It's a pathname.  It should use the pathname allocators and
deallocators, and PATH_MAX instead of PAGE_SIZE.  Never mind that the
two are commonly the same.

With this, the allocations scale up nicely too, and I can do getcwd()
system calls at a rate of about 300M/s, with no lock contention
anywhere.

Of course, nobody sane does that, especially since getcwd() is
traditionally a very slow operation in Unix.  But this was also the
simplest way to benchmark the prepend_path() improvements by Waiman, and
once I saw the profiles I couldn't leave it well enough alone.

But apart from being an performance improvement (from using per-cpu slab
allocators instead of the raw page allocator), it's actually a valid and
real cleanup.
Signed-off-by: Linus "OCD" Torvalds <torvalds@linux-foundation.org>

Oops.  That wasn't very smart.  We don't actually need the RCU lock any
more by the time we copy the cwd string to user space, but I had
stupidly surrounded the whole thing with it.

Introduced by commit 8b19e341 ("vfs: make getcwd() get the root and
pwd path under rcu")

Is-a-big-hairy-idiot: Linus Torvalds <torvalds@linux-foundation.org>

Pull led updates from Bryan Wu:
 "Sorry for the late pull request, since I'm just back from vacation.

  LED subsystem updates for 3.12:
   - pca9633 driver DT supporting and pca9634 chip supporting
   - restore legacy device attributes for lp5521
   - other fixing and updates"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds: (28 commits)
  leds: wm831x-status: Request a REG resource
  leds: trigger: ledtrig-backlight: Fix invalid memory access in fb_event notification callback
  leds-pca963x: Fix device tree parsing
  leds-pca9633: Rename to leds-pca963x
  leds-pca9633: Add mutex to the ledout register
  leds-pca9633: Unique naming of the LEDs
  leds-pca9633: Add support for PCA9634
  leds: lp5562: use LP55xx common macros for device attributes
  Documentation: leds-lp5521,lp5523: update device attribute information
  leds: lp5523: remove unnecessary writing commands
  leds: lp5523: restore legacy device attributes
  leds: lp5523: LED MUX configuration on initializing
  leds: lp5523: make separate API for loading engine
  leds: lp5521: remove unnecessary writing commands
  leds: lp5521: restore legacy device attributes
  leds: lp55xx: add common macros for device attributes
  leds: lp55xx: add common data structure for program
  Documentation: leds: Fix a typo
  leds: ss4200: Fix incorrect placement of __initdata
  leds: clevo-mail: Fix incorrect placement of __initdata
  ...

Pull IOMMU Updates from Joerg Roedel:
 "This round the updates contain:

   - A new driver for the Freescale PAMU IOMMU from Varun Sethi.

     This driver has cooked for a while and required changes to the
     IOMMU-API and infrastructure that were already merged before.

   - Updates for the ARM-SMMU driver from Will Deacon

   - Various fixes, the most important one is probably a fix from Alex
     Williamson for a memory leak in the VT-d page-table freeing code

  In summary not all that much.  The biggest part in the diffstat is the
  new PAMU driver"

* tag 'iommu-updates-v3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  intel-iommu: Fix leaks in pagetable freeing
  iommu/amd: Fix resource leak in iommu_init_device()
  iommu/amd: Clean up unnecessary MSI/MSI-X capability find
  iommu/arm-smmu: Simplify VMID and ASID allocation
  iommu/arm-smmu: Don't use VMIDs for stage-1 translations
  iommu/arm-smmu: Tighten up global fault reporting
  iommu/arm-smmu: Remove broken big-endian check
  iommu/fsl: Remove unnecessary 'fsl-pamu' prefixes
  iommu/fsl: Fix whitespace problems noticed by git-am
  iommu/fsl: Freescale PAMU driver and iommu implementation.
  iommu/fsl: Add additional iommu attributes required by the PAMU driver.
  powerpc: Add iommu domain pointer to device archdata
  iommu/exynos: Remove dead code (set_prefbuf)

Merge tag 'stable/for-linus-3.12-rc0-tag-three' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen balloon driver bug-fixes from Stefano Stabellini:
 - fix a preemption bug in xen/balloon.c;
 - remove an harmful BUG_ON in xen/balloon.c that can trigger in
   non-erroneous situations.

