We need those sysfs fixes in this branch to make testing, and future
patches apply properly.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Introduce kernfs setattr interface - kernfs_setattr().

sysfs_sd_setattr() is renamed to __kernfs_setattr() and
kernfs_setattr() is a simple wrapper around it with sysfs_mutex
locking.  sysfs_chmod_file() is updated to get an explicit ref on
kobj->sd and then invoke kernfs_setattr() so that it doesn't have to
use internal interface.

This patch doesn't introduce any behavior differences.

v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Introduce kernfs rename interface, krenfs_rename[_ns]().

This is just rename of sysfs_rename().  No functional changes.
Function comment is added to kernfs_rename_ns() and @new_parent_sd is
renamed to @new_parent for consistency with other kernfs interfaces.

v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Separate out kernfs symlink interface - kernfs_create_link() - which
takes and returns sysfs_dirents, from sysfs_do_create_link_sd().
sysfs_do_create_link_sd() now just determines the parent and target
sysfs_dirents and invokes the new interface and handles dup warning.

This patch doesn't introduce behavior changes.

v2: Dummy implementation for !CONFIG_SYSFS updated to return -ENOSYS.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Introduce kernfs removal interfaces - kernfs_remove() and
kernfs_remove_by_name[_ns]().

These are just renames of sysfs_remove() and sysfs_hash_and_remove().
No functional changes.

v2: Dummy kernfs_remove_by_name_ns() for !CONFIG_SYSFS updated to
    return -ENOSYS instead of 0.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Core sysfs implementation will be separated into kernfs so that it can
be used by other non-kobject users.

This patch creates fs/kernfs/ directory and makes boilerplate changes.
kernfs interface will be directly based on sysfs_dirent and its
forward declaration is moved to include/linux/kernfs.h which is
included from include/linux/sysfs.h.  sysfs core implementation will
be gradually separated out and moved to kernfs.

This patch doesn't introduce any functional changes.

v2: mount.c added.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: linux-fsdevel@vger.kernel.org
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Currently the kobject based interface guarantees that a parent
sysfs_dirent is always a directory; however, the planned kernfs
interface will be directly based on sysfs_dirents and the caller may
specify non-directory node as the parent.  Add an explicit check in
__sysfs_add_one() so that such attempts fail with -EINVAL.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The way namespace tags are implemented in sysfs is more complicated
than necessary.  As each tag is a pointer value and required to be
non-NULL under a namespace enabled parent, there's no need to record
separately what type each tag is.  If multiple namespace types are
needed, which currently aren't, we can simply compare the tag to a set
of allowed tags in the superblock assuming that the tags, being
pointers, won't have the same value across multiple types.

This patch rips out kobj_ns_type handling from sysfs.  sysfs now has
an enable switch to turn on namespace under a node.  If enabled, all
children are required to have non-NULL namespace tags and filtered
against the super_block's tag.

kobject namespace determination is now performed in
lib/kobject.c::create_dir() making sysfs_read_ns_type() unnecessary.
The sanity checks are also moved.  create_dir() is restructured to
ease such addition.  This removes most kobject namespace knowledge
from sysfs proper which will enable proper separation and layering of
sysfs.

This is the second try.  The first one was cb26a311 ("sysfs: drop
kobj_ns_type handling") which tried to automatically enable namespace
if there are children with non-NULL namespace tags; however, it was
broken for symlinks as they should inherit the target's tag iff
namespace is enabled in the parent.  This led to namespace filtering
enabled incorrectly for wireless net class devices through phy80211
symlinks and thus network configuration failure.  a1212d27
("Revert "sysfs: drop kobj_ns_type handling"") reverted the commit.

This shouldn't introduce any behavior changes, for real.

v2: Dummy implementation of sysfs_enable_ns() for !CONFIG_SYSFS was
    missing and caused build failure.  Reported by kbuild test robot.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kay Sievers <kay@vrfy.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit 54d71145.

The root cause of these "inverted" sysfs removals have now been found,
so there is no need for this patch.  Keep this functionality around so
that this type of error doesn't show up in driver code again.

Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The following two commits implemented mmap support in the regular file
path and merged bin file support into the regular path.

 73d97146 ("sysfs: copy bin mmap support from fs/sysfs/bin.c to fs/sysfs/file.c")
 3124eb16 ("sysfs: merge regular and bin file handling")

After the merge, the following commands trigger a spurious lockdep
warning.  "test-mmap-read" simply mmaps the file and dumps the
content.

