Merge branch 'akpm' (patches from Andrew)

Merge misc updates from Andrew Morton:

 - kasan updates

 - procfs

 - lib/bitmap updates

 - other lib/ updates

 - checkpatch tweaks

 - rapidio

 - ubsan

 - pipe fixes and cleanups

 - lots of other misc bits

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (114 commits)
  Documentation/sysctl/user.txt: fix typo
  MAINTAINERS: update ARM/QUALCOMM SUPPORT patterns
  MAINTAINERS: update various PALM patterns
  MAINTAINERS: update "ARM/OXNAS platform support" patterns
  MAINTAINERS: update Cortina/Gemini patterns
  MAINTAINERS: remove ARM/CLKDEV SUPPORT file pattern
  MAINTAINERS: remove ANDROID ION pattern
  mm: docs: add blank lines to silence sphinx "Unexpected indentation" errors
  mm: docs: fix parameter names mismatch
  mm: docs: fixup punctuation
  pipe: read buffer limits atomically
  pipe: simplify round_pipe_size()
  pipe: reject F_SETPIPE_SZ with size over UINT_MAX
  pipe: fix off-by-one error when checking buffer limits
  pipe: actually allow root to exceed the pipe buffer limits
  pipe, sysctl: remove pipe_proc_fn()
  pipe, sysctl: drop 'min' parameter from pipe-max-size converter
  kasan: rework Kconfig settings
  crash_dump: is_kdump_kernel can be boolean
  kernel/mutex: mutex_is_locked can be boolean
  ...

Author: torvalds

Documentation/sysctl/user.txt

@@ -3,7 +3,7 @@ Documentation for /proc/sys/user/*	kernel version 4.9.0
 
 ==============================================================
 
-This file contains the documetation for the sysctl files in
+This file contains the documentation for the sysctl files in
 /proc/sys/user.
 
 The files in this directory can be used to override the default

MAINTAINERS

@@ -903,7 +903,6 @@ L:	devel@driverdev.osuosl.org
 S:	Supported
 F:	drivers/staging/android/ion
 F:	drivers/staging/android/uapi/ion.h
-F:	drivers/staging/android/uapi/ion_test.h
 
 AOA (Apple Onboard Audio) ALSA DRIVER
 M:	Johannes Berg <johannes@sipsolutions.net>
@@ -1308,7 +1307,6 @@ M:	Russell King <linux@armlinux.org.uk>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 T:	git git://git.armlinux.org.uk/~rmk/linux-arm.git clkdev
-F:	arch/arm/include/asm/clkdev.h
 F:	drivers/clk/clkdev.c
 
 ARM/COMPULAB CM-X270/EM-X270 and CM-X300 MACHINE SUPPORT
@@ -1360,7 +1358,7 @@ F:	Documentation/devicetree/bindings/pinctrl/cortina,gemini-pinctrl.txt
 F:	Documentation/devicetree/bindings/net/cortina,gemini-ethernet.txt
 F:	Documentation/devicetree/bindings/rtc/faraday,ftrtc010.txt
 F:	arch/arm/mach-gemini/
-F:	drivers/net/ethernet/cortina/gemini/*
+F:	drivers/net/ethernet/cortina/
 F:	drivers/pinctrl/pinctrl-gemini.c
 F:	drivers/rtc/rtc-ftrtc010.c
 
@@ -1737,18 +1735,15 @@ L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-oxnas@lists.tuxfamily.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm/mach-oxnas/
-F:	arch/arm/boot/dts/ox8*.dtsi
-F:	arch/arm/boot/dts/wd-mbwe.dts
-F:	arch/arm/boot/dts/cloudengines-pogoplug-series-3.dts
+F:	arch/arm/boot/dts/ox8*.dts*
 N:	oxnas
 
 ARM/PALM TREO SUPPORT
 M:	Tomas Cech <sleep_walker@suse.com>
 L:	linux-arm-kernel@lists.infradead.org
 W:	http://hackndev.com
 S:	Maintained
-F:	arch/arm/mach-pxa/include/mach/palmtreo.h
-F:	arch/arm/mach-pxa/palmtreo.c
+F:	arch/arm/mach-pxa/palmtreo.*
 