* tag 'stable/for-linus-3.12-rc0-tag-three' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/balloon: remove BUG_ON in increase_reservation
  xen/balloon: ensure preemption is disabled when using a scratch page

Pull ACPI and power management fixes from Rafael Wysocki:
 "All of these commits are fixes that have emerged recently and some of
  them fix bugs introduced during this merge window.

  Specifics:

   1) ACPI-based PCI hotplug (ACPIPHP) fixes related to spurious events

      After the recent ACPIPHP changes we've seen some interesting
      breakage on a system that triggers device check notifications
      during boot for non-existing devices.  Although those
      notifications are really spurious, we should be able to deal with
      them nevertheless and that shouldn't introduce too much overhead.
      Four commits to make that work properly.

   2) Memory hotplug and hibernation mutual exclusion rework

      This was maent to be a cleanup, but it happens to fix a classical
      ABBA deadlock between system suspend/hibernation and ACPI memory
      hotplug which is possible if they are started roughly at the same
      time.  Three commits rework memory hotplug so that it doesn't
      acquire pm_mutex and make hibernation use device_hotplug_lock
      which prevents it from racing with memory hotplug.

   3) ACPI Intel LPSS (Low-Power Subsystem) driver crash fix

      The ACPI LPSS driver crashes during boot on Apple Macbook Air with
      Haswell that has slightly unusual BIOS configuration in which one
      of the LPSS device's _CRS method doesn't return all of the
      information expected by the driver.  Fix from Mika Westerberg, for
      stable.

   4) ACPICA fix related to Store->ArgX operation

      AML interpreter fix for obscure breakage that causes AML to be
      executed incorrectly on some machines (observed in practice).
      From Bob Moore.

   5) ACPI core fix for PCI ACPI device objects lookup

      There still are cases in which there is more than one ACPI device
      object matching a given PCI device and we don't choose the one
      that the BIOS expects us to choose, so this makes the lookup take
      more criteria into account in those cases.

   6) Fix to prevent cpuidle from crashing in some rare cases

      If the result of cpuidle_get_driver() is NULL, which can happen on
      some systems, cpuidle_driver_ref() will crash trying to use that
      pointer and the Daniel Fu's fix prevents that from happening.

   7) cpufreq fixes related to CPU hotplug

      Stephen Boyd reported a number of concurrency problems with
      cpufreq related to CPU hotplug which are addressed by a series of
      fixes from Srivatsa S Bhat and Viresh Kumar.

   8) cpufreq fix for time conversion in time_in_state attribute

      Time conversion carried out by cpufreq when user space attempts to
      read /sys/devices/system/cpu/cpu*/cpufreq/stats/time_in_state
      won't work correcty if cputime_t doesn't map directly to jiffies.
      Fix from Andreas Schwab.

   9) Revert of a troublesome cpufreq commit

      Commit 7c30ed53 (cpufreq: make sure frequency transitions are
      serialized) was intended to address some known concurrency
      problems in cpufreq related to the ordering of transitions, but
      unfortunately it introduced several problems of its own, so I
      decided to revert it now and address the original problems later
      in a more robust way.

  10) Intel Haswell CPU models for intel_pstate from Nell Hardcastle.

  11) cpufreq fixes related to system suspend/resume

      The recent cpufreq changes that made it preserve CPU sysfs
      attributes over suspend/resume cycles introduced a possible NULL
      pointer dereference that caused it to crash during the second
      attempt to suspend.  Three commits from Srivatsa S Bhat fix that
      problem and a couple of related issues.

  12) cpufreq locking fix

      cpufreq_policy_restore() should acquire the lock for reading, but
      it acquires it for writing.  Fix from Lan Tianyu"

* tag 'pm+acpi-fixes-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (25 commits)
  cpufreq: Acquire the lock in cpufreq_policy_restore() for reading
  cpufreq: Prevent problems in update_policy_cpu() if last_cpu == new_cpu
  cpufreq: Restructure if/else block to avoid unintended behavior
  cpufreq: Fix crash in cpufreq-stats during suspend/resume
  intel_pstate: Add Haswell CPU models
  Revert "cpufreq: make sure frequency transitions are serialized"
  cpufreq: Use signed type for 'ret' variable, to store negative error values
  cpufreq: Remove temporary fix for race between CPU hotplug and sysfs-writes
  cpufreq: Synchronize the cpufreq store_*() routines with CPU hotplug
  cpufreq: Invoke __cpufreq_remove_dev_finish() after releasing cpu_hotplug.lock
  cpufreq: Split __cpufreq_remove_dev() into two parts
  cpufreq: Fix wrong time unit conversion
  cpufreq: serialize calls to __cpufreq_governor()
  cpufreq: don't allow governor limits to be changed when it is disabled
  ACPI / bind: Prefer device objects with _STA to those without it
  ACPI / hotplug / PCI: Avoid parent bus rescans on spurious device checks
  ACPI / hotplug / PCI: Use _OST to notify firmware about notify status
  ACPI / hotplug / PCI: Avoid doing too much for spurious notifies
  ACPICA: Fix for a Store->ArgX when ArgX contains a reference to a field.
  ACPI / hotplug / PCI: Don't trim devices before scanning the namespace
  ...