  $ cat /sys/block/sda/trace/act_mask
  $ test-mmap-read /sys/devices/pci0000\:00/0000\:00\:03.0/resource0 4096

  ======================================================
  [ INFO: possible circular locking dependency detected ]
  3.12.0-work+ #378 Not tainted
  -------------------------------------------------------
  test-mmap-read/567 is trying to acquire lock:
   (&of->mutex){+.+.+.}, at: [<ffffffff8120a8df>] sysfs_bin_mmap+0x4f/0x120

  but task is already holding lock:
   (&mm->mmap_sem){++++++}, at: [<ffffffff8114b399>] vm_mmap_pgoff+0x49/0xa0

  which lock already depends on the new lock.

  the existing dependency chain (in reverse order) is:

  -> #3 (&mm->mmap_sem){++++++}:
  ...
  -> #2 (sr_mutex){+.+.+.}:
  ...
  -> #1 (&bdev->bd_mutex){+.+.+.}:
  ...
  -> #0 (&of->mutex){+.+.+.}:
  ...

  other info that might help us debug this:

  Chain exists of:
   &of->mutex --> sr_mutex --> &mm->mmap_sem

   Possible unsafe locking scenario:

	 CPU0                    CPU1
	 ----                    ----
    lock(&mm->mmap_sem);
				 lock(sr_mutex);
				 lock(&mm->mmap_sem);
    lock(&of->mutex);

   *** DEADLOCK ***

  1 lock held by test-mmap-read/567:
   #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff8114b399>] vm_mmap_pgoff+0x49/0xa0

  stack backtrace:
  CPU: 3 PID: 567 Comm: test-mmap-read Not tainted 3.12.0-work+ #378
  Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
   ffffffff81ed41a0 ffff880009441bc8 ffffffff81611ad2 ffffffff81eccb80
   ffff880009441c08 ffffffff8160f215 ffff880009441c60 ffff880009c75208
   0000000000000000 ffff880009c751e0 ffff880009c75208 ffff880009c74ac0
  Call Trace:
   [<ffffffff81611ad2>] dump_stack+0x4e/0x7a
   [<ffffffff8160f215>] print_circular_bug+0x2b0/0x2bf
   [<ffffffff8109ca0a>] __lock_acquire+0x1a3a/0x1e60
   [<ffffffff8109d6ba>] lock_acquire+0x9a/0x1d0
   [<ffffffff81615547>] mutex_lock_nested+0x67/0x3f0
   [<ffffffff8120a8df>] sysfs_bin_mmap+0x4f/0x120
   [<ffffffff8115d363>] mmap_region+0x3b3/0x5b0
   [<ffffffff8115d8ae>] do_mmap_pgoff+0x34e/0x3d0
   [<ffffffff8114b3ba>] vm_mmap_pgoff+0x6a/0xa0
   [<ffffffff8115be3e>] SyS_mmap_pgoff+0xbe/0x250
   [<ffffffff81008282>] SyS_mmap+0x22/0x30
   [<ffffffff8161a4d2>] system_call_fastpath+0x16/0x1b

This happens because one file nests sr_mutex, which nests mm->mmap_sem
under it, under of->mutex while mmap implementation naturally nests
of->mutex under mm->mmap_sem.  The warning is false positive as
of->mutex is per open-file and the two paths belong to two different
files.  This warning didn't trigger before regular and bin file
supports were merged because only bin file supported mmap and the
other side of locking happened only on regular files which used
equivalent but separate locking.

It'd be best if we give separate locking classes per file but we can't
easily do that.  Let's differentiate on ->mmap() for now.  Later we'll
add explicit file operations struct and can add per-ops lockdep key
there.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Commit bcdde7e2 (sysfs: make __sysfs_remove_dir() recursive) changed
the behavior so that directory removals will be done recursively. This
means that the sysfs group might already be removed if its parent directory
has been removed.

The current code outputs warnings similar to following log snippet when it
detects that there is no group for the given kobject:

 WARNING: CPU: 0 PID: 4 at fs/sysfs/group.c:214 sysfs_remove_group+0xc6/0xd0()
 sysfs group ffffffff81c6f1e0 not found for kobject 'host7'
 Modules linked in:
 CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 3.12.0+ #13
 Hardware name:                  /D33217CK, BIOS GKPPT10H.86A.0042.2013.0422.1439 04/22/2013
 Workqueue: kacpi_hotplug acpi_hotplug_work_fn
  0000000000000009 ffff8801002459b0 ffffffff817daab1 ffff8801002459f8
  ffff8801002459e8 ffffffff810436b8 0000000000000000 ffffffff81c6f1e0
  ffff88006d440358 ffff88006d440188 ffff88006e8b4c28 ffff880100245a48
 Call Trace:
  [<ffffffff817daab1>] dump_stack+0x45/0x56
  [<ffffffff810436b8>] warn_slowpath_common+0x78/0xa0
  [<ffffffff81043727>] warn_slowpath_fmt+0x47/0x50
  [<ffffffff811ad319>] ? sysfs_get_dirent_ns+0x49/0x70
  [<ffffffff811ae526>] sysfs_remove_group+0xc6/0xd0
  [<ffffffff81432f7e>] dpm_sysfs_remove+0x3e/0x50
  [<ffffffff8142a0d0>] device_del+0x40/0x1b0
  [<ffffffff8142a24d>] device_unregister+0xd/0x20
  [<ffffffff8144131a>] scsi_remove_host+0xba/0x110
  [<ffffffff8145f526>] ata_host_detach+0xc6/0x100
  [<ffffffff8145f578>] ata_pci_remove_one+0x18/0x20
  [<ffffffff812e8f48>] pci_device_remove+0x28/0x60
  [<ffffffff8142d854>] __device_release_driver+0x64/0xd0
  [<ffffffff8142d8de>] device_release_driver+0x1e/0x30
  [<ffffffff8142d257>] bus_remove_device+0xf7/0x140
  [<ffffffff8142a1b1>] device_del+0x121/0x1b0
  [<ffffffff812e43d4>] pci_stop_bus_device+0x94/0xa0
  [<ffffffff812e437b>] pci_stop_bus_device+0x3b/0xa0
  [<ffffffff812e437b>] pci_stop_bus_device+0x3b/0xa0
  [<ffffffff812e44dd>] pci_stop_and_remove_bus_device+0xd/0x20
  [<ffffffff812fc743>] trim_stale_devices+0x73/0xe0
  [<ffffffff812fc78b>] trim_stale_devices+0xbb/0xe0
  [<ffffffff812fc78b>] trim_stale_devices+0xbb/0xe0
  [<ffffffff812fcb6e>] acpiphp_check_bridge+0x7e/0xd0
  [<ffffffff812fd90d>] hotplug_event+0xcd/0x160
  [<ffffffff812fd9c5>] hotplug_event_work+0x25/0x60
  [<ffffffff81316749>] acpi_hotplug_work_fn+0x17/0x22
  [<ffffffff8105cf3a>] process_one_work+0x17a/0x430
  [<ffffffff8105db29>] worker_thread+0x119/0x390
  [<ffffffff8105da10>] ? manage_workers.isra.25+0x2a0/0x2a0
  [<ffffffff81063a5d>] kthread+0xcd/0xf0
  [<ffffffff81063990>] ? kthread_create_on_node+0x180/0x180
  [<ffffffff817eb33c>] ret_from_fork+0x7c/0xb0
  [<ffffffff81063990>] ? kthread_create_on_node+0x180/0x180

On this particular machine I see ~16 of these message during Thunderbolt
hot-unplug.

Fix this in similar way that was done for sysfs_remove_one() by checking
if the parent directory has already been removed and bailing out early.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge tag 'ecryptfs-3.13-rc1-quiet-checkers' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs

Pull minor eCryptfs fix from Tyler Hicks:
 "Quiet static checkers by removing unneeded conditionals"

* tag 'ecryptfs-3.13-rc1-quiet-checkers' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
  eCryptfs: file->private_data is always valid

Pull second set of sound fixes from Takashi Iwai:
 "A collection of small fixes in HD-audio quirks and runtime PM, ASoC
  rcar, abs8500 and other codecs.  Most of commits are for stable
  kernels, too"

* tag 'sound-fix2-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda - Set current_headset_type to ALC_HEADSET_TYPE_ENUM (janitorial)
  ALSA: hda - Provide missing pin configs for VAIO with ALC260
  ALSA: hda - Add headset quirk for Dell Inspiron 3135
  ALSA: hda - Fix the headphone jack detection on Sony VAIO TX
  ALSA: hda - Fix missing bass speaker on ASUS N550
  ALSA: hda - Fix unbalanced runtime PM notification at resume
  ASoC: arizona: Set FLL to free-run before disabling
  ALSA: hda - A casual Dell Headset quirk
  ASoC: rcar: fixup dma_async_issue_pending() timing
  ASoC: rcar: off by one in rsnd_scu_set_route()
  ASoC: wm5110: Add post SYSCLK register patch for rev D chip
  ASoC: ab8500: Revert to using custom I/O functions
  ALSA: hda - Also enable mute/micmute LED control for "Lenovo dock" fixup
  ALSA: firewire-lib: include sound/asound.h to refer to snd_pcm_format_t
  ALSA: hda - Select FW_LOADER from CONFIG_SND_HDA_CODEC_CA0132_DSP
  ALSA: hda - Enable mute/mic-mute LEDs for more Thinkpads with Realtek codec
  ASoC: rcar: fixup mod access before checking

Pull DRM fixes from Dave Airlie:
 "I was going to leave this until post -rc1 but sysfs fixes broke
  hotplug in userspace, so I had to fix it harder, otherwise a set of
  pulls from intel, radeon and vmware,

  The vmware/ttm changes are bit larger but since its early and they are
  unlikely to break anything else I put them in, it lets vmware work
  with dri3"

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (36 commits)
  drm/sysfs: fix hotplug regression since lifetime changes
  drm/exynos: g2d: fix memory leak to userptr
  drm/i915: Fix gen3 self-refresh watermarks
  drm/ttm: Remove set_need_resched from the ttm fault handler
  drm/ttm: Don't move non-existing data
  drm/radeon: hook up backlight functions for CI and KV family.
  drm/i915: Replicate BIOS eDP bpp clamping hack for hsw
  drm/i915: Do not enable package C8 on unsupported hardware
  drm/i915: Hold pc8 lock around toggling pc8.gpu_idle
  drm/i915: encoder->get_config is no longer optional
  drm/i915/tv: add ->get_config callback
  drm/radeon/cik: Add macrotile mode array query
  drm/radeon/cik: Return backend map information to userspace
  drm/vmwgfx: Make vmwgfx dma buffers prime aware
  drm/vmwgfx: Make surfaces prime-aware
  drm/vmwgfx: Hook up the prime ioctls
  drm/ttm: Add a minimal prime implementation for ttm base objects
  drm/vmwgfx: Fix false lockdep warning
  drm/ttm: Allow execbuf util reserves without ticket
  drm/i915: restore the early forcewake cleanup
  ...

