Based upon an email by Joe Perches.
Reported-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>

Catch cases where dst_metric_set() and other functions are called
but _metrics is NULL.
Signed-off-by: NStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A non-zero, non-descript value is needed as the hash key. The hash variable was left un-initialized; but sometimes it gets a zero value
and hashing is not effective. The constant value used now (not of any significance) seems to work fine.
Signed-off-by: NSathya Perla <sathya.perla@emulex.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

bridge netfilter code uses a fake_rtable, and we must init its _metric
field or risk NULL dereference later.

Ref: https://bugzilla.kernel.org/show_bug.cgi?id=35672Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

dst_default_metrics is readonly, we dont want to kfree() it later.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Changes:
- claim slave/data interface during bind() and release
 interfaces in unbind() unconditionally
- in case of error during bind(), release claimed data
 interface in the same function
- remove obsolited "*_claimed" entries from driver context
Signed-off-by: NAlexey Orishko <alexey.orishko@stericsson.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: NEilon Greenstein <eilong@broadcom.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In igmp_group_dropped() we call ip_mc_clear_src(), which resets the number
of source filters per mulitcast. However, igmp_group_dropped() is also
called on NETDEV_DOWN, NETDEV_PRE_TYPE_CHANGE and NETDEV_UNREGISTER, which
means that the group might get added back on NETDEV_UP, NETDEV_REGISTER and
NETDEV_POST_TYPE_CHANGE respectively, leaving us with broken source
filters.

To fix that, we must clear the source filters only when there are no users
in the ip_mc_list, i.e. in ip_mc_dec_group() and on device destroy.
Acked-by: NDavid L Stevens <dlstevens@us.ibm.com>
Signed-off-by: NVeaceslav Falico <vfalico@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

synchronize_rcu() is very slow in various situations (HZ=100,
CONFIG_NO_HZ=y, CONFIG_PREEMPT=n)

Extract from my (mostly idle) 8 core machine :

 synchronize_rcu() in 99985 us
 synchronize_rcu() in 79982 us
 synchronize_rcu() in 87612 us
 synchronize_rcu() in 79827 us
 synchronize_rcu() in 109860 us
 synchronize_rcu() in 98039 us
 synchronize_rcu() in 89841 us
 synchronize_rcu() in 79842 us
 synchronize_rcu() in 80151 us
 synchronize_rcu() in 119833 us
 synchronize_rcu() in 99858 us
 synchronize_rcu() in 73999 us
 synchronize_rcu() in 79855 us
 synchronize_rcu() in 79853 us

When we hold RTNL mutex, we would like to spend some cpu cycles but not
block too long other processes waiting for this mutex.

We also want to setup/dismantle network features as fast as possible at
boot/shutdown time.

This patch makes synchronize_net() call the expedited version if RTNL is
locked.

synchronize_rcu_expedited() typical delay is about 20 us on my machine.

 synchronize_rcu_expedited() in 18 us
 synchronize_rcu_expedited() in 18 us
 synchronize_rcu_expedited() in 18 us
 synchronize_rcu_expedited() in 18 us
 synchronize_rcu_expedited() in 20 us
 synchronize_rcu_expedited() in 16 us
 synchronize_rcu_expedited() in 20 us
 synchronize_rcu_expedited() in 18 us
 synchronize_rcu_expedited() in 18 us
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
CC: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
CC: Ben Greear <greearb@candelatech.com>
Reviewed-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The %pK format specifier is designed to hide exposed kernel pointers,
specifically via /proc interfaces.  Exposing these pointers provides an
easy target for kernel write vulnerabilities, since they reveal the
locations of writable structures containing easily triggerable function
pointers.  The behavior of %pK depends on the kptr_restrict sysctl.

If kptr_restrict is set to 0, no deviation from the standard %p behavior
occurs.  If kptr_restrict is set to 1, the default, if the current user
(intended to be a reader via seq_printf(), etc.) does not have CAP_SYSLOG
(currently in the LSM tree), kernel pointers using %pK are printed as 0's.
 If kptr_restrict is set to 2, kernel pointers using %pK are printed as
0's regardless of privileges.  Replacing with 0's was chosen over the
default "(null)", which cannot be parsed by userland %p, which expects
"(nil)".

The supporting code for kptr_restrict and %pK are currently in the -mm
tree.  This patch converts users of %p in net/ to %pK.  Cases of printing
pointers to the syslog are not covered, since this would eliminate useful
information for postmortem debugging and the reading of the syslog is
already optionally protected by the dmesg_restrict sysctl.
Signed-off-by: NDan Rosenberg <drosenberg@vsecurity.com>
Cc: James Morris <jmorris@namei.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Thomas Graf <tgraf@infradead.org>
Cc: Eugene Teo <eugeneteo@kernel.org>
Cc: Kees Cook <kees.cook@canonical.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David S. Miller <davem@davemloft.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Eric Paris <eparis@parisplace.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

No need to duplicate these defines now that the common Blackfin code has
unified these for all UART devices.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
Cc: Samuel Ortiz <samuel@sortiz.org>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Like ipv4, just return xfrm6_rcv_spi()'s return value directly.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A mis-configured filter can spam the logs with lots of stack traces.