Pull perf fixes from Ingo Molnar:
 "Various fixes.

  The -g perf report lockup you reported is only partially addressed,
  patches that fix the excessive runtime are still being worked on"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86: Fix uncore PCI fixed counter handling
  uprobes: Fix utask->depth accounting in handle_trampoline()
  perf/x86: Add constraint for IVB CYCLE_ACTIVITY:CYCLES_LDM_PENDING
  perf: Fix up MMAP2 buffer space reservation
  perf tools: Add attr->mmap2 support
  perf kvm: Fix sample_type manipulation
  perf evlist: Fix id pos in perf_evlist__open()
  perf trace: Handle perf.data files with no tracepoints
  perf session: Separate progress bar update when processing events
  perf trace: Check if MAP_32BIT is defined
  perf hists: Fix formatting of long symbol names
  perf evlist: Fix parsing with no sample_id_all bit set
  perf tools: Add test for parsing with no sample_id_all bit
  perf trace: Check control+C more often

Pull scheduler fix from Ingo Molnar:
 "Performance regression fix"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched: Fix load balancing performance regression in should_we_balance()

This allows us to skip all the crazy spinlocks and reference count
updates, and instead use the fs sequence read-lock to get an atomic
snapshot of the root and cwd information.

We might want to make the rule that "prepend_path()" is always called
with the RCU lock held, but the RCU lock nests fine and this is the
minimal fix.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Let's not pollute the include files with inline functions that are only
used in a single place.  Especially not if we decide we might want to
change the semantics of said function to make it more efficient..
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull btrfs updates from Chris Mason:
 "This is against 3.11-rc7, but was pulled and tested against your tree
  as of yesterday.  We do have two small incrementals queued up, but I
  wanted to get this bunch out the door before I hop on an airplane.

  This is a fairly large batch of fixes, performance improvements, and
  cleanups from the usual Btrfs suspects.

  We've included Stefan Behren's work to index subvolume UUIDs, which is
  targeted at speeding up send/receive with many subvolumes or snapshots
  in place.  It closes a long standing performance issue that was built
  in to the disk format.

  Mark Fasheh's offline dedup work is also here.  In this case offline
  means the FS is mounted and active, but the dedup work is not done
  inline during file IO.  This is a building block where utilities are
  able to ask the FS to dedup a series of extents.  The kernel takes
  care of verifying the data involved really is the same.  Today this
  involves reading both extents, but we'll continue to evolve the
  patches"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (118 commits)
  Btrfs: optimize key searches in btrfs_search_slot
  Btrfs: don't use an async starter for most of our workers
  Btrfs: only update disk_i_size as we remove extents
  Btrfs: fix deadlock in uuid scan kthread
  Btrfs: stop refusing the relocation of chunk 0
  Btrfs: fix memory leak of uuid_root in free_fs_info
  btrfs: reuse kbasename helper
  btrfs: return btrfs error code for dev excl ops err
  Btrfs: allow partial ordered extent completion
  Btrfs: convert all bug_ons in free-space-cache.c
  Btrfs: add support for asserts
  Btrfs: adjust the fs_devices->missing count on unmount
  Btrf: cleanup: don't check for root_refs == 0 twice
  Btrfs: fix for patch "cleanup: don't check the same thing twice"
  Btrfs: get rid of one BUG() in write_all_supers()
  Btrfs: allocate prelim_ref with a slab allocater
  Btrfs: pass gfp_t to __add_prelim_ref() to avoid always using GFP_ATOMIC
  Btrfs: fix race conditions in BTRFS_IOC_FS_INFO ioctl
  Btrfs: fix race between removing a dev and writing sbs
  Btrfs: remove ourselves from the cluster list under lock
  ...