Pull PCI updates from Bjorn Helgaas:
 "Miscellaneous
   - Remove duplicate disable from pcie_portdrv_remove() (Yinghai Lu)
   - Fix whitespace, capitalization, and spelling errors (Bjorn Helgaas)"

* tag 'pci-v3.13-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: Remove duplicate pci_disable_device() from pcie_portdrv_remove()
  PCI: Fix whitespace, capitalization, and spelling errors

Pull SCSI target updates from Nicholas Bellinger:
 "Things have been quiet this round with mostly bugfixes, percpu
  conversions, and other minor iscsi-target conformance testing changes.

  The highlights include:

   - Add demo_mode_discovery attribute for iscsi-target (Thomas)
   - Convert tcm_fc(FCoE) to use percpu-ida pre-allocation
   - Add send completion interrupt coalescing for ib_isert
   - Convert target-core to use percpu-refcounting for se_lun
   - Fix mutex_trylock usage bug in iscsit_increment_maxcmdsn
   - tcm_loop updates (Hannes)
   - target-core ALUA cleanups + prep for v3.14 SCSI Referrals support (Hannes)

  v3.14 is currently shaping to be a busy development cycle in target
  land, with initial support for T10 Referrals and T10 DIF currently on
  the roadmap"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending: (40 commits)
  iscsi-target: chap auth shouldn't match username with trailing garbage
  iscsi-target: fix extract_param to handle buffer length corner case
  iscsi-target: Expose default_erl as TPG attribute
  target_core_configfs: split up ALUA supported states
  target_core_alua: Make supported states configurable
  target_core_alua: Store supported ALUA states
  target_core_alua: Rename ALUA_ACCESS_STATE_OPTIMIZED
  target_core_alua: spellcheck
  target core: rename (ex,im)plict -> (ex,im)plicit
  percpu-refcount: Add percpu-refcount.o to obj-y
  iscsi-target: Do not reject non-immediate CmdSNs exceeding MaxCmdSN
  iscsi-target: Convert iscsi_session statistics to atomic_long_t
  target: Convert se_device statistics to atomic_long_t
  target: Fix delayed Task Aborted Status (TAS) handling bug
  iscsi-target: Reject unsupported multi PDU text command sequence
  ib_isert: Avoid duplicate iscsit_increment_maxcmdsn call
  iscsi-target: Fix mutex_trylock usage in iscsit_increment_maxcmdsn
  target: Core does not need blkdev.h
  target: Pass through I/O topology for block backstores
  iser-target: Avoid using FRMR for single dma entry requests
  ...

Pull hwmon fixes from Guenter Roeck:
 - acpi_power_meter: Fix return value check from call to
   acpi_bus_get_device
 - nct6775: Fix/improve NCT6791 support
 - lm75: Add support for GMT G751

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (acpi_power_meter) Fix acpi_bus_get_device() return value check
  hwmon: (nct6775) NCT6791 supports weight control only for CPUFAN
  hwmon: (nct6775) Monitor additional temperature registers
  hwmon: (lm75) Add support for GMT G751 chip

Pull networking fixes from David Miller:

 1) Fix memory leaks and other issues in mwifiex driver, from Amitkumar
    Karwar.

 2) skb_segment() can choke on packets using frag lists, fix from
    Herbert Xu with help from Eric Dumazet and others.

 3) IPv4 output cached route instantiation properly handles races
    involving two threads trying to install the same route, but we
    forgot to propagate this logic to input routes as well.  Fix from
    Alexei Starovoitov.

 4) Put protections in place to make sure that recvmsg() paths never
    accidently copy uninitialized memory back into userspace and also
    make sure that we never try to use more that sockaddr_storage for
    building the on-kernel-stack copy of a sockaddr.  Fixes from Hannes
    Frederic Sowa.

 5) R8152 driver transmit flow bug fixes from Hayes Wang.

 6) Fix some minor fallouts from genetlink changes, from Johannes Berg
    and Michael Opdenacker.

