cmpxchg64() today generates, to quote Linus, "barf bag" code.

cmpxchg64() is about to get used in the scheduler to fix a bug there,
but it's a prerequisite that cmpxchg64() first be made non-sucking.

This patch turns cmpxchg64() into an efficient implementation that
uses the alternative() mechanism to just use the raw instruction on
all modern systems.

Note: the fallback is NOT smp safe, just like the current fallback
is not SMP safe. (Interested parties with i486 based SMP systems
are welcome to submit fix patches for that.)
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
[ fixed asm constraint bug ]
Fixed-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090930170754.0886ff2e@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

.. duplicated by merging the same fix twice, for details see commit
0d9df251 ("Merge
git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The following commit made console open fails while booting:

	commit b50989dc
	Author: Alan Cox <alan@linux.intel.com>
	Date:   Sat Sep 19 13:13:22 2009 -0700

	tty: make the kref destructor occur asynchronously

Due to tty release routines run in a workqueue now, error like the
following will be reported while booting:

INIT open /dev/console Input/output error

It also causes hibernation regression to appear as reported at
http://bugzilla.kernel.org/show_bug.cgi?id=14229

The reason is that now there's latency issue with closing, but when
we open a "closing not finished" tty, -EIO will be returned.

Fix it as per the following Alan's suggestion:

  Fun but it's actually not a bug and the fix is wrong in itself as
  the port may be closing but not yet being destructed, in which case
  it seems to do the wrong thing.  Opening a tty that is closing (and
  could be closing for long periods) is supposed to return -EIO.

  I suspect a better way to deal with this and keep the old console
  timing is to split tty->shutdown into two functions.

  tty->shutdown() - called synchronously just before we dump the tty
  onto the waitqueue for destruction

  tty->cleanup() - called when the destructor runs.

  We would then do the shutdown part which can occur in IRQ context
  fine, before queueing the rest of the release (from tty->magic = 0
  ...  the end) to occur asynchronously

  The USB update in -next would then need a call like

       if (tty->cleanup)
               tty->cleanup(tty);

  at the top of the async function and the USB shutdown to be split
  between shutdown and cleanup as the USB resource cleanup and final
  tidy cannot occur synchronously as it needs to sleep.

  In other words the logic becomes

       final kref put
               make object unfindable

       async
               clean it up
Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
[ rjw: Rebased on top of 2.6.31-git, reworked the changelog. ]
Signed-off-by: "Rafael J. Wysocki" <rjw@sisk.pl>
[ Changed serial naming to match new rules, dropped tty_shutdown as per
  comments from Alan Stern  - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 3d5b6fb4 ("ACPI: Kill overly
verbose "power state" log messages") removed the actual use of this
variable, but didn't remove the variable itself, resulting in build
warnings like

  drivers/acpi/processor_idle.c: In function ‘acpi_processor_power_init’:
  drivers/acpi/processor_idle.c:1169: warning: unused variable ‘i’

Just get rid of the now unused variable.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* mark struct vm_area_struct::vm_ops as const
* mark vm_ops in AGP code

But leave TTM code alone, something is fishy there with global vm_ops
being used.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  hrtimer: Eliminate needless reprogramming of clock events device

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6:
  ACPI: IA64=y ACPI=n build fix
  ACPI: Kill overly verbose "power state" log messages
  ACPI: fix Compaq Evo N800c (Pentium 4m) boot hang regression
  ACPI: Clarify resource conflict message
  thinkpad-acpi: fix CONFIG_THINKPAD_ACPI_HOTKEY_POLL build problem

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Fix hwpoison code related build failure on 32-bit NUMAQ

ia64's sim_defconfig uses CONFIG_ACPI=n
which now #define's acpi_disabled in <linux/acpi.h>

So we shouldn't re-define it here in <asm/acpi.h>
Signed-off-by: Len Brown <len.brown@intel.com>

I was recently lucky enough to get a 64-CPU system, so my kernel log
ends up with 64 lines like:

    ACPI: CPU0 (power states: C1[C1] C2[C3])

This is pretty useless clutter because this info is already available
after boot from both /sys/devices/system/cpu/cpu*/cpuidle/state?/ as
well as /proc/acpi/processor/CPU*/power.

So just delete the code that prints the C-states in processor_idle.c.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Len Brown <len.brown@intel.com>

This build failure triggers:

 In file included from include/linux/suspend.h:8,
                 from arch/x86/kernel/asm-offsets_32.c:11,
                 from arch/x86/kernel/asm-offsets.c:2:
 include/linux/mm.h:503:2: error: #error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS

Because due to the hwpoison page flag we ran out of page
flags on 32-bit.

Dont turn on hwpoison on 32-bit NUMA (it's rare in any
case).