Rate-limit the warnings and add printout of the bogus filter information.
Original-patch-by: NBen Greear <greearb@candelatech.com>
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add a generic mechanism to ratelimit WARN(foo, fmt, ...) messages
using a hidden per call site static struct ratelimit_state.

Also add an __WARN_RATELIMIT variant to be able to use a specific
struct ratelimit_state.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

While chasing a possible net_sched bug, I found that IP fragments have
litle chance to pass a congestioned SFQ qdisc :

- Say SFQ qdisc is full because one flow is non responsive.
- ip_fragment() wants to send two fragments belonging to an idle flow.
- sfq_enqueue() queues first packet, but see queue limit reached :
- sfq_enqueue() drops one packet from 'big consumer', and returns
NET_XMIT_CN.
- ip_fragment() cancel remaining fragments.

This patch restores fairness, making sure we return NET_XMIT_CN only if
we dropped a packet from the same flow.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
CC: Jarek Poplawski <jarkao2@gmail.com>
CC: Jamal Hadi Salim <hadi@cyberus.ca>
CC: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Ehea will not register multicast groups in phyp if the physical
interface is in promiscuous mode. But it should register if the
logical port is in promiscuous mode, but the physical port is not.

Ehea physical promiscuous mode is defined by ehea_port->promisc,
while logical port is defined by IFF_PROMISC.

So currently, if the user set the interface in promiscuous mode,
IGMP will not be registred in PHYP, and PHYP will never pass
the multicast packet to the logical port, which is bad

So, this patch just fixes it, assuring that we register in phyp
if the physical port is not on promiscuous mode.
Signed-off-by: NBreno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

No need to wait for a rcu grace period after list insertion.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/ping.c: In function ‘ping_v4_unhash’:
net/ipv4/ping.c:140:28: warning: variable ‘hslot’ set but not used
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
CC: Vasiliy Kulikov <segoon@openwall.com>
Acked-by: NVasiliy Kulikov <segoon@openwall.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  slub: Deal with hyperthetical case of PAGE_SIZE > 2M
  slub: Remove node check in slab_free
  slub: avoid label inside conditional
  slub: Make CONFIG_DEBUG_PAGE_ALLOC work with new fastpath
  slub: Avoid warning for !CONFIG_SLUB_DEBUG
  slub: Remove CONFIG_CMPXCHG_LOCAL ifdeffery
  slub: Move debug handlign in __slab_free
  slub: Move node determination out of hotpath
  slub: Eliminate repeated use of c->page through a new page variable
  slub: get_map() function to establish map of free objects in a slab
  slub: Use NUMA_NO_NODE in get_partial
  slub: Fix a typo in config name

Conflicts:
	mm/slub.c

* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging:
  hwmon: (coretemp) Fix checkpatch errors
  hwmon: Remove pkgtemp driver
  hwmon: (coretemp) Merge pkgtemp with coretemp
  hwmon: (pmbus) Add support for Analog Devices ADM1275
  hwmon: (pmbus) Support for TI UCD90xxx series Sequencer and System Health Controllers
  hwmon: (pmbus) Add support for TI UCD9200 series of PWM System Controllers
  hwmon: (pmbus) Use device specific function to read fan configuration
  hwmon: (pmbus) Expand scope of device specific get_status function
  hwmon: (pmbus) Introduce infrastructure to detect sensors and limit registers
  hwmon: Driver for MAX16065 System Manager and compatibles
  hwmon: (sht15) add support for CRC validation
  hwmon: (sht15) add support for the status register
  hwmon: (sht15) clean-up the probe function
  hwmon: (sht15) general code clean-up
  hwmon: Add support for MAX6642

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

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  perf tools: Fix sample size bit operations
  perf tools: Fix ommitted mmap data update on remap
  watchdog: Change the default timeout and configure nmi watchdog period based on watchdog_thresh
  watchdog: Disable watchdog when thresh is zero
  watchdog: Only disable/enable watchdog if neccessary
  watchdog: Fix rounding bug in get_sample_period()
  perf tools: Propagate event parse error handling
  perf tools: Robustify dynamic sample content fetch
  perf tools: Pre-check sample size before parsing
  perf tools: Move evlist sample helpers to evlist area
  perf tools: Remove junk code in mmap size handling
  perf tools: Check we are able to read the event size on mmap

