* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  fs: simplify iget & friends
  fs: pull inode->i_lock up out of writeback_single_inode
  fs: rename inode_lock to inode_hash_lock
  fs: move i_wb_list out from under inode_lock
  fs: move i_sb_list out from under inode_lock
  fs: remove inode_lock from iput_final and prune_icache
  fs: Lock the inode LRU list separately
  fs: factor inode disposal
  fs: protect inode->i_state with inode->i_lock
  autofs4: Do not potentially dereference NULL pointer returned by fget() in autofs_dev_ioctl_setpipefd()
  autofs4 - remove autofs4_lock
  autofs4 - fix d_manage() return on rcu-walk
  autofs4 - fix autofs4_expire_indirect() traversal
  autofs4 - fix dentry leak in autofs4_expire_direct()
  autofs4 - reinstate last used update on access
  vfs - check non-mountpoint dentry might block in __follow_mount_rcu()

Fix the following compile failure:

  drivers/media/rc/ite-cir.c: In function 'ite_decode_bytes':
  drivers/media/rc/ite-cir.c:190: error: implicit declaration of function 'generic_find_next_le_bit'
  drivers/media/rc/ite-cir.c:199: error: implicit declaration of function 'generic_find_next_zero_le_bit'

Caused by commit 620a32bb ("[media] rc: New rc-based ite-cir driver
for several ITE CIRs") interacting with commit c4945b9e
("asm-generic: rename generic little-endian bitops functions").
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Merge get_new_inode/get_new_inode_fast into iget5_locked/iget_locked
as those were the only callers.  Remove the internal ifind/ifind_fast
helpers - ifind_fast only had a single caller, and ifind had two
callers wanting it to do different things.  Also clean up the comments
in this area to focus on information important to a developer trying
to use it, instead of overloading them with implementation details.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

First thing we do in writeback_single_inode() is take the i_lock and
the last thing we do is drop it. A caller already holds the i_lock,
so pull the i_lock out of writeback_single_inode() to reduce the
round trips on this lock during inode writeback.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

All that remains of the inode_lock is protecting the inode hash list
manipulation and traversals. Rename the inode_lock to
inode_hash_lock to reflect it's actual function.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Protect the inode writeback list with a new global lock
inode_wb_list_lock and use it to protect the list manipulations and
traversals. This lock replaces the inode_lock as the inodes on the
list can be validity checked while holding the inode->i_lock and
hence the inode_lock is no longer needed to protect the list.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Protect the per-sb inode list with a new global lock
inode_sb_list_lock and use it to protect the list manipulations and
traversals. This lock replaces the inode_lock as the inodes on the
list can be validity checked while holding the inode->i_lock and
hence the inode_lock is no longer needed to protect the list.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Now that inode state changes are protected by the inode->i_lock and
the inode LRU manipulations by the inode_lru_lock, we can remove the
inode_lock from prune_icache and the initial part of iput_final().

instead of using the inode_lock to protect the inode during
iput_final, use the inode->i_lock instead. This protects the inode
against new references being taken while we change the inode state
to I_FREEING, as well as preventing prune_icache from grabbing the
inode while we are manipulating it. Hence we no longer need the
inode_lock in iput_final prior to setting I_FREEING on the inode.

For prune_icache, we no longer need the inode_lock to protect the
LRU list, and the inodes themselves are protected against freeing
races by the inode->i_lock. Hence we can lift the inode_lock from
prune_icache as well.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Introduce the inode_lru_lock to protect the inode_lru list. This
lock is nested inside the inode->i_lock to allow the inode to be
added to the LRU list in iput_final without needing to deal with
lock inversions. This keeps iput_final() clean and neat.

Further, where marking the inode I_FREEING and removing it from the
LRU, move the LRU list manipulation within the inode->i_lock to keep
the list manipulation consistent with iput_final. This also means
that most of the open coded LRU list removal + unused inode
accounting can now use the inode_lru_list_del() wrappers which
cleans the code up further.

However, this locking change means what the LRU traversal in
prune_icache() inverts this lock ordering and needs to use trylock
semantics on the inode->i_lock to avoid deadlocking. In these cases,
if we fail to lock the inode we move it to the back of the LRU to
prevent spinning on it.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

We have a couple of places that dispose of inodes. factor the
disposal into evict() to isolate this code and make it simpler to
peel away the inode_lock from the code.