 7) AF_PACKET sendmsg path can race with netdevice unregister notifier,
    fix by using RCU to make sure the network device doesn't go away
    from under us.  Fix from Daniel Borkmann.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (43 commits)
  gso: handle new frag_list of frags GRO packets
  genetlink: fix genl_set_err() group ID
  genetlink: fix genlmsg_multicast() bug
  packet: fix use after free race in send path when dev is released
  xen-netback: stop the VIF thread before unbinding IRQs
  wimax: remove dead code
  net/phy: Add the autocross feature for forced links on VSC82x4
  net/phy: Add VSC8662 support
  net/phy: Add VSC8574 support
  net/phy: Add VSC8234 support
  net: add BUG_ON if kernel advertises msg_namelen > sizeof(struct sockaddr_storage)
  net: rework recvmsg handler msg_name and msg_namelen logic
  bridge: flush br's address entry in fdb when remove the
  net: core: Always propagate flag changes to interfaces
  ipv4: fix race in concurrent ip_route_input_slow()
  r8152: fix incorrect type in assignment
  r8152: support stopping/waking tx queue
  r8152: modify the tx flow
  r8152: fix tx/rx memory overflow
  netfilter: ebt_ip6: fix source and destination matching
  ...

Pull ARM fixes from Russell King:
 "Some small fixes for this merge window, most of them quite self
  explanatory - the biggest thing here is a fix for the ARMv7 LPAE
  suspend/resume support"

* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
  ARM: 7894/1: kconfig: select GENERIC_CLOCKEVENTS if HAVE_ARM_ARCH_TIMER
  ARM: 7893/1: bitops: only emit .arch_extension mp if CONFIG_SMP
  ARM: 7892/1: Fix warning for V7M builds
  ARM: 7888/1: seccomp: not compatible with ARM OABI
  ARM: 7886/1: make OABI default to off
  ARM: 7885/1: Save/Restore 64-bit TTBR registers on LPAE suspend/resume
  ARM: 7884/1: mm: Fix ECC mem policy printk
  ARM: 7883/1: fix mov to mvn conversion in case of 64 bit phys_addr_t and BE
  ARM: 7882/1: mm: fix __phys_to_virt to work with 64 bit phys_addr_t in BE case
  ARM: 7881/1: __fixup_smp read of SCU config should do byteswap in BE case
  ARM: Fix nommu.c build warning

Pull KVM fixes from Gleb Natapov.

* 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: kvm_clear_guest_page(): fix empty_zero_page usage
  kvm: mmu: delay mmu audit activation
  arm/arm64: KVM: Fix hyp mappings of vmalloc regions

Pull aio fixes from Benjamin LaHaise.

* git://git.kvack.org/~bcrl/aio-next:
  aio: nullify aio->ring_pages after freeing it
  aio: prevent double free in ioctx_alloc
  aio: Fix a trinity splat

Pull nfsd bugfixes from Bruce Fields:
 "A couple nfsd bugfixes"

* 'for-3.13' of git://linux-nfs.org/~bfields/linux:
  nfsd4: fix xdr decoding of large non-write compounds
  nfsd: make sure to balance get/put_write_access
  nfsd: split up nfsd_setattr

Pull GFS2 fixes from Steven Whitehouse:
 "A couple of small, but important bug fixes for GFS2.  The first one
  fixes a possible NULL pointer dereference, and the second one resolves
  a reference counting issue in one of the lesser used paths through
  atomic_open"

* tag 'gfs2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-3.0-fixes:
  GFS2: Fix ref count bug relating to atomic_open
  GFS2: fix potential NULL pointer dereference

Pull btrfs fixes from Chris Mason:
 "Almost all of these are bug fixes.  Dave Sterba's documentation update
  is the big exception because he removed our promises to set any
  machine running Btrfs on fire"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Documentation: filesystems: update btrfs tools section
  Documentation: filesystems: add new btrfs mount options
  btrfs: update kconfig help text
  btrfs: fix bio_size_ok() for max_sectors > 0xffff
  btrfs: Use trace condition for get_extent tracepoint
  btrfs: fix typo in the log message
  Btrfs: fix list delete warning when removing ordered root from the list
  Btrfs: print bytenr instead of page pointer in check-int
  Btrfs: remove dead codes from ctree.h
  Btrfs: don't wait for ordered data outside desired range
  Btrfs: fix lockdep error in async commit
  Btrfs: avoid heavy operations in btrfs_commit_super
  Btrfs: fix __btrfs_start_workers retval
  Btrfs: disable online raid-repair on ro mounts
  Btrfs: do not inc uncorrectable_errors counter on ro scrubs
  Btrfs: only drop modified extents if we logged the whole inode
  Btrfs: make sure to copy everything if we rename
  Btrfs: don't BUG_ON() if we get an error walking backrefs

Pull second xfs update from Ben Myers:
 "There are a couple of patches that I wasn't quite sure about in time
  for our initial 3.13 pull request, a bugfix, and an update to add Dave
  to MAINTAINERS:

  Here we have a performance fix for inode iversion, increased inode
  cluster size for v5 superblock filesystems, a fix for error handling
  in xfs_bmap_add_attrfork, and a MAINTAINERS update to add Dave"

* tag 'xfs-for-linus-v3.13-rc1-2' of git://oss.sgi.com/xfs/xfs:
  xfs: open code inc_inode_iversion when logging an inode
  xfs: increase inode cluster size for v5 filesystems
  xfs: fix unlock in xfs_bmap_add_attrfork
  xfs: update maintainers