This patch modifies read_seqbegin_or_lock() and need_seqretry() to use
newly introduced read_seqlock_excl() and read_sequnlock_excl()
primitives so that they won't change the sequence number even if they
fall back to take the lock.  This is OK as no change to the protected
data structure is being made.

It will prevent one fallback to lock taking from cascading into a series
of lock taking reducing performance because of the sequence number
change.  It will also allow other sequence readers to go forward while
an exclusive reader lock is taken.

This patch also updates some of the inaccurate comments in the code.
Signed-off-by: Waiman Long <Waiman.Long@hp.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The sequence lock (seqlock) was originally designed for the cases where
the readers do not need to block the writers by making the readers retry
the read operation when the data change.

Since then, the use cases have been expanded to include situations where
a thread does not need to change the data (effectively a reader) at all
but have to take the writer lock because it can't tolerate changes to
the protected structure.  Some examples are the d_path() function and
the getcwd() syscall in fs/dcache.c where the functions take the writer
lock on rename_lock even though they don't need to change anything in
the protected data structure at all.  This is inefficient as a reader is
now blocking other sequence number reading readers from moving forward
by pretending to be a writer.

This patch tries to eliminate this inefficiency by introducing a new
type of locking reader to the seqlock locking mechanism.  This new
locking reader will try to take an exclusive lock preventing other
writers and locking readers from going forward.  However, it won't
affect the progress of the other sequence number reading readers as the
sequence number won't be changed.
Signed-off-by: Waiman Long <Waiman.Long@hp.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull sound fixes from Takashi Iwai:
 "A few last-minute fixes for 3.12-rc1.  All patches are driver
  specific.

   - HD-audio fixes: MacBook 6,1/6,2 speaker fix, ASUS TX300 dock
     speaker fix, Toshiba Satellite irq fix, Haswell HDMI audio
     cleanups)

   - ASoC fixes: atmel irq fix, fsl DT fix, mc13783 spi fix, kirkwood
     compatible string change, etc"

* tag 'sound-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ASoC: mc13783: add spi errata fix
  ASoC: rsnd: fixup flag name of rsnd_scu_platform_info
  ALSA: hda - Add CS4208 codec support for MacBook 6,1 and 6,2
  ALSA: hda - Add Toshiba Satellite C870 to MSI blacklist
  ASoC: fsl_spdif: Select regmap-mmio
  ALSA: hda - unmute pin amplifier in infoframe setup for Haswell
  ALSA: hda - define is_haswell() to check if a display audio codec is Haswell
  ALSA: hda - Add dock speaker support for ASUS TX300
  ASoC: kirkwood: change the compatible string of the kirkwood-i2s driver
  ASoC: atmel: disable error interrupt
  ASoC: fsl: imx-audmux: Do not call imx_audmux_parse_dt_defaults() on non-dt kernel

Pull watchdog updates from Wim Van Sebroeck:
 - New watchdog driver for Allwinner A10/A13
 - some devm_ioremap_resource simplifications
 - a s3c2410_wdt change that removes the global variables

* git://www.linux-watchdog.org/linux-watchdog:
  watchdog: s3c2410_wdt: simplify use of devm_ioremap_resource
  watchdog: simplify platform_get_resource_byname/devm_ioremap_resource
  watchdog: ts72xx_wdt: simplify use of devm_ioremap_resource
  watchdog: nuc900_wdt.c: simplify use of devm_ioremap_resource
  watchdog: sunxi: New watchdog driver for Allwinner A10/A13
  watchdog: s3c2410_wdt: remove the global variables

Pull thermal management updates from Zhang Rui:
 "We have a lot of SOC changes and a few thermal core fixes this time.

  The biggest change is about exynos thermal driver restructure.  The
  patch set adds TMU (Thermal management Unit) driver support for
  exynos5440 platform.  There are 3 instances of the TMU controllers so
  necessary cleanup/re-structure is done to handle multiple thermal
  zone.

  The next biggest change is the introduction of the imx thermal driver.
  It adds the imx thermal support using Temperature Monitor (TEMPMON)
  block found on some Freescale i.MX SoCs.  The driver uses syscon
  regmap interface to access TEMPMON control registers and calibration
  data, and supports cpufreq as the cooling device.