While doing this, change the logic flow in iput_final() to separate
the different cases that need to be handled to make the transitions
the inode goes through more obvious.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Protect inode state transitions and validity checks with the
inode->i_lock. This enables us to make inode state transitions
independently of the inode_lock and is the first step to peeling
away the inode_lock from the code.

This requires that __iget() is done atomically with i_state checks
during list traversals so that we don't race with another thread
marking the inode I_FREEING between the state check and grabbing the
reference.

Also remove the unlock_new_inode() memory barrier optimisation
required to avoid taking the inode_lock when clearing I_NEW.
Simplify the code by simply taking the inode->i_lock around the
state change and wakeup. Because the wakeup is no longer tricky,
remove the wake_up_inode() function and open code the wakeup where
necessary.
Signed-off-by: NDave Chinner <dchinner@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

* 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  SLUB: Write to per cpu data when allocating it
  slub: Fix debugobjects with lockless fastpath

Commit ddd588b5 ("oom: suppress nodes that are not allowed from
meminfo on oom kill") moved lib/show_mem.o out of lib/lib.a, which
resulted in build warnings on all architectures that implement their own
versions of show_mem():

	lib/lib.a(show_mem.o): In function `show_mem':
	show_mem.c:(.text+0x1f4): multiple definition of `show_mem'
	arch/sparc/mm/built-in.o:(.text+0xd70): first defined here

The fix is to remove __show_mem() and add its argument to show_mem() in
all implementations to prevent this breakage.

Architectures that implement their own show_mem() actually don't do
anything with the argument yet, but they could be made to filter nodes
that aren't allowed in the current context in the future just like the
generic implementation.
Reported-by: NStephen Rothwell <sfr@canb.auug.org.au>
Reported-by: NJames Bottomley <James.Bottomley@hansenpartnership.com>
Suggested-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid Rientjes <rientjes@google.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/vblank: update recently added vbl interface to be more future proof.
  drm radeon: Return -EINVAL on wrong pm sysfs access
  drm/radeon/kms: fix hardcoded EDID handling
  Revert "drm/i915: Don't save/restore hardware status page address register"
  drm/i915: Avoid unmapping pages from a NULL address space
  drm/i915: Fix use after free within tracepoint
  drm/i915: Restore missing command flush before interrupt on BLT ring
  drm/i915: Disable pagefaults along execbuffer relocation fast path
  drm/i915: Fix computation of pitch for dumb bo creator
  drm/i915: report correct render clock frequencies on SNB
  drm/i915/dp: Correct the order of deletion for ghost eDP devices
  drm/i915: Fix tiling corruption from pipelined fencing
  drm/i915: Re-enable self-refresh
  drm/i915: Prevent racy removal of request from client list
  drm/i915: skip redundant operations whilst enabling pipes and planes
  drm/i915: Remove surplus POSTING_READs before wait_for_vblank
  drm/radeon/kms: prefer legacy pll algo for tv-out
  drm: check for modesetting on modeset ioctls
  drm/kernel: vblank wait on crtc > 1
  drm: Fix use-after-free in drm_gem_vm_close()

It turns out that the cmpxchg16b emulation has to access vmalloced
percpu memory with interrupts disabled. If the memory has never
been touched before then the fault necessary to establish the
mapping will not to occur and the kernel will fail on boot.

Fix that by reusing the CONFIG_PREEMPT code that writes the
cpu number into a field on every cpu. Writing to the per cpu
area before causes the mapping to be established before we get
to a cmpxchg16b emulation.
Tested-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NChristoph Lameter <cl@linux.com>
Signed-off-by: NPekka Enberg <penberg@kernel.org>

On Thu, 24 Mar 2011, Ingo Molnar wrote:
> RIP: 0010:[<ffffffff810570a9>]  [<ffffffff810570a9>] get_next_timer_interrupt+0x119/0x260

That's a typical timer crash, but you were unable to debug it with
debugobjects because commit d3f661d6 broke those.