Pull SLAB changes from Pekka Enberg:
 "The patches from Joonsoo Kim switch mm/slab.c to use 'struct page' for
  slab internals similar to mm/slub.c.  This reduces memory usage and
  improves performance:

    https://lkml.org/lkml/2013/10/16/155

  Rest of the changes are bug fixes from various people"

* 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux: (21 commits)
  mm, slub: fix the typo in mm/slub.c
  mm, slub: fix the typo in include/linux/slub_def.h
  slub: Handle NULL parameter in kmem_cache_flags
  slab: replace non-existing 'struct freelist *' with 'void *'
  slab: fix to calm down kmemleak warning
  slub: proper kmemleak tracking if CONFIG_SLUB_DEBUG disabled
  slab: rename slab_bufctl to slab_freelist
  slab: remove useless statement for checking pfmemalloc
  slab: use struct page for slab management
  slab: replace free and inuse in struct slab with newly introduced active
  slab: remove SLAB_LIMIT
  slab: remove kmem_bufctl_t
  slab: change the management method of free objects of the slab
  slab: use __GFP_COMP flag for allocating slab pages
  slab: use well-defined macro, virt_to_slab()
  slab: overloading the RCU head over the LRU for RCU free
  slab: remove cachep in struct slab_rcu
  slab: remove nodeid in struct slab
  slab: remove colouroff in struct slab
  slab: change return type of kmem_getpages() to struct page
  ...

Pull third set of powerpc updates from Benjamin Herrenschmidt:
 "This is a small collection of random bug fixes and a few improvements
  of Oops output which I deemed valuable enough to include as well.

  The fixes are essentially recent build breakage and regressions, and a
  couple of older bugs such as the DTL log duplication, the EEH issue
  with PCI_COMMAND_MASTER and the problem with small contexts passed to
  get/set_context with VSX enabled"

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/signals: Mark VSX not saved with small contexts
  powerpc/pseries: Fix SMP=n build of rng.c
  powerpc: Make cpu_to_chip_id() available when SMP=n
  powerpc/vio: Fix a dma_mask issue of vio
  powerpc: booke: Fix build failures
  powerpc: ppc64 address space capped at 32TB, mmap randomisation disabled
  powerpc: Only print PACATMSCRATCH in oops when TM is active
  powerpc/pseries: Duplicate dtl entries sometimes sent to userspace
  powerpc: Remove a few lines of oops output
  powerpc: Print DAR and DSISR on machine check oopses
  powerpc: Fix __get_user_pages_fast() irq handling
  powerpc/eeh: More accurate log
  powerpc/eeh: Enable PCI_COMMAND_MASTER for PCI bridges

current_headset_type should be of the HEADSET_TYPE enum, not the
HEADSET_MODE enum. Since ALC_HEADSET_TYPE_UNKNOWN and ALC_HEADSET_MODE_UNKNOWN
are both 0, this patch is just janitorial.
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Some models (or maybe depending on BIOS version) of Sony VAIO with
ALC260 give no proper pin configurations as default, resulting in the
non-working speaker, etc.  Just provide the whole pin configurations
via a fixup.
Reported-by: Matthew Markus <mmarkus@hearit.co>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Merge patches from Andrew Morton:
 "13 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  mm: place page->pmd_huge_pte to right union
  MAINTAINERS: add keyboard driver to Hyper-V file list
  x86, mm: do not leak page->ptl for pmd page tables
  ipc,shm: correct error return value in shmctl (SHM_UNLOCK)
  mm, mempolicy: silence gcc warning
  block/partitions/efi.c: fix bound check
  ARM: drivers/rtc/rtc-at91rm9200.c: disable interrupts at shutdown
  mm: hugetlbfs: fix hugetlbfs optimization
  kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS cleanly
  ipc,shm: fix shm_file deletion races
  mm: thp: give transparent hugepage code a separate copy_page
  checkpatch: fix "Use of uninitialized value" warnings
  configfs: fix race between dentry put and lookup

Pull security subsystem updates from James Morris:
 "In this patchset, we finally get an SELinux update, with Paul Moore
  taking over as maintainer of that code.

  Also a significant update for the Keys subsystem, as well as
  maintenance updates to Smack, IMA, TPM, and Apparmor"

and since I wanted to know more about the updates to key handling,
here's the explanation from David Howells on that:

 "Okay.  There are a number of separate bits.  I'll go over the big bits
  and the odd important other bit, most of the smaller bits are just
  fixes and cleanups.  If you want the small bits accounting for, I can
  do that too.

   (1) Keyring capacity expansion.

        KEYS: Consolidate the concept of an 'index key' for key access
        KEYS: Introduce a search context structure
        KEYS: Search for auth-key by name rather than target key ID
        Add a generic associative array implementation.
        KEYS: Expand the capacity of a keyring

     Several of the patches are providing an expansion of the capacity of a
     keyring.  Currently, the maximum size of a keyring payload is one page.
     Subtract a small header and then divide up into pointers, that only gives
     you ~500 pointers on an x86_64 box.  However, since the NFS idmapper uses
     a keyring to store ID mapping data, that has proven to be insufficient to
     the cause.