 ARM/PALMTX,PALMT5,PALMLD,PALMTE2,PALMTC SUPPORT
 M:	Marek Vasut <marek.vasut@gmail.com>
@@ -1757,12 +1752,10 @@ W:	http://hackndev.com
 S:	Maintained
 F:	arch/arm/mach-pxa/include/mach/palmtx.h
 F:	arch/arm/mach-pxa/palmtx.c
-F:	arch/arm/mach-pxa/include/mach/palmt5.h
-F:	arch/arm/mach-pxa/palmt5.c
+F:	arch/arm/mach-pxa/palmt5.*
 F:	arch/arm/mach-pxa/include/mach/palmld.h
 F:	arch/arm/mach-pxa/palmld.c
-F:	arch/arm/mach-pxa/include/mach/palmte2.h
-F:	arch/arm/mach-pxa/palmte2.c
+F:	arch/arm/mach-pxa/palmte2.*
 F:	arch/arm/mach-pxa/include/mach/palmtc.h
 F:	arch/arm/mach-pxa/palmtc.c
 
@@ -1771,8 +1764,7 @@ M:	Sergey Lapin <slapin@ossfans.org>
 L:	linux-arm-kernel@lists.infradead.org
 W:	http://hackndev.com
 S:	Maintained
-F:	arch/arm/mach-pxa/include/mach/palmz72.h
-F:	arch/arm/mach-pxa/palmz72.c
+F:	arch/arm/mach-pxa/palmz72.*
 
 ARM/PLEB SUPPORT
 M:	Peter Chubb <pleb@gelato.unsw.edu.au>
@@ -1801,7 +1793,6 @@ F:	drivers/clk/qcom/
 F:	drivers/dma/qcom/
 F:	drivers/soc/qcom/
 F:	drivers/spi/spi-qup.c
-F:	drivers/tty/serial/msm_serial.h
 F:	drivers/tty/serial/msm_serial.c
 F:	drivers/*/pm8???-*
 F:	drivers/mfd/ssbi.c
@@ -3567,7 +3558,7 @@ F:	drivers/media/platform/coda/
 
 COMMON CLK FRAMEWORK
 M:	Michael Turquette <mturquette@baylibre.com>
-M:	Stephen Boyd <sboyd@codeaurora.org>
+M:	Stephen Boyd <sboyd@kernel.org>
 L:	linux-clk@vger.kernel.org
 Q:	http://patchwork.kernel.org/project/linux-clk/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git
@@ -10284,7 +10275,7 @@ F:	include/uapi/linux/openvswitch.h
 OPERATING PERFORMANCE POINTS (OPP)
 M:	Viresh Kumar <vireshk@kernel.org>
 M:	Nishanth Menon <nm@ti.com>
-M:	Stephen Boyd <sboyd@codeaurora.org>
+M:	Stephen Boyd <sboyd@kernel.org>
 L:	linux-pm@vger.kernel.org
 S:	Maintained
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git
@@ -13020,7 +13011,7 @@ F:	Documentation/networking/spider_net.txt
 F:	drivers/net/ethernet/toshiba/spider_net*
 
 SPMI SUBSYSTEM
-R:	Stephen Boyd <sboyd@codeaurora.org>
+R:	Stephen Boyd <sboyd@kernel.org>
 L:	linux-arm-msm@vger.kernel.org
 F:	Documentation/devicetree/bindings/spmi/
 F:	drivers/spmi/
@@ -13905,7 +13896,7 @@ F:	include/linux/usb/tilegx.h
 TIMEKEEPING, CLOCKSOURCE CORE, NTP, ALARMTIMER
 M:	John Stultz <john.stultz@linaro.org>
 M:	Thomas Gleixner <tglx@linutronix.de>
-R:	Stephen Boyd <sboyd@codeaurora.org>
+R:	Stephen Boyd <sboyd@kernel.org>
 L:	linux-kernel@vger.kernel.org
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
 S:	Supported

Makefile

@@ -434,7 +434,8 @@ export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 
 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
-export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN
+export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
+export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
@@ -679,6 +680,10 @@ endif
 # This selects the stack protector compiler flag. Testing it is delayed
 # until after .config has been reprocessed, in the prepare-compiler-check
 # target.
+ifdef CONFIG_CC_STACKPROTECTOR_AUTO
+  stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
+  stackp-name := AUTO
+else
 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
   stackp-flag := -fstack-protector
   stackp-name := REGULAR
@@ -687,16 +692,40 @@ ifdef CONFIG_CC_STACKPROTECTOR_STRONG
   stackp-flag := -fstack-protector-strong
   stackp-name := STRONG
 else
+  # If either there is no stack protector for this architecture or
+  # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
+  # is empty, skipping all remaining stack protector tests.
+  #
   # Force off for distro compilers that enable stack protector by default.
-  stackp-flag := $(call cc-option, -fno-stack-protector)
+  KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
+endif
 endif
 endif
 # Find arch-specific stack protector compiler sanity-checking script.
-ifdef CONFIG_CC_STACKPROTECTOR
+ifdef stackp-name
+ifneq ($(stackp-flag),)
   stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
   stackp-check := $(wildcard $(stackp-path))
+  # If the wildcard test matches a test script, run it to check functionality.
+  ifdef stackp-check
+    ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
+      stackp-broken := y
+    endif
+  endif
+  ifndef stackp-broken
+    # If the stack protector is functional, enable code that depends on it.
+    KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
+    # Either we've already detected the flag (for AUTO) or we'll fail the
+    # build in the prepare-compiler-check rule (for specific flag).
+    KBUILD_CFLAGS += $(stackp-flag)
+  else
+    # We have to make sure stack protector is unconditionally disabled if
+    # the compiler is broken (in case we're going to continue the build in
+    # AUTO mode).
+    KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
+  endif
+endif
 endif
-KBUILD_CFLAGS += $(stackp-flag)
 