Cc: Christoph Lameter <cl@linux.com>
Tested-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NPekka Enberg <penberg@kernel.org>

autofs4: Do not potentially dereference NULL pointer returned by fget() in autofs_dev_ioctl_setpipefd()

In fs/autofs4/dev-ioctl.c::autofs_dev_ioctl_setpipefd() we call fget(),
which may return NULL, but we do not explicitly test for that NULL return
so we may end up dereferencing a NULL pointer - bad.

When I originally submitted this patch I had chosen EBUSY as the return
value to use if this happens. Ian Kent was kind enough to explain why that
would most likely be wrong and why EBADF should most likely be used
instead. This version of the patch uses EBADF.
Signed-off-by: NJesper Juhl <jj@chaosbits.net>
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

The autofs4_lock introduced by the rcu-walk changes has unnecessarily
broad scope. The locking is better handled by the per-autofs super
block lookup_lock.
Signed-off-by: NIan Kent <raven@themaw.net>
Acked-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

The daemon never needs to block and, in the rcu-walk case an error
return isn't used, so always return zero.
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

The vfs-scale changes changed the traversal used in
autofs4_expire_indirect() from a list to a depth first tree traversal
which isn't right.
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

There is a missing dput() when returning from autofs4_expire_direct()
when we see that the dentry is already a pending mount.
Signed-off-by: NIan Kent <raven@themaw.net>
Acked-by: NDavid Howells <dhowells@redhat.com>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

When direct (and offset) mounts were introduced the the last used
timeout could no longer be updated in ->d_revalidate(). This is
because covered direct mounts would be followed over without calling
the autofs file system. As a result the definition of the busyness
check for all entries was changed to be "actually busy" being an open
file or working directory within the automount. But now we have a call
back in the follow so the last used update on any access can be
re-instated. This requires DCACHE_MANAGE_TRANSIT to always be set.
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

When following a mount in rcu-walk mode we must check if the incoming dentry
is telling us it may need to block, even if it isn't actually a mountpoint.
Signed-off-by: NIan Kent <raven@themaw.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

* 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block: (65 commits)
  Documentation/iostats.txt: bit-size reference etc.
  cfq-iosched: removing unnecessary think time checking
  cfq-iosched: Don't clear queue stats when preempt.
  blk-throttle: Reset group slice when limits are changed
  blk-cgroup: Only give unaccounted_time under debug
  cfq-iosched: Don't set active queue in preempt
  block: fix non-atomic access to genhd inflight structures
  block: attempt to merge with existing requests on plug flush
  block: NULL dereference on error path in __blkdev_get()
  cfq-iosched: Don't update group weights when on service tree
  fs: assign sb->s_bdi to default_backing_dev_info if the bdi is going away
  block: Require subsystems to explicitly allocate bio_set integrity mempool
  jbd2: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging
  jbd: finish conversion from WRITE_SYNC_PLUG to WRITE_SYNC and explicit plugging
  fs: make fsync_buffers_list() plug
  mm: make generic_writepages() use plugging
  blk-cgroup: Add unaccounted time to timeslice_used.
  block: fixup plugging stubs for !CONFIG_BLOCK
  block: remove obsolete comments for blkdev_issue_zeroout.
  blktrace: Use rq->cmd_flags directly in blk_add_trace_rq.
  ...

Fix up conflicts in fs/{aio.c,super.c}

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300:
  MN10300: gcc 4.6 vs am33 inline assembly
  MN10300: Deprecate gdbstub
  MN10300: Allow KGDB to use the MN10300 serial ports
  MN10300: Emulate single stepping in KGDB on MN10300
  MN10300: Generalise kernel debugger kernel halt, reboot or power off hook
  KGDB: Notify GDB of machine halt, reboot or power off
  MN10300: Use KGDB
  MN10300: Create generic kernel debugger hooks
  MN10300: Create general kernel debugger cache flushing
  MN10300: Introduce a general config option for kernel debugger hooks
  MN10300: The icache invalidate functions should disable the icache first
  MN10300: gdbstub: Restrict single-stepping to non-preemptable non-SMP configs

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  pstore: cleanups to pstore_dump()
  [IA64] New syscalls for 2.6.39