     Whatever data structure I use to handle the keyring payload, it can only
     store pointers to keys, not the keys themselves because several keyrings
     may point to a single key.  This precludes inserting, say, and rb_node
     struct into the key struct for this purpose.

     I could make an rbtree of records such that each record has an rb_node
     and a key pointer, but that would use four words of space per key stored
     in the keyring.  It would, however, be able to use much existing code.

     I selected instead a non-rebalancing radix-tree type approach as that
     could have a better space-used/key-pointer ratio.  I could have used the
     radix tree implementation that we already have and insert keys into it by
     their serial numbers, but that means any sort of search must iterate over
     the whole radix tree.  Further, its nodes are a bit on the capacious side
     for what I want - especially given that key serial numbers are randomly
     allocated, thus leaving a lot of empty space in the tree.

     So what I have is an associative array that internally is a radix-tree
     with 16 pointers per node where the index key is constructed from the key
     type pointer and the key description.  This means that an exact lookup by
     type+description is very fast as this tells us how to navigate directly to
     the target key.

     I made the data structure general in lib/assoc_array.c as far as it is
     concerned, its index key is just a sequence of bits that leads to a
     pointer.  It's possible that someone else will be able to make use of it
     also.  FS-Cache might, for example.

   (2) Mark keys as 'trusted' and keyrings as 'trusted only'.

        KEYS: verify a certificate is signed by a 'trusted' key
        KEYS: Make the system 'trusted' keyring viewable by userspace
        KEYS: Add a 'trusted' flag and a 'trusted only' flag
        KEYS: Separate the kernel signature checking keyring from module signing

     These patches allow keys carrying asymmetric public keys to be marked as
     being 'trusted' and allow keyrings to be marked as only permitting the
     addition or linkage of trusted keys.

     Keys loaded from hardware during kernel boot or compiled into the kernel
     during build are marked as being trusted automatically.  New keys can be
     loaded at runtime with add_key().  They are checked against the system
     keyring contents and if their signatures can be validated with keys that
     are already marked trusted, then they are marked trusted also and can
     thus be added into the master keyring.

     Patches from Mimi Zohar make this usable with the IMA keyrings also.

   (3) Remove the date checks on the key used to validate a module signature.

        X.509: Remove certificate date checks

     It's not reasonable to reject a signature just because the key that it was
     generated with is no longer valid datewise - especially if the kernel
     hasn't yet managed to set the system clock when the first module is
     loaded - so just remove those checks.

   (4) Make it simpler to deal with additional X.509 being loaded into the kernel.

        KEYS: Load *.x509 files into kernel keyring
        KEYS: Have make canonicalise the paths of the X.509 certs better to deduplicate

     The builder of the kernel now just places files with the extension ".x509"
     into the kernel source or build trees and they're concatenated by the
     kernel build and stuffed into the appropriate section.

   (5) Add support for userspace kerberos to use keyrings.

        KEYS: Add per-user_namespace registers for persistent per-UID kerberos caches
        KEYS: Implement a big key type that can save to tmpfs

     Fedora went to, by default, storing kerberos tickets and tokens in tmpfs.
     We looked at storing it in keyrings instead as that confers certain
     advantages such as tickets being automatically deleted after a certain
     amount of time and the ability for the kernel to get at these tokens more
     easily.

     To make this work, two things were needed:

     (a) A way for the tickets to persist beyond the lifetime of all a user's
         sessions so that cron-driven processes can still use them.

         The problem is that a user's session keyrings are deleted when the
         session that spawned them logs out and the user's user keyring is
         deleted when the UID is deleted (typically when the last log out
         happens), so neither of these places is suitable.

         I've added a system keyring into which a 'persistent' keyring is
         created for each UID on request.  Each time a user requests their
         persistent keyring, the expiry time on it is set anew.  If the user
         doesn't ask for it for, say, three days, the keyring is automatically
         expired and garbage collected using the existing gc.  All the kerberos
         tokens it held are then also gc'd.

     (b) A key type that can hold really big tickets (up to 1MB in size).

         The problem is that Active Directory can return huge tickets with lots
         of auxiliary data attached.  We don't, however, want to eat up huge
         tracts of unswappable kernel space for this, so if the ticket is
         greater than a certain size, we create a swappable shmem file and dump
         the contents in there and just live with the fact we then have an
         inode and a dentry overhead.  If the ticket is smaller than that, we
         slap it in a kmalloc()'d buffer"

* 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (121 commits)
  KEYS: Fix keyring content gc scanner
  KEYS: Fix error handling in big_key instantiation
  KEYS: Fix UID check in keyctl_get_persistent()
  KEYS: The RSA public key algorithm needs to select MPILIB
  ima: define '_ima' as a builtin 'trusted' keyring
  ima: extend the measurement list to include the file signature
  kernel/system_certificate.S: use real contents instead of macro GLOBAL()
  KEYS: fix error return code in big_key_instantiate()
  KEYS: Fix keyring quota misaccounting on key replacement and unlink
  KEYS: Fix a race between negating a key and reading the error set
  KEYS: Make BIG_KEYS boolean
  apparmor: remove the "task" arg from may_change_ptraced_domain()
  apparmor: remove parent task info from audit logging
  apparmor: remove tsk field from the apparmor_audit_struct
  apparmor: fix capability to not use the current task, during reporting
  Smack: Ptrace access check mode
  ima: provide hash algo info in the xattr
  ima: enable support for larger default filedata hash algorithms
  ima: define kernel parameter 'ima_template=' to change configured default
  ima: add Kconfig default measurement list template
  ...

