no-undefined -soname=linux-vdso.so.1 \
 	    -T
 
 obj-$(CONFIG_VDSO) += vdso.o
-extra-$(CONFIG_VDSO) += vdso.lds
 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
 
 CFLAGS_REMOVE_vdso.o = -pg
diff --git a/drivers/input/keyboard/locomokbd.c b/drivers/input/keyboard/locomokbd.c
index daf6a753ca61..dae053596572 100644
--- a/drivers/input/keyboard/locomokbd.c
+++ b/drivers/input/keyboard/locomokbd.c
@@ -304,7 +304,7 @@ static int locomokbd_probe(struct locomo_dev *dev)
 	return err;
 }
 
-static int locomokbd_remove(struct locomo_dev *dev)
+static void locomokbd_remove(struct locomo_dev *dev)
 {
 	struct locomokbd *locomokbd = locomo_get_drvdata(dev);
 
@@ -318,8 +318,6 @@ static int locomokbd_remove(struct locomo_dev *dev)
 	release_mem_region((unsigned long) dev->mapbase, dev->length);
 
 	kfree(locomokbd);
-
-	return 0;
 }
 
 static struct locomo_driver keyboard_driver = {
diff --git a/drivers/input/serio/sa1111ps2.c b/drivers/input/serio/sa1111ps2.c
index 7b8ceb702a74..68fac4801e2e 100644
--- a/drivers/input/serio/sa1111ps2.c
+++ b/drivers/input/serio/sa1111ps2.c
@@ -344,7 +344,7 @@ static int ps2_probe(struct sa1111_dev *dev)
 /*
  * Remove one device from this driver.
  */
-static int ps2_remove(struct sa1111_dev *dev)
+static void ps2_remove(struct sa1111_dev *dev)
 {
 	struct ps2if *ps2if = sa1111_get_drvdata(dev);
 
@@ -353,8 +353,6 @@ static int ps2_remove(struct sa1111_dev *dev)
 	sa1111_set_drvdata(dev, NULL);
 
 	kfree(ps2if);
-
-	return 0;
 }
 
 /*
diff --git a/drivers/pcmcia/sa1111_generic.c b/drivers/pcmcia/sa1111_generic.c
index 11783410223b..29fdd174bc23 100644
--- a/drivers/pcmcia/sa1111_generic.c
+++ b/drivers/pcmcia/sa1111_generic.c
@@ -238,7 +238,7 @@ static int pcmcia_probe(struct sa1111_dev *dev)
 	return ret;
 }
 
-static int pcmcia_remove(struct sa1111_dev *dev)
+static void pcmcia_remove(struct sa1111_dev *dev)
 {
 	struct sa1111_pcmcia_socket *next, *s = dev_get_drvdata(&dev->dev);
 
@@ -252,7 +252,6 @@ static int pcmcia_remove(struct sa1111_dev *dev)
 
 	release_mem_region(dev->res.start, 512);
 	sa1111_disable_device(dev);
-	return 0;
 }
 
 static struct sa1111_driver pcmcia_driver = {
diff --git a/drivers/usb/host/ohci-sa1111.c b/drivers/usb/host/ohci-sa1111.c
index 8e19a5eb5b62..feca826d3f6a 100644
--- a/drivers/usb/host/ohci-sa1111.c
+++ b/drivers/usb/host/ohci-sa1111.c
@@ -236,7 +236,7 @@ static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev)
  * Reverses the effect of ohci_hcd_sa1111_probe(), first invoking
  * the HCD's stop() method.
  */
-static int ohci_hcd_sa1111_remove(struct sa1111_dev *dev)
+static void ohci_hcd_sa1111_remove(struct sa1111_dev *dev)
 {
 	struct usb_hcd *hcd = sa1111_get_drvdata(dev);
 
@@ -244,8 +244,6 @@ static int ohci_hcd_sa1111_remove(struct sa1111_dev *dev)
 	sa1111_stop_hc(dev);
 	release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 	usb_put_hcd(hcd);
-
-	return 0;
 }
 
 static void ohci_hcd_sa1111_shutdown(struct device *_dev)
diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c
index 297ee2e1ab0b..0468ea82159f 100644
--- a/drivers/video/backlight/locomolcd.c
+++ b/drivers/video/backlight/locomolcd.c
@@ -208,7 +208,7 @@ static int locomolcd_probe(struct locomo_dev *ldev)
 	return 0;
 }
 
-static int locomolcd_remove(struct locomo_dev *dev)
+static void locomolcd_remove(struct locomo_dev *dev)
 {
 	unsigned long flags;
 
@@ -220,7 +220,6 @@ static int locomolcd_remove(struct locomo_dev *dev)
 	local_irq_save(flags);
 	locomolcd_dev = NULL;
 	local_irq_restore(flags);
-	return 0;
 }
 
 static struct locomo_driver poodle_lcd_driver = {