Merge branch 'akpm' (patches from Andrew Morton) into next

Merge more updates from Andrew Morton:

 - Most of the rest of MM.

   This includes "mark remap_file_pages syscall as deprecated" but the
   actual "replace remap_file_pages syscall with emulation" is held
   back.  I guess we'll need to work out when to pull the trigger on
   that one.

 - various minor cleanups to obscure filesystems

 - the drivers/rtc queue

 - hfsplus updates

 - ufs, hpfs, fatfs, affs, reiserfs

 - Documentation/

 - signals

 - procfs

 - cpu hotplug

 - lib/idr.c

 - rapidio

 - sysctl

 - ipc updates

* emailed patches from Andrew Morton <[email protected]>: (171 commits)
  ufs: sb mutex merge + mutex_destroy
  powerpc: update comments for generic idle conversion
  cris: update comments for generic idle conversion
  idle: remove cpu_idle() forward declarations
  nbd: zero from and len fields in NBD_CMD_DISCONNECT.
  mm: convert some level-less printks to pr_*
  MAINTAINERS: adi-buildroot-devel is moderated
  MAINTAINERS: add linux-api for review of API/ABI changes
  mm/kmemleak-test.c: use pr_fmt for logging
  fs/dlm/debug_fs.c: replace seq_printf by seq_puts
  fs/dlm/lockspace.c: convert simple_str to kstr
  fs/dlm/config.c: convert simple_str to kstr
  mm: mark remap_file_pages() syscall as deprecated
  mm: memcontrol: remove unnecessary memcg argument from soft limit functions
  mm: memcontrol: clean up memcg zoneinfo lookup
  mm/memblock.c: call kmemleak directly from memblock_(alloc|free)
  mm/mempool.c: update the kmemleak stack trace for mempool allocations
  lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations
  mm: introduce kmemleak_update_trace()
  mm/kmemleak.c: use %u to print ->checksum
  ...

Documentation/SubmittingPatches

@@ -132,6 +132,20 @@ Example:
 	platform_set_drvdata(), but left the variable "dev" unused,
 	delete it.
 
+If your patch fixes a bug in a specific commit, e.g. you found an issue using
+git-bisect, please use the 'Fixes:' tag with the first 12 characters of the
+SHA-1 ID, and the one line summary.
+Example:
+
+	Fixes: e21d2170f366 ("video: remove unnecessary platform_set_drvdata()")
+
+The following git-config settings can be used to add a pretty format for
+outputting the above style in the git log or git show commands
+
+	[core]
+		abbrev = 12
+	[pretty]
+		fixes = Fixes: %h (\"%s\")
 
 3) Separate your changes.
 
@@ -443,7 +457,7 @@ person it names.  This tag documents that potentially interested parties
 have been included in the discussion
 
 
-14) Using Reported-by:, Tested-by:, Reviewed-by: and Suggested-by:
+14) Using Reported-by:, Tested-by:, Reviewed-by:, Suggested-by: and Fixes:
 
 If this patch fixes a problem reported by somebody else, consider adding a
 Reported-by: tag to credit the reporter for their contribution.  Please
@@ -498,6 +512,12 @@ idea was not posted in a public forum. That said, if we diligently credit our
 idea reporters, they will, hopefully, be inspired to help us again in the
 future.
 
+A Fixes: tag indicates that the patch fixes an issue in a previous commit. It
+is used to make it easy to determine where a bug originated, which can help
+review a bug fix. This tag also assists the stable kernel team in determining
+which stable kernel versions should receive your fix. This is the preferred
+method for indicating a bug fixed by the patch. See #2 above for more details.
+
 
 15) The canonical patch format
 

Documentation/cgroups/memory.txt

@@ -540,14 +540,13 @@ Note:
 
 5.3 swappiness
 
-Similar to /proc/sys/vm/swappiness, but only affecting reclaim that is
-triggered by this cgroup's hard limit.  The tunable in the root cgroup
-corresponds to the global swappiness setting.
-
-Please note that unlike the global swappiness, memcg knob set to 0
-really prevents from any swapping even if there is a swap storage
-available. This might lead to memcg OOM killer if there are no file
-pages to reclaim.
+Overrides /proc/sys/vm/swappiness for the particular group. The tunable
+in the root cgroup corresponds to the global swappiness setting.
+
+Please note that unlike during the global reclaim, limit reclaim
+enforces that 0 swappiness really prevents from any swapping even if
+there is a swap storage available. This might lead to memcg OOM killer
+if there are no file pages to reclaim.
 