  Highlights:

   - restructure exynos thermal driver.

   - introduce new imx thermal driver.

   - fix a bug in thermal core, which powers on the fans unexpectedly
     after resume from suspend"

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (46 commits)
  drivers: thermal: add check when unregistering cpu cooling
  thermal: thermal_core: allow binding with limits on bind_params
  drivers: thermal: make usage of CONFIG_THERMAL_HWMON optional
  drivers: thermal: parent virtual hwmon with thermal zone
  thermal: hwmon: move hwmon support to single file
  thermal: exynos: Clean up non-DT remnants
  thermal: exynos: Fix potential NULL pointer dereference
  thermal: exynos: Fix typos in Kconfig
  thermal: ti-soc-thermal: Ensure to compute thermal trend
  thermal: ti-soc-thermal: Set the bandgap mask counter delay value
  thermal: ti-soc-thermal: Initialize counter_delay field for TI DRA752 sensors
  thermal: step_wise: return instance->target by default
  thermal: step_wise: cdev only needs update on a new target state
  Thermal/cpu_cooling: Return directly for the cpu out of allowed_cpus in the cpufreq_thermal_notifier()
  thermal: exynos_tmu: fix wrong error check for mapped memory
  thermal: imx: implement thermal alarm interrupt handling
  thermal: imx: dynamic passive and SoC specific critical trip points
  Documentation: thermal: Explain the exynos thermal driver model
  ARM: dts: thermal: exynos: Add documentation for Exynos SoC thermal bindings
  thermal: exynos: Support for TMU regulator defined at device tree
  ...

Pull CIFS fixes from Steve French:
 "CIFS update including case insensitive file name matching improvements
  for UTF-8 to Unicode, various small cifs fixes, SMB2/SMB3 leasing
  improvements, support for following SMB2 symlinks, SMB3 packet signing
  improvements"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6: (25 commits)
  CIFS: Respect epoch value from create lease context v2
  CIFS: Add create lease v2 context for SMB3
  CIFS: Move parsing lease buffer to ops struct
  CIFS: Move creating lease buffer to ops struct
  CIFS: Store lease state itself rather than a mapped oplock value
  CIFS: Replace clientCanCache* bools with an integer
  [CIFS] quiet sparse compile warning
  cifs: Start using per session key for smb2/3 for signature generation
  cifs: Add a variable specific to NTLMSSP for key exchange.
  cifs: Process post session setup code in respective dialect functions.
  CIFS: convert to use le32_add_cpu()
  CIFS: Fix missing lease break
  CIFS: Fix a memory leak when a lease break comes
  cifs: add winucase_convert.pl to Documentation/ directory
  cifs: convert case-insensitive dentry ops to use new case conversion routines
  cifs: add new case-insensitive conversion routines that are based on wchar_t's
  [CIFS] Add Scott to list of cifs contributors
  cifs: Move and expand MAX_SERVER_SIZE definition
  cifs: Expand max share name length to 256
  cifs: Move string length definitions to uapi
  ...

Commit 05b016ec "ARC: Setup Vector Table Base in early boot" moved
the Interrupt vector Table setup out of arc_init_IRQ() which is called
for all CPUs, to entry point of boot cpu only, breaking booting of others.

Fix by adding the same to entry point of non-boot CPUs too.

read_arc_build_cfg_regs() printing IVT Base Register didn't help the
casue since it prints a synthetic value if zero which is totally bogus,
so fix that to print the exact Register.

[vgupta: Remove the now stale comment from header of arc_init_IRQ and
also added the commentary for halt-on-reset]

Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: Cc: <stable@vger.kernel.org> #3.11
Signed-off-by: Noam Camus <noamc@ezchip.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* pm-cpufreq:
  cpufreq: Acquire the lock in cpufreq_policy_restore() for reading
  cpufreq: Prevent problems in update_policy_cpu() if last_cpu == new_cpu
  cpufreq: Restructure if/else block to avoid unintended behavior
  cpufreq: Fix crash in cpufreq-stats during suspend/resume

There was a bug in the handling of SNB-EP/IVB-EP uncore PCI
fixed counters, e.g., IMC.

It would cause erratic values to be returned for the IMC
clockticks event. This was due to a bogus hwc->config value
which was then written to PCI config space.