Also clean up the Kconfig dependencies in the generic MM
code by introducing ARCH_SUPPORTS_MEMORY_FAILURE.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

Don't disable ARB_DISABLE when the familary ID is 0x0F.

http://bugzilla.kernel.org/show_bug.cgi?id=14211

This was a 2.6.31 regression, and so this patch
needs to be applied to 2.6.31.stable
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

The message "ACPI: Device needs an ACPI driver" is misleading. The
device _may_ need an ACPI driver, if the BIOS implemented a custom
API for the device in question (which, AFAIK, can't be checked.) If
not, then either a generic ACPI driver may be used (for example
"thermal"), or nothing can be done (other than a white list).

I propose to reword the message to:

ACPI: If an ACPI driver is available for this device, you should use
it instead of the native driver

which I think is more correct. Comments and suggestions welcome.

I also added a message warning about possible problems and system
instability when users pass acpi_enforce_resources=lax, as suggested
by Len.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Alan Jenkins <sourcejedi.lkml@googlemail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

Fix this problem when CONFIG_THINKPAD_ACPI_HOTKEY_POLL is undefined:

  CHECK   drivers/platform/x86/thinkpad_acpi.c
drivers/platform/x86/thinkpad_acpi.c:1968:21: error: not an lvalue
  CC [M]  drivers/platform/x86/thinkpad_acpi.o
drivers/platform/x86/thinkpad_acpi.c: In function 'tpacpi_hotkey_driver_mask_set':
drivers/platform/x86/thinkpad_acpi.c:1968: error: lvalue required as left operand of assignment
Reported-by: Noah Dain <noahdain@gmail.com>
Reported-by: Audrius Kazukauskas <audrius@neutrino.lt>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6:
  [IA64] implement ticket locks for Itanium

* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes:
  alpha: fix build after vmlinux.lds.S cleanup
  mips: fix build of vmlinux.lds

* 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds:
  leds: move leds-clevo-mail's probe function to .devinit.text
  leds: Fix indentation in LEDS_LP3944 Kconfig entry
  leds: Fix LED names 
  leds: Fix leds-pca9532 whitespace issues
  leds: fix coding style in worker thread code for ledtrig-gpio.
  leds: gpio-leds: fix typographics fault
  leds: Add WM831x status LED driver

* 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight:
  backlight: new driver for ADP5520/ADP5501 MFD PMICs
  backlight: extend event support to also support poll()
  backlight/eeepc-laptop: Update the backlight state when we change brightness
  backlight/acpi: Update the backlight state when we change brightness
  backlight: Allow drivers to update the core, and generate events on changes
  backlight: switch to da903x driver to dev_pm_ops
  backlight: Add support for the Avionic Design Xanthos backlight device.
  backlight: spi driver for LMS283GF05 LCD
  backlight: move hp680-bl's probe function to .devinit.text
  backlight: Add support for new Apple machines.
  backlight: mbp_nvidia_bl: add support for MacBookAir 1,1
  backlight: Add WM831x backlight driver

Trivial conflicts due to '#ifdef CONFIG_PM' differences in
drivers/video/backlight/da903x_bl.c

* remove asm/atomic.h inclusion from kref.h -- not needed, linux/types.h
  is enough for atomic_t
* remove linux/kref.h inclusion from files which do not need it.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  futex: Add memory barrier commentary to futex_wait_queue_me()
  futex: Fix wakeup race by setting TASK_INTERRUPTIBLE before queue_me()
  futex: Correct futex_q woken state commentary
  futex: Make function kernel-doc commentary consistent
  futex: Correct queue_me and unqueue_me commentary
  futex: Correct futex_wait_requeue_pi() commentary

Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  perf tools: Dont use openat()
  perf tools: Fix buffer allocation
  perf tools: .gitignore += perf*.html
  perf tools: Handle relative paths while loading module symbols
  perf tools: Fix module symbol loading bug
  perf_event, x86: Fix 'perf sched record' crashing the machine
  perf_event: Update PERF_EVENT_FORK header definition
  perf stat: Fix zero total printouts

Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  clocksource: Resume clocksource without taking the clocksource mutex

Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  modules, tracing: Remove stale struct marker signature from module_layout()
  tracing/workqueue: Use %pf in workqueue trace events
  tracing: Fix a comment and a trivial format issue in tracepoint.h
  tracing: Fix failure path in ftrace_regex_open()
  tracing: Fix failure path in ftrace_graph_write()
  tracing: Check the return value of trace_get_user()
  tracing: Fix off-by-one in trace_get_user()