 ifeq ($(cc-name),clang)
 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
@@ -1091,14 +1120,25 @@ PHONY += prepare-compiler-check
 prepare-compiler-check: FORCE
 # Make sure compiler supports requested stack protector flag.
 ifdef stackp-name
+  # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
+  ifeq ($(stackp-flag),)
+	@echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
+		  Compiler does not support any known stack-protector >&2
+  else
+  # Fail if specifically requested stack protector is missing.
   ifeq ($(call cc-option, $(stackp-flag)),)
 	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
 		  $(stackp-flag) not supported by compiler >&2 && exit 1
   endif
+  endif
 endif
-# Make sure compiler does not have buggy stack-protector support.
-ifdef stackp-check
-  ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
+# Make sure compiler does not have buggy stack-protector support. If a
+# specific stack-protector was requested, fail the build, otherwise warn.
+ifdef stackp-broken
+  ifeq ($(stackp-name),AUTO)
+	@echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
+                  $(stackp-flag) available but compiler is broken: disabling >&2
+  else
 	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
                   $(stackp-flag) available but compiler is broken >&2 && exit 1
   endif

arch/Kconfig

@@ -538,16 +538,10 @@ config HAVE_CC_STACKPROTECTOR
 	  - its compiler supports the -fstack-protector option
 	  - it has implemented a stack canary (e.g. __stack_chk_guard)
 
-config CC_STACKPROTECTOR
-	def_bool n
-	help
-	  Set when a stack-protector mode is enabled, so that the build
-	  can enable kernel-side support for the GCC feature.
-
 choice
 	prompt "Stack Protector buffer overflow detection"
 	depends on HAVE_CC_STACKPROTECTOR
-	default CC_STACKPROTECTOR_NONE
+	default CC_STACKPROTECTOR_AUTO
 	help
 	  This option turns on the "stack-protector" GCC feature. This
 	  feature puts, at the beginning of functions, a canary value on
@@ -564,7 +558,6 @@ config CC_STACKPROTECTOR_NONE
 
 config CC_STACKPROTECTOR_REGULAR
 	bool "Regular"
-	select CC_STACKPROTECTOR
 	help
 	  Functions will have the stack-protector canary logic added if they
 	  have an 8-byte or larger character array on the stack.
@@ -578,7 +571,6 @@ config CC_STACKPROTECTOR_REGULAR
 
 config CC_STACKPROTECTOR_STRONG
 	bool "Strong"
-	select CC_STACKPROTECTOR
 	help
 	  Functions will have the stack-protector canary logic added in any
 	  of the following conditions:
@@ -596,6 +588,12 @@ config CC_STACKPROTECTOR_STRONG
 	  about 20% of all kernel functions, which increases the kernel code
 	  size by about 2%.
 
+config CC_STACKPROTECTOR_AUTO
+	bool "Automatic"
+	help
+	  If the compiler supports it, the best available stack-protector
+	  option will be chosen.
+
 endchoice
 
 config THIN_ARCHIVES

arch/arm/include/asm/bitops.h

@@ -338,6 +338,7 @@ static inline int find_next_bit_le(const void *p, int size, int offset)
 
 #endif
 
+#include <asm-generic/bitops/find.h>
 #include <asm-generic/bitops/le.h>
 
 /*

arch/arm64/include/asm/kasan.h

@@ -12,22 +12,25 @@
 
 /*
  * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
- * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/8 of kernel virtual addresses.
+ * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
+ * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
  */
 #define KASAN_SHADOW_START      (VA_START)
 #define KASAN_SHADOW_END        (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
 