The erratic values can be seen via:

  $ perf stat -a -C 0 -e uncore_imc_0/clockticks/ -I 1000 sleep 10

The fixed counter has most fields marked as reserved with
hw reset values of 0. Yet the kernel was defaulting to a
hwc->config = ~0 and that was causing the issues.

This patch sets the hwc->config values for fixed uncore event
to 0. Now, the values of IMC clockticks is correct.
Signed-off-by: Stephane Eranian <eranian@google.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: peterz@infradead.org
Cc: zheng.z.yan@intel.com
Link: http://lkml.kernel.org/r/20130909195350.GA17643@google.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

Currently utask->depth is simply the number of allocated/pending
return_instance's in uprobe_task->return_instances list.

handle_trampoline() should decrement this counter every time we
handle/free an instance, but due to typo it does this only if
->chained == T. This means that in the likely case this counter
is never decremented and the probed task can't report more than
MAX_URETPROBE_DEPTH events.
Reported-by: Mikhail Kulemin <Mikhail.Kulemin@ru.ibm.com>
Reported-by: Hemant Kumar Shaw <hkshaw@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Anton Arapov <anton@redhat.com>
Cc: masami.hiramatsu.pt@hitachi.com
Cc: srikar@linux.vnet.ibm.com
Cc: systemtap@sourceware.org
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20130911154726.GA8093@redhat.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

The IvyBridge event CYCLE_ACTIVITY:CYCLES_LDM_PENDING can only
be measured on counters 0-3 when HT is off. When HT is on, you
only have counters 0-3.

If you program it on the eight counters for 1s on a 3GHz
IVB laptop running a noploop, you see:

           2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
           2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
           2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
           2 747 527 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
       3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
       3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
       3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING
       3 280 563 608 CYCLE_ACTIVITY:CYCLES_LDM_PENDING

Clearly the last 4 values are bogus.
Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: ak@linux.intel.com
Cc: zheng.z.yan@intel.com
Cc: dhsharp@google.com
Link: http://lkml.kernel.org/r/20130911152222.GA28761@google.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent

Pull perf/urgent fixes from Arnaldo Carvalho de Melo:

 * Handle perf.data files with no tracepoints in 'perf trace', fixing a
   segfault.

 * Fix up MMAP2 buffer space reservation, a problem that was caught via
   'perf test' consistency tests.

 * Add attr->mmap2 support in the tools, a patch that should've been merged
   together with the kernel counterpart:

     13d7a241 "perf: Add attr->mmap2 attribute to an event".

   Merging it allowed us to catch the MMAP buffer space reservation problem via
   'perf test'. From Stephane Eranian.

   The tools deals with older kernels by disabling this feature, resetting the
   perf_event_attr.mmap2 bit, when -EINVAL is returned by perf_event_open, just
   like with perf_event_attr.{sample_id_all,exclude_{guest,host}}.

   When such fallback happens the perf_missing_features.mmap2 flag is set to
   true and can be used by tooling that strictly needs this feature to check
   for its availability on the running kernel.

 * Make sure we can find PERF_SAMPLE_ID in the variable part of PERF_RECORD_
   ring buffer records in 'perf kvm', where direct manipulation of sample_type
   was being done.

   Fixed by making use of the perf_evlist__set_sample_bit() helper and by
   setting the evlist->id_pos in perf_evlist__open(), from Adrian Hunter.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

This reverts the Linux for Workgroups thing.  And no, before somebody
asks, we're not doing Linux95.  Not for a few years, at least.

Sure, the flag added some color to the logo, and could have remained as
a testament to my leet gimp skills.  But no.  And I'll do this early, to
avoid the chance of forgetting when I'm doing the actual rc1 release on
the road.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge tag 'ecryptfs-3.12-rc1-crypt-ctx' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull eCryptfs fixes from Tyler Hicks:
 "Two small fixes to the code that initializes the per-file crypto
  contexts"

* tag 'ecryptfs-3.12-rc1-crypt-ctx' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  ecryptfs: avoid ctx initialization race
  ecryptfs: remove check for if an array is NULL

Pull DMA-mapping fix from Marek Szyprowski:
 "A build bugfix for the device tree support for reserved memory
  regions.  Due to superfluous include the common code failed to build
  on ARM64 and MIPS architectures.

  The patch that caused the build break has lived at linux-next for
  about two weeks and noone noticed the issue, what convinced me that
  everything was ok"

* 'for-v3.12-fix' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
  drivers: of: fix build break if asm/dma-contiguous.h is missing

Pull dma-buf updates from Sumit Semwal:
 "Yet another small one - dma-buf framework now supports size discovery
  of the buffer via llseek"

* tag 'for-3.12' of git://git.linaro.org/people/sumitsemwal/linux-dma-buf:
  dma-buf: Expose buffer size to userspace (v2)
  dma-buf: Check return value of anon_inode_getfile

Merge first patch-bomb from Andrew Morton:
 - Some pidns/fork/exec tweaks
 - OCFS2 updates
 - Most of MM - there remain quite a few memcg parts which depend on
   pending core cgroups changes.  Which might have been already merged -
   I'll check tomorrow...
 - Various misc stuff all over the place
 - A few block bits which I never got around to sending to Jens -
   relatively minor things.
 - MAINTAINERS maintenance
 - A small number of lib/ updates
 - checkpatch updates
 - epoll
 - firmware/dmi-scan
 - Some kprobes work for S390
 - drivers/rtc updates
 - hfsplus feature work
 - vmcore feature work
 - rbtree upgrades
 - AOE updates
 - pktcdvd cleanups
 - PPS
 - memstick
 - w1
 - New "inittmpfs" feature, which does the obvious
 - More IPC work from Davidlohr.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (303 commits)
  lz4: fix compression/decompression signedness mismatch
  ipc: drop ipc_lock_check
  ipc, shm: drop shm_lock_check
  ipc: drop ipc_lock_by_ptr
  ipc, shm: guard against non-existant vma in shmdt(2)
  ipc: document general ipc locking scheme
  ipc,msg: drop msg_unlock
  ipc: rename ids->rw_mutex
  ipc,shm: shorten critical region for shmat
  ipc,shm: cleanup do_shmat pasta
  ipc,shm: shorten critical region for shmctl
  ipc,shm: make shmctl_nolock lockless
  ipc,shm: introduce shmctl_nolock
  ipc: drop ipcctl_pre_down
  ipc,shm: shorten critical region in shmctl_down
  ipc,shm: introduce lockless functions to obtain the ipc object
  initmpfs: use initramfs if rootfstype= or root= specified
  initmpfs: make rootfs use tmpfs when CONFIG_TMPFS enabled
  initmpfs: move rootfs code from fs/ramfs/ to init/
  initmpfs: move bdi setup from init_rootfs to init_ramfs
  ...

LZ4 compression and decompression functions require different in
signedness input/output parameters: unsigned char for compression and
signed char for decompression.

Change decompression API to require "(const) unsigned char *".
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Kyungsik Lee <kyungsik.lee@lge.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Yann Collet <yann.collet.73@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

No remaining users, we now use ipc_obtain_object_check().
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This function was replaced by a the lockless shm_obtain_object_check(),
and no longer has any users.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

After previous cleanups and optimizations, this function is no longer
heavily used and we don't have a good reason to keep it.  Update the few
remaining callers and get rid of it.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

When !CONFIG_MMU there's a chance we can derefence a NULL pointer when the
VM area isn't found - check the return value of find_vma().

Also, remove the redundant -EINVAL return: retval is set to the proper
return code and *only* changed to 0, when we actually unmap the segments.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

As suggested by Andrew, add a generic initial locking scheme used
throughout all sysv ipc mechanisms.  Documenting the ids rwsem, how rcu
can be enough to do the initial checks and when to actually acquire the
kern_ipc_perm.lock spinlock.

I found that adding it to util.c was generic enough.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

There is only one user left, drop this function and just call
ipc_unlock_object() and rcu_read_unlock().
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Since in some situations the lock can be shared for readers, we shouldn't
be calling it a mutex, rename it to rwsem.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Similar to other system calls, acquire the kern_ipc_perm lock after doing
the initial permission and security checks.

[sasha.levin@oracle.com: dont leave do_shmat with rcu lock held]
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Clean up some of the messy do_shmat() spaghetti code, getting rid of
out_free and out_put_dentry labels.  This makes shortening the critical
region of this function in the next patch a little easier to do and read.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

With the *_INFO, *_STAT, IPC_RMID and IPC_SET commands already optimized,
deal with the remaining SHM_LOCK and SHM_UNLOCK commands.  Take the
shm_perm lock after doing the initial auditing and security checks.  The
rest of the logic remains unchanged.
Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>