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Remove redundant non-NUMA topology functions
  x86: early_printk: Protect against using the same device twice
  x86: Reduce verbosity of "PAT enabled" kernel message
  x86: Reduce verbosity of "TSC is reliable" message
  x86: mce: Use safer ways to access MCE registers
  x86: mce, inject: Use real inject-msg in raise_local
  x86: mce: Fix thermal throttling message storm
  x86: mce: Clean up thermal throttling state tracking code
  x86: split NX setup into separate file to limit unstack-protected code
  xen: check EFER for NX before setting up GDT mapping
  x86: Cleanup linker script using new linker script macros.
  x86: Use section .data.page_aligned for the idt_table.
  x86: convert to use __HEAD and HEAD_TEXT macros.
  x86: convert compressed loader to use __HEAD and HEAD_TEXT macros.
  x86: fix fragile computation of vsyscall address

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: (32 commits)
  ACPI: i2c-scmi: don't use acpi_device_uid()
  ACPI: simplify building device HID/CID list
  ACPI: remove acpi_device_uid() and related stuff
  ACPI: remove acpi_device.flags.hardware_id
  ACPI: remove acpi_device.flags.compatible_ids
  ACPI: maintain a single list of _HID and _CID IDs
  ACPI: make sure every acpi_device has an ID
  ACPI: use acpi_device_hid() when possible
  ACPI: fix synthetic HID for \_SB_
  ACPI: handle re-enumeration, when acpi_devices might already exist
  ACPI: factor out device type and status checking
  ACPI: add acpi_bus_get_status_handle()
  ACPI: use acpi_walk_namespace() to enumerate devices
  ACPI: identify device tree root by null parent pointer, not ACPI_BUS_TYPE
  ACPI: enumerate namespace before adding functional fixed hardware devices
  ACPI: convert acpi_bus_scan() to operate on an acpi_handle
  ACPI: add acpi_bus_get_parent() and remove "parent" arguments
  ACPI: remove unnecessary argument checking
  ACPI: remove redundant "type" arguments
  ACPI: remove acpi_device_set_context() "type" argument
  ...

* 'writeback' of git://git.kernel.dk/linux-2.6-block:
  writeback: pass in super_block to bdi_start_writeback()

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  cifs: fix locking and list handling code in cifs_open and its helper
  [CIFS] Remove build warning
  cifs: fix problems with last two commits
  [CIFS] Fix build break when keys support turned off
  cifs: eliminate cifs_init_private
  cifs: convert oplock breaks to use slow_work facility (try #4)
  cifs: have cifsFileInfo hold an extra inode reference
  cifs: take read lock on GlobalSMBSes_lock in is_valid_oplock_break
  cifs: remove cifsInodeInfo.oplockPending flag
  cifs: fix oplock request handling in posix codepath
  [CIFS] Re-enable Lanman security

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
  at91_can: Forgotten git 'add' of at91_can.c
  TI Davinci EMAC: Fix in vector definition for EMAC_VERSION_2
  ax25: Fix ax25_cb refcounting in ax25_ctl_ioctl
  virtio_net: Check for room in the vq before adding buffer
  virtio_net: avoid (most) NETDEV_TX_BUSY by stopping queue early.
  virtio_net: formalize skb_vnet_hdr
  virtio_net: don't free buffers in xmit ring
  virtio_net: return NETDEV_TX_BUSY instead of queueing an extra skb.
  virtio_net: skb_orphan() and nf_reset() in xmit path.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc64: vio: Kill BUILD_BUG_ON() in vio_dring_avail().

Trivial conflict in arch/sparc/include/asm/vio.h due to David removing
the whole messy BUG_ON that was confused.

Commit 200b812d "Clear the exclusive monitor when returning from an
exception" broke the vast majority of ARM systems in the wild which are
still pre ARMv6.  The kernel is crashing on the first occurrence of an
exception due to the removal of the actual return instruction for them.
Let's add it back.
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

Extend the backlight event support to also allow the use of
poll()/select() on actual_brightness.

We already have the entire event hookup anyway, adding a single
function call in one line to get functionality like that is a really
good deal.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

We recently removed the acpi_device_uid() interface because nobody
used it.  I don't think it's essential here either.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

Sometimes we only want to write pages from a specific super_block,
so allow that to be passed in.

This fixes a problem with commit 56a131dc
causing writeback on all super_blocks on a bdi, where we only really
want to sync a specific sb from writeback_inodes_sb().
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

Signed-off-by: David S. Miller <davem@davemloft.net>

In the emac_poll function when looking for interrupt status masks
correct definition must be chosen based on EMAC_VERSION(the bit
mask has changed from version 1 to version 2).
Signed-off-by: Sriram <srk@ti.com>
Acked-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use ax25_cb_put after ax25_find_cb in ax25_ctl_ioctl.
Reported-by: Bernard Pidoux F6BVP <f6bvp@free.fr>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Reviewed-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>