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (39 commits)
  b43: fix comment typo reqest -> request
  Haavard Skinnemoen has left Atmel
  cris: typo in mach-fs Makefile
  Kconfig: fix copy/paste-ism for dell-wmi-aio driver
  doc: timers-howto: fix a typo ("unsgined")
  perf: Only include annotate.h once in tools/perf/util/ui/browsers/annotate.c
  md, raid5: Fix spelling error in comment ('Ofcourse' --> 'Of course').
  treewide: fix a few typos in comments
  regulator: change debug statement be consistent with the style of the rest
  Revert "arm: mach-u300/gpio: Fix mem_region resource size miscalculations"
  audit: acquire creds selectively to reduce atomic op overhead
  rtlwifi: don't touch with treewide double semicolon removal
  treewide: cleanup continuations and remove logging message whitespace
  ath9k_hw: don't touch with treewide double semicolon removal
  include/linux/leds-regulator.h: fix syntax in example code
  tty: fix typo in descripton of tty_termios_encode_baud_rate
  xtensa: remove obsolete BKL kernel option from defconfig
  m68k: fix comment typo 'occcured'
  arch:Kconfig.locks Remove unused config option.
  treewide: remove extra semicolons
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid: (36 commits)
  HID: hid-multitouch: cosmetic changes, sort classes and devices
  HID: hid-multitouch: class MT_CLS_STANTUM is redundant with MT_CLS_CONFIDENCE
  HID: hid-multitouch: add support for Unitec panels
  HID: hid-multitouch: add support for Touch International panels
  HID: hid-multitouch: add support for GoodTouch panels
  HID: hid-multitouch: add support for CVTouch panels
  HID: hid-multitouch: add support for ActionStar panels
  HID: hiddev: fix race between hiddev_disconnect and hiddev_release
  HID: magicmouse: ignore 'ivalid report id' while switching modes
  HID: fix a crash in hid_report_raw_event() function.
  HID: hid-multitouch: add support for Elo TouchSystems 2515 IntelliTouch Plus
  HID: assorted usage updates from hut 1.12
  HID: roccat: fix actual/startup profile sysfs attribute in koneplus
  HID: hid-multitouch: Add support for Lumio panels
  HID: 'name' and 'phys' in 'struct hid_device' can never be NULL
  HID: hid-multitouch: add support for Ilitek dual-touch panel
  HID: picolcd: Avoid compile warning/error triggered by copy_from_user()
  HID: add support for Logitech G27 wheel
  HID: hiddev: fix error path in hiddev_read when interrupted
  HID: add support for Sony Navigation Controller
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/apm:
  apm-emulation: apm_mutex breaks ACK; remove it
  APM: take over maintainership

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6: (346 commits)
  ASoC: core: Don't set "(null)" as a driver name
  ALSA: hda - Use LPIB for ATI/AMD chipsets as default
  Revert "ALSA: hda - Use position_fix=3 as default for AMD chipsets"
  ASoC: Tegra: Fix compile when debugfs not enabled
  ASoC: spdif-dit: Add missing MODULE_*
  SOUND: OSS: Remove Au1550 driver.
  ALSA: hda - add Intel Panther Point HDMI codec id
  ALSA: emu10k1 - Add dB range to Bass and Treble for SB Live!
  ALSA: hda - Remove PCM mixer elements from Virtual Master of realtek
  ALSA: hda - Fix input-src parse in patch_analog.c
  ASoC: davinci-mcasp: enable ping-pong SRAM buffers
  ASoC: add iPAQ hx4700 machine driver
  ASoC: Asahi Kasei AK4641 codec driver
  ALSA: hda - Enable Realtek ALC269 codec input layer beep
  ALSA: intel8x0m: enable AMD8111 modem
  ALSA: HDA: Add jack detection for HDMI
  ALSA: sound, core, pcm_lib: fix xrun_log
  ASoC: Max98095: Move existing NULL check before pointer dereference.
  ALSA: sound, core, pcm_lib: xrun_log: log also in_interrupt
  ALSA: usb-audio - Add support for USB X-Fi S51 Pro
  ...

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

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86: Eliminate various 'set but not used' warnings
  x86, SMEP: Fix section mismatch warnings
  x86, amd: Use _safe() msr access for GartTlbWlk disable code

02e35228 (block: rescan partitions on invalidated devices on
-ENOMEDIA too) relocated partition rescan above explicit bd_set_size()
to simplify condition check.  As rescan_partitions() does its own bdev
size setting, this doesn't break anything; however,
rescan_partitions() prints out the following messages when adjusting
bdev size, which can be confusing.

  sda: detected capacity change from 0 to 146815737856
  sdb: detected capacity change from 0 to 146815737856

This patch restores the original order and remove the warning
messages.

stable: Please apply together with 02e35228 (block: rescan
        partitions on invalidated devices on -ENOMEDIA too).
Signed-off-by: NTejun Heo <tj@kernel.org>
Reported-by: NTony Luck <tony.luck@gmail.com>
Tested-by: NTony Luck <tony.luck@gmail.com>
Cc: stable@kernel.org
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