Pull audit updates from Eric Paris:
 "Nothing amazing.  Formatting, small bug fixes, couple of fixes where
  we didn't get records due to some old VFS changes, and a change to how
  we collect execve info..."

Fixed conflict in fs/exec.c as per Eric and linux-next.

* git://git.infradead.org/users/eparis/audit: (28 commits)
  audit: fix type of sessionid in audit_set_loginuid()
  audit: call audit_bprm() only once to add AUDIT_EXECVE information
  audit: move audit_aux_data_execve contents into audit_context union
  audit: remove unused envc member of audit_aux_data_execve
  audit: Kill the unused struct audit_aux_data_capset
  audit: do not reject all AUDIT_INODE filter types
  audit: suppress stock memalloc failure warnings since already managed
  audit: log the audit_names record type
  audit: add child record before the create to handle case where create fails
  audit: use given values in tty_audit enable api
  audit: use nlmsg_len() to get message payload length
  audit: use memset instead of trying to initialize field by field
  audit: fix info leak in AUDIT_GET requests
  audit: update AUDIT_INODE filter rule to comparator function
  audit: audit feature to set loginuid immutable
  audit: audit feature to only allow unsetting the loginuid
  audit: allow unsetting the loginuid (with priv)
  audit: remove CONFIG_AUDIT_LOGINUID_IMMUTABLE
  audit: loginuid functions coding style
  selinux: apply selinux checks on new audit message types
  ...

I don't know what went wrong, mis-merge or something, but ->pmd_huge_pte
placed in wrong union within struct page.

In original patch[1] it's placed to union with ->lru and ->slab, but in
commit e009bb30 ("mm: implement split page table lock for PMD
level") it's in union with ->index and ->freelist.

That union seems also unused for pages with table tables and safe to
re-use, but it's not what I've tested.

Let's move it to original place.  It fixes indentation at least.  :)

[1] https://lkml.org/lkml/2013/10/7/288Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

There are two code paths how page with pmd page table can be freed:
pmd_free() and pmd_free_tlb().

I've missed the second one and didn't add page table destructor call
there.  It leads to leak of page->ptl for pmd page tables, if
dynamically allocated page->ptl is in use.

The patch adds the missed destructor and modifies documentation
accordingly.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Andrey Vagin <avagin@openvz.org>
Tested-by: Andrey Vagin <avagin@openvz.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 2caacaa8 ("ipc,shm: shorten critical region for shmctl")
restructured the ipc shm to shorten critical region, but introduced a
path where the return value could be -EPERM, even if the operation
actually was performed.

Before the commit, the err return value was reset by the return value
from security_shm_shmctl() after the if (!ns_capable(...)) statement.

Now, we still exit the if statement with err set to -EPERM, and in the
case of SHM_UNLOCK, it is not reset at all, and used as the return value
from shmctl.

To fix this, we only set err when errors occur, leaving the fallthrough
case alone.
Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Davidlohr Bueso <davidlohr@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: <stable@vger.kernel.org>	[3.12.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Fengguang Wu reports that compiling mm/mempolicy.c results in a warning:

  mm/mempolicy.c: In function 'mpol_to_str':
  mm/mempolicy.c:2878:2: error: format not a string literal and no format arguments

Kees says this is because he is using -Wformat-security.

Silence the warning.
Signed-off-by: David Rientjes <rientjes@google.com>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Suggested-by: Kees Cook <keescook@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Use ARRAY_SIZE instead of sizeof to get proper max for label length.

Since this is just a read out of bounds it's not that bad, but the
problem becomes user-visible eg if one tries to use DEBUG_PAGEALLOC and
DEBUG_RODATA, at least with some enhancements from Hiroshi.  Of course
the destination array can contain garbage when we read beyond the end of
source array so that would be another user-visible problem.
Signed-off-by: Antti P Miettinen <amiettinen@nvidia.com>
Reviewed-by: Hiroshi Doyu <hdoyu@nvidia.com>
Tested-by: Hiroshi Doyu <hdoyu@nvidia.com>
Cc: Will Drewry <wad@chromium.org>
Cc: Matt Fleming <matt.fleming@intel.com>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Make sure RTC-interrupts are disabled at shutdown.

As the RTC is generally powered by backup power (VDDBU), its interrupts
are not disabled on wake-up, user, watchdog or software reset.  This
could cause troubles on other systems (e.g.  older kernels) if an
interrupt occurs before a handler has been installed at next boot.

Let us be well-behaved and disable them on clean shutdowns at least (as
do the RTT-based rtc-at91sam9 driver).
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>