* 'rmobile-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
  mmc: Add MMC_PROGRESS_*
  mmc, ARM: Rename SuperH Mobile ARM zboot helpers
  ARM: mach-shmobile: add coherent DMA mask to CEU camera devices
  ARM: mach-shmobile: Dynamic backlight control for Mackerel

* 'sh-latest' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
  sh: Fix build alloc_thread_info_node function
  sh: Fix ptrace hw_breakpoint handling
  sh: Fix ptrace fpu state initialisation
  sh: Re-enable GENERIC_HARDIRQS_NO_DEPRECATED.
  sh: pmb: Use struct syscore_ops instead of sysdevs
  sh: Use struct syscore_ops instead of sysdevs
  sh: Conver to asm-generic/sizes.h.
  sh: wire up sys_syncfs.

* 'usb-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6:
  USB: cdc-acm: fix potential null-pointer dereference on disconnect
  USB: cdc-acm: fix potential null-pointer dereference
  USB: cdc-acm: fix memory corruption / panic
  USB: Fix 'bad dma' problem on WDM device disconnect
  usb: wwan: fix compilation without CONFIG_PM_RUNTIME
  USB: uss720 fixup refcount position
  usb: musb: blackfin: fix typo in new bfin_musb_vbus_status func
  usb: musb: blackfin: fix typo in new dev_pm_ops struct
  usb: musb: blackfin: fix typo in platform driver name
  usb: musb: Fix for merge issue
  ehci-hcd: Bug fix: don't set a QH's Halt bit
  USB: Do not pass negative length to snoop_urb()

* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (442 commits)
  [media] videobuf2-dma-contig: make cookie() return a pointer to dma_addr_t
  [media] sh_mobile_ceu_camera: Do not call vb2's mem_ops directly
  [media] V4L: soc-camera: explicitly require V4L2_BUF_TYPE_VIDEO_CAPTURE
  [media] v4l: soc-camera: Store negotiated buffer settings
  [media] rc: interim support for 32-bit NEC-ish scancodes
  [media] mceusb: topseed 0x0011 needs gen3 init for tx to work
  [media] lirc_zilog: error out if buffer read bytes != chunk size
  [media] lirc: silence some compile warnings
  [media] hdpvr: use same polling interval as other OS
  [media] ir-kbd-i2c: pass device code w/key in hauppauge case
  [media] rc/keymaps: Remove the obsolete rc-rc5-tv keymap
  [media] remove the old RC_MAP_HAUPPAUGE_NEW RC map
  [media] rc/keymaps: Rename Hauppauge table as rc-hauppauge
  [media] rc-rc5-hauppauge-new: Fix Hauppauge Grey mapping
  [media] rc-rc5-hauppauge-new: Add support for the old Black RC
  [media] rc-rc5-hauppauge-new: Add the old control to the table
  [media] rc-winfast: Fix the keycode tables
  [media] a800: Fix a few wrong IR key assignments
  [media] opera1: Use multimedia keys instead of an app-specific mapping
  [media] dw2102: Use multimedia keys instead of an app-specific mapping
  ...

Fix up trivial conflicts (remove/modify and some real conflicts) in:
	arch/arm/mach-omap2/devices.c
	drivers/staging/Kconfig
	drivers/staging/Makefile
	drivers/staging/dabusb/dabusb.c
	drivers/staging/dabusb/dabusb.h
	drivers/staging/easycap/easycap_ioctl.c
	drivers/staging/usbvideo/usbvideo.c
	drivers/staging/usbvideo/vicam.c

* 'for-linus' of git://android.git.kernel.org/kernel/tegra:
  ARM: tegra: harmony: initialize the TPS65862 PMIC
  ARM: tegra: update defconfig
  ARM: tegra: harmony: update PCI-e initialization sequence
  ARM: tegra: trimslice: enable MMC/SD slots
  ARM: tegra: enable new drivers in defconfig
  ARM: tegra: Add Toshiba AC100 support
  ARM: tegra: harmony: Set WM8903 gpio_base
  ARM: tegra: harmony: I2C-related portions of audio support
  ARM: tegra: harmony: register i2c devices
  ARM: tegra: seaboard: register i2c devices
  ARM: tegra: harmony: Beginnings of audio support
  ARM: tegra: create defines for SD-related GPIO names
  ARM: tegra: add devices.c entries for audio