* 'kvm-updates/2.6.40' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (131 commits)
  KVM: MMU: Use ptep_user for cmpxchg_gpte()
  KVM: Fix kvm mmu_notifier initialization order
  KVM: Add documentation for KVM_CAP_NR_VCPUS
  KVM: make guest mode entry to be rcu quiescent state
  KVM: x86 emulator: Make jmp far emulation into a separate function
  KVM: x86 emulator: Rename emulate_grpX() to em_grpX()
  KVM: x86 emulator: Remove unused arg from emulate_pop()
  KVM: x86 emulator: Remove unused arg from writeback()
  KVM: x86 emulator: Remove unused arg from read_descriptor()
  KVM: x86 emulator: Remove unused arg from seg_override()
  KVM: Validate userspace_addr of memslot when registered
  KVM: MMU: Clean up gpte reading with copy_from_user()
  KVM: PPC: booke: add sregs support
  KVM: PPC: booke: save/restore VRSAVE (a.k.a. USPRG0)
  KVM: PPC: use ticks, not usecs, for exit timing
  KVM: PPC: fix exit accounting for SPRs, tlbwe, tlbsx
  KVM: PPC: e500: emulate SVR
  KVM: VMX: Cache vmcs segment fields
  KVM: x86 emulator: consolidate segment accessors
  KVM: VMX: Avoid reading %rip unnecessarily when handling exceptions
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (27 commits)
  bnx2x: allow device properly initialize after hotplug
  bnx2x: fix DMAE timeout according to hw specifications
  bnx2x: properly handle CFC DEL in cnic flow
  bnx2x: call dev_kfree_skb_any instead of dev_kfree_skb
  net: filter: move forward declarations to avoid compile warnings
  pktgen: refactor pg_init() code
  pktgen: use vzalloc_node() instead of vmalloc_node() + memset()
  net: skb_trim explicitely check the linearity instead of data_len
  ipv4: Give backtrace in ip_rt_bug().
  net: avoid synchronize_rcu() in dev_deactivate_many
  net: remove synchronize_net() from netdev_set_master()
  rtnetlink: ignore NETDEV_RELEASE and NETDEV_JOIN event
  net: rename NETDEV_BONDING_DESLAVE to NETDEV_RELEASE
  bridge: call NETDEV_JOIN notifiers when add a slave
  netpoll: disable netpoll when enslave a device
  macvlan: Forward unicast frames in bridge mode to lowerdev
  net: Remove linux/prefetch.h include from linux/skbuff.h
  ipv4: Include linux/prefetch.h in fib_trie.c
  netlabel: Remove prefetches from list handlers.
  drivers/net: add prefetch header for prefetch users
  ...

Fixed up prefetch parts: removed a few duplicate prefetch.h includes,
fixed the location of the igb prefetch.h, took my version of the
skbuff.h code without the extra parentheses etc.

* 'exec_rm_compat' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc:
  exec: document acct_arg_size()
  exec: unify do_execve/compat_do_execve code
  exec: introduce struct user_arg_ptr
  exec: introduce get_user_arg_ptr() helper

* git://git.kernel.org/pub/scm/linux/kernel/git/steve/gfs2-2.6-fixes:
  GFS2: Wait properly when flushing the ail list
  GFS2: Wipe directory hash table metadata when deallocating a directory

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-ktest:
  ktest: Allow options to be used by other options
  ktest: Create variables for the ktest config files
  ktest: Reboot after each patchcheck run
  ktest: Reboot to good kernel after every bisect run
  ktest: If test failed due to timeout, print that
  ktest: Fix post install command

What we want is to count the number of bits in the mask,
not some other random operation written in the middle
of the night.
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1306148788-6179-2-git-send-email-fweisbec@gmail.com
[ Fixed perf_event__names[] alignment which was nearby and hurting my eyes ... ]
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Commit eac9eace "perf tools: Check we are able to read the event
size on mmap" brought a check to ensure we can read the size of the
event before dereferencing it, and do a remap otherwise to move the
buffer forward.

However that remap was ommitting all the necessary work to
update the new page offset, head, and to unmap previous pages,
etc...

To fix this, gather all the code that fetches the event in a
seperate helper which does all the necessary checks about the
header/event size and tells us anytime a remap is needed.
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1306148788-6179-3-git-send-email-fweisbec@gmail.comSigned-off-by: NIngo Molnar <mingo@elte.hu>

apm_mutex is locked by a process (e.g. apm -s) at the start of apm_ioctl() and
remains locked while pm_suspend() is called. Any subsequent process trying to
ACK the suspend (e.g. apmd) is then blocked at the start of apm_ioctl(),
causing the suspend to be