 /*
  * This value is used to map an address to the corresponding shadow
  * address by the following formula:
- *     shadow_addr = (address >> 3) + KASAN_SHADOW_OFFSET;
+ *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
  *
- * (1 << 61) shadow addresses - [KASAN_SHADOW_OFFSET,KASAN_SHADOW_END]
- * cover all 64-bits of virtual addresses. So KASAN_SHADOW_OFFSET
- * should satisfy the following equation:
- *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - (1ULL << 61)
+ * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
+ * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
+ * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
+ *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
+ *				(1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
  */
-#define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << (64 - 3)))
+#define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << \
+					(64 - KASAN_SHADOW_SCALE_SHIFT)))
 
 void kasan_init(void);
 void kasan_copy_shadow(pgd_t *pgdir);

arch/arm64/include/asm/memory.h

@@ -85,7 +85,8 @@
  * stack size when KASAN is in use.
  */
 #ifdef CONFIG_KASAN
-#define KASAN_SHADOW_SIZE	(UL(1) << (VA_BITS - 3))
+#define KASAN_SHADOW_SCALE_SHIFT 3
+#define KASAN_SHADOW_SIZE	(UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
 #define KASAN_THREAD_SHIFT	1
 #else
 #define KASAN_SHADOW_SIZE	(0)

arch/arm64/kernel/perf_event.c

@@ -925,9 +925,8 @@ static void __armv8pmu_probe_pmu(void *info)
 	pmceid[0] = read_sysreg(pmceid0_el0);
 	pmceid[1] = read_sysreg(pmceid1_el0);
 
-	bitmap_from_u32array(cpu_pmu->pmceid_bitmap,
-			     ARMV8_PMUV3_MAX_COMMON_EVENTS, pmceid,
-			     ARRAY_SIZE(pmceid));
+	bitmap_from_arr32(cpu_pmu->pmceid_bitmap,
+			     pmceid, ARMV8_PMUV3_MAX_COMMON_EVENTS);
 }
 
 static int armv8pmu_probe_pmu(struct arm_pmu *cpu_pmu)

arch/arm64/mm/kasan_init.c

@@ -135,7 +135,8 @@ static void __init kasan_pgd_populate(unsigned long addr, unsigned long end,
 /* The early shadow maps everything to a single page of zeroes */
 asmlinkage void __init kasan_early_init(void)
 {
-	BUILD_BUG_ON(KASAN_SHADOW_OFFSET != KASAN_SHADOW_END - (1UL << 61));
+	BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
+		KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));
 	BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PGDIR_SIZE));
 	BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE));
 	kasan_pgd_populate(KASAN_SHADOW_START, KASAN_SHADOW_END, NUMA_NO_NODE,

arch/ia64/kernel/perfmon.c

@@ -2610,17 +2610,10 @@ pfm_get_task(pfm_context_t *ctx, pid_t pid, struct task_struct **task)
 	if (pid < 2) return -EPERM;
 
 	if (pid != task_pid_vnr(current)) {
-
-		read_lock(&tasklist_lock);
-
-		p = find_task_by_vpid(pid);
-
 		/* make sure task cannot go away while we operate on it */
-		if (p) get_task_struct(p);
-
-		read_unlock(&tasklist_lock);
-
-		if (p == NULL) return -ESRCH;
+		p = find_get_task_by_vpid(pid);
+		if (!p)
+			return -ESRCH;
 	}
 
 	ret = pfm_task_incompatible(ctx, p);

arch/m68k/include/asm/bitops.h

@@ -311,7 +311,6 @@ static inline int bfchg_mem_test_and_change_bit(int nr,
  *	functions.
  */
 #if defined(CONFIG_CPU_HAS_NO_BITFIELDS)
-#include <asm-generic/bitops/find.h>
 #include <asm-generic/bitops/ffz.h>
 #else
 
@@ -441,6 +440,8 @@ static inline unsigned long ffz(unsigned long word)
 
 #endif
 
+#include <asm-generic/bitops/find.h>
+
 #ifdef __KERNEL__
 
 #if defined(CONFIG_CPU_HAS_NO_BITFIELDS)

arch/score/kernel/setup.c

@@ -124,9 +124,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 {
 	unsigned long n = (unsigned long) v - 1;
 
-	seq_printf(m, "processor\t\t: %ld\n", n);
-	seq_printf(m, "\n");
-
+	seq_printf(m, "processor\t\t: %ld\n\n", n);
 	return 0;
 }
 

arch/unicore32/include/asm/bitops.h

@@ -44,4 +44,6 @@ static inline int fls(int x)
 #define find_first_bit		find_first_bit
 #define find_first_zero_bit	find_first_zero_bit
 
+#include <asm-generic/bitops/find.h>
+
 #endif /* __UNICORE_BITOPS_H__ */