* 'devicetree/merge' of git://git.secretlab.ca/git/linux-2.6:
  spi/pl022: Add loopback support for the SPI on 5500
  spi/omap_mcspi: Fix broken last word xfer
  of/flattree: minor cleanups
  dt: eliminate OF_NO_DEEP_PROBE and test for NULL match table
  dt: protect against NULL matches passed to of_match_node()
  dt: Refactor of_platform_bus_probe()

This is my second attempt to make this enum generally available.
The first attempt added MMCIF_PROGRESS_* to include/linux/mmc/sh_mmcif.h.
However this is not sufficiently generic as the enum will be
used by SDHI boot code.
Signed-off-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

These headers and helpers will also be used for SDHI boot
so the mmcif name will start to make a lot less sense.
Signed-off-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

* 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6:
  intel_idle: Rename cpuidle states

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (42 commits)
  ACPI: minor printk format change in acpi_pad
  ACPI: make acpi_pad /sys output more readable
  ACPICA: Update version to 20110316
  ACPICA: Header support for SLIC table
  ACPI: Make sure the FADT is at least rev 2 before using the reset register
  ACPI: Bug compatibility for Windows on the ACPI reboot vector
  ACPICA: Fix access width for reset vector
  ACPI battery: fribble sysfs files from a resume notifier
  ACPI button: remove unused procfs I/F
  ACPI, APEI, Add PCIe AER error information printing support
  PCIe, AER, use pre-generated prefix in error information printing
  ACPI, APEI, Add ERST record ID cache
  ACPI: Use syscore_ops instead of sysdev class and sysdev
  ACPI: Remove the unused EC sysdev class
  ACPI: use __cpuinit for the acpi_processor_set_pdc() call tree
  ACPI: use __init where possible in processor driver
  Thermal_Framework-Fix_crash_during_hwmon_unregister
  ACPICA: Update version to 20110211.
  ACPICA: Add mechanism to defer _REG methods for some installed handlers
  ACPICA: Add support for FunctionalFixedHW in acpi_ut_get_region_name
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin:
  Blackfin: bf54x: re-enable anomaly 05000353 for all revs
  Blackfin: enable atomic64_t support
  Blackfin: wire up new syncfs syscall
  Blackfin: SMP: flush CoreB cache when shutting down

* 'for-linus' of git://git.infradead.org/ubi-2.6:
  UBIFS: fix assertion warning and refine comments
  UBIFS: kill CONFIG_UBIFS_FS_DEBUG_CHKS
  UBIFS: use GFP_NOFS properly
  UBI: use GFP_NOFS properly

* 'for-2.6.39' of git://linux-nfs.org/~bfields/linux:
  SUNRPC: Remove resource leak in svc_rdma_send_error()
  nfsd: wrong index used in inner loop
  nfsd4: fix comment and remove unused nfsd4_file fields
  nfs41: make sure nfs server return right ca_maxresponsesize_cached
  nfsd: fix compile error
  svcrpc: fix bad argument in unix_domain_find
  nfsd4: fix struct file leak
  nfsd4: minor nfs4state.c reshuffling
  svcrpc: fix rare race on unix_domain creation
  nfsd41: modify the members value of nfsd4_op_flags
  nfsd: add proc file listing kernel's gss_krb5 enctypes
  gss:krb5 only include enctype numbers in gm_upcall_enctypes
  NFSD, VFS: Remove dead code in nfsd_rename()
  nfsd: kill unused macro definition
  locks: use assign_type()

* git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus:
  Squashfs: Use vmalloc rather than kmalloc for zlib workspace
  Squashfs: handle corruption of directory structure
  Squashfs: wrap squashfs_mount() definition
  Squashfs: xz_wrapper doesn't need to include squashfs_fs_i.h anymore
  Squashfs: Update documentation to include compression options
  Squashfs: Update Kconfig help text to include xz compression
  Squashfs: add compression options support to xz decompressor
  Squashfs: extend decompressor framework to handle compression options