 5.4 failcnt
 

Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt

@@ -9,6 +9,9 @@ Required properties:
 - interrupts: rtc alarm/event interrupt
 - #clock-cells: the value should be 0
 
+Optional properties:
+- clock-output-names: From common clock binding
+
 Example:
 
 hym8563: hym8563@51 {

Documentation/devicetree/bindings/rtc/xgene-rtc.txt

@@ -0,0 +1,28 @@
+* APM X-Gene Real Time Clock
+
+RTC controller for the APM X-Gene Real Time Clock
+
+Required properties:
+- compatible : Should be "apm,xgene-rtc"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- interrupts: IRQ line for the RTC.
+- #clock-cells: Should be 1.
+- clocks: Reference to the clock entry.
+
+Example:
+
+rtcclk: rtcclk {
+	compatible = "fixed-clock";
+	#clock-cells = <1>;
+	clock-frequency = <100000000>;
+	clock-output-names = "rtcclk";
+};
+
+rtc: rtc@10510000 {
+	compatible = "apm,xgene-rtc";
+	reg = <0x0 0x10510000 0x0 0x400>;
+	interrupts = <0x0 0x46 0x4>;
+	#clock-cells = <1>;
+	clocks = <&rtcclk 0>;
+};

Documentation/filesystems/seq_file.txt

@@ -54,6 +54,15 @@ how the mechanism works without getting lost in other details.  (Those
 wanting to see the full source for this module can find it at
 http://lwn.net/Articles/22359/).
 
+Deprecated create_proc_entry
+
+Note that the above article uses create_proc_entry which was removed in
+kernel 3.10. Current versions require the following update
+
+-	entry = create_proc_entry("sequence", 0, NULL);
+-	if (entry)
+-		entry->proc_fops = &ct_file_ops;
++	entry = proc_create("sequence", 0, NULL, &ct_file_ops);
 
 The iterator interface
 

Documentation/filesystems/vfat.txt

@@ -172,6 +172,11 @@ nfs=stale_rw|nostale_ro
 		To maintain backward compatibility, '-o nfs' is also accepted,
 		defaulting to stale_rw
 
+dos1xfloppy  -- If set, use a fallback default BIOS Parameter Block
+		configuration, determined by backing device size. These static
+		parameters match defaults assumed by DOS 1.x for 160 kiB,
+		180 kiB, 320 kiB, and 360 kiB floppies and floppy images.
+
 
 <bool>: 0,1,yes,no,true,false
 

Documentation/kernel-parameters.txt

@@ -2361,6 +2361,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			timeout < 0: reboot immediately
 			Format: <timeout>
 
+	crash_kexec_post_notifiers
+			Run kdump after running panic-notifiers and dumping
+			kmsg. This only for the users who doubt kdump always
+			succeeds in any situation.
+			Note that this also increases risks of kdump failure,
+			because some panic notifiers can make the crashed
+			kernel more unstable.
+
 	parkbd.port=	[HW] Parallel port number the keyboard adapter is
 			connected to, default is 0.
 			Format: <parport#>

Documentation/kmemleak.txt

@@ -142,6 +142,7 @@ kmemleak_alloc_percpu	 - notify of a percpu memory block allocation
 kmemleak_free		 - notify of a memory block freeing
 kmemleak_free_part	 - notify of a partial memory block freeing
 kmemleak_free_percpu	 - notify of a percpu memory block freeing
+kmemleak_update_trace	 - update object allocation stack trace
 kmemleak_not_leak	 - mark an object as not a leak
 kmemleak_ignore		 - do not scan or report an object as leak
 kmemleak_scan_area	 - add scan areas inside a memory block

Documentation/memory-barriers.txt

@@ -115,8 +115,8 @@ For example, consider the following sequence of events:
 	CPU 1		CPU 2
 	===============	===============
 	{ A == 1; B == 2 }
-	A = 3;		x = A;
-	B = 4;		y = B;
+	A = 3;		x = B;
+	B = 4;		y = A;
 
 The set of accesses as seen by the memory system in the middle can be arranged
 in 24 different combinations:

Documentation/sysctl/kernel.txt

@@ -77,6 +77,7 @@ show up in /proc/sys/kernel:
 - shmmni
 - stop-a                      [ SPARC only ]
 - sysrq                       ==> Documentation/sysrq.txt
+- sysctl_writes_strict
 - tainted
 - threads-max
 - unknown_nmi_panic
@@ -762,6 +763,26 @@ without users and with a dead originative process will be destroyed.
 
 ==============================================================
 
+sysctl_writes_strict:
+
+Control how file position affects the behavior of updating sysctl values
+via the /proc/sys interface:
+
+  -1 - Legacy per-write sysctl value handling, with no printk warnings.
+       Each write syscall must fully contain the sysctl value to be
+       written, and multiple writes on the same sysctl file descriptor
+       will rewrite the sysctl value, regardless of file position.
+   0 - (default) Same behavior as above, but warn about processes that
+       perform writes to a sysctl file descriptor when the file position
+       is not 0.
+   1 - Respect file position when writing sysctl strings. Multiple writes
+       will append to the sysctl value buffer. Anything past the max length
+       of the sysctl value buffer will be ignored. Writes to numeric sysctl
+       entries must always be at file position 0 and the value must be
+       fully contained in the buffer sent in the write syscall.
+
+==============================================================
+
 tainted:
 
 Non-zero if the kernel has been tainted.  Numeric values, which

Documentation/vm/remap_file_pages.txt

@@ -0,0 +1,28 @@
+The remap_file_pages() system call is used to create a nonlinear mapping,
+that is, a mapping in which the pages of the file are mapped into a
+nonsequential order in memory. The advantage of using remap_file_pages()
+over using repeated calls to mmap(2) is that the former approach does not
+require the kernel to create additional VMA (Virtual Memory Area) data
+structures.
+
+Supporting of nonlinear mapping requires significant amount of non-trivial
+code in kernel virtual memory subsystem including hot paths. Also to get
+nonlinear mapping work kernel need a way to distinguish normal page table
+entries from entries with file offset (pte_file). Kernel reserves flag in
+PTE for this purpose. PTE flags are scarce resource especially on some CPU
+architectures. It would be nice to free up the flag for other usage.
+
+Fortunately, there are not many users of remap_file_pages() in the wild.
+It's only known that one enterprise RDBMS implementation uses the syscall
+on 32-bit systems to map files bigger than can linearly fit into 32-bit
+virtual address space. This use-case is not critical anymore since 64-bit
+systems are widely available.
+
+The plan is to deprecate the syscall and replace it with an emulation.
+The emulation will create new VMAs instead of nonlinear mappings. It's
+going to work slower for rare users of remap_file_pages() but ABI is
+preserved.
+
+One side effect of emulation (apart from performance) is that user can hit
+vm.max_map_count limit more easily due to additional VMAs. See comment for
+DEFAULT_MAX_MAP_COUNT for more details on the limit.

MAINTAINERS

@@ -210,6 +210,13 @@ S:	Supported
 F:	Documentation/scsi/aacraid.txt
 F:	drivers/scsi/aacraid/
 
+ABI/API
+L:	[email protected]
+F:	Documentation/ABI/
+F:	include/linux/syscalls.h
+F:	include/uapi/
+F:	kernel/sys_ni.c
+
 ABIT UGURU 1,2 HARDWARE MONITOR DRIVER
 M:	Hans de Goede <[email protected]>
 L:	[email protected]
@@ -647,7 +654,7 @@ F:	sound/soc/codecs/ssm*
 F:	sound/soc/codecs/sigmadsp.*
 
 ANALOG DEVICES INC ASOC DRIVERS
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org/
 S:	Supported
@@ -1758,54 +1765,54 @@ F:	include/uapi/linux/bfs_fs.h
 
 BLACKFIN ARCHITECTURE
 M:	Steven Miao <[email protected]>
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 T:	git git://git.code.sf.net/p/adi-linux/code
 W:	http://blackfin.uclinux.org
 S:	Supported
 F:	arch/blackfin/
 
 BLACKFIN EMAC DRIVER
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org
 S:	Supported
 F:	drivers/net/ethernet/adi/
 
 BLACKFIN RTC DRIVER
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org
 S:	Supported
 F:	drivers/rtc/rtc-bfin.c
 
 BLACKFIN SDH DRIVER
 M:	Sonic Zhang <[email protected]>
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org
 S:	Supported
 F:	drivers/mmc/host/bfin_sdh.c
 
 BLACKFIN SERIAL DRIVER
 M:	Sonic Zhang <[email protected]>
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org
 S:	Supported
 F:	drivers/tty/serial/bfin_uart.c
 
 BLACKFIN WATCHDOG DRIVER
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org
 S:	Supported
 F:	drivers/watchdog/bfin_wdt.c
 
 BLACKFIN I2C TWI DRIVER
 M:	Sonic Zhang <[email protected]>
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org/
 S:	Supported
 F:	drivers/i2c/busses/i2c-bfin-twi.c
 
 BLACKFIN MEDIA DRIVER
 M:	Scott Jiang <[email protected]>
-L:	[email protected]
+L:	[email protected] (moderated for non-subscribers)
 W:	http://blackfin.uclinux.org/
 S:	Supported
 F:	drivers/media/platform/blackfin/

arch/arm/kernel/isa.c

@@ -20,7 +20,7 @@
 
 static unsigned int isa_membase, isa_portbase, isa_portshift;
 
-static ctl_table ctl_isa_vars[4] = {
+static struct ctl_table ctl_isa_vars[4] = {
 	{
 		.procname	= "membase",
 		.data		= &isa_membase, 
@@ -44,15 +44,15 @@ static ctl_table ctl_isa_vars[4] = {
 
 static struct ctl_table_header *isa_sysctl_header;
 
-static ctl_table ctl_isa[2] = {
+static struct ctl_table ctl_isa[2] = {
 	{
 		.procname	= "isa",
 		.mode		= 0555,
 		.child		= ctl_isa_vars,
 	}, {}
 };
 
-static ctl_table ctl_bus[2] = {
+static struct ctl_table ctl_bus[2] = {
 	{
 		.procname	= "bus",
 		.mode		= 0555,

arch/arm/mach-at91/sysirq_mask.c

@@ -25,24 +25,28 @@
 
 #include "generic.h"
 
-#define AT91_RTC_IDR	0x24	/* Interrupt Disable Register */
-#define AT91_RTC_IMR	0x28	/* Interrupt Mask Register */
+#define AT91_RTC_IDR		0x24	/* Interrupt Disable Register */
+#define AT91_RTC_IMR		0x28	/* Interrupt Mask Register */
+#define AT91_RTC_IRQ_MASK	0x1f	/* Available IRQs mask */
 
 void __init at91_sysirq_mask_rtc(u32 rtc_base)
 {
 	void __iomem *base;
-	u32 mask;
 
 	base = ioremap(rtc_base, 64);
 	if (!base)
 		return;
 
-	mask = readl_relaxed(base + AT91_RTC_IMR);
-	if (mask) {
-		pr_info("AT91: Disabling rtc irq\n");
-		writel_relaxed(mask, base + AT91_RTC_IDR);
-		(void)readl_relaxed(base + AT91_RTC_IMR);	/* flush */
-	}
+	/*
+	 * sam9x5 SoCs have the following errata:
+	 * "RTC: Interrupt Mask Register cannot be used
+	 *  Interrupt Mask Register read always returns 0."
+	 *
+	 * Hence we're not relying on IMR values to disable
+	 * interrupts.
+	 */
+	writel_relaxed(AT91_RTC_IRQ_MASK, base + AT91_RTC_IDR);
+	(void)readl_relaxed(base + AT91_RTC_IMR);	/* flush */
 
 	iounmap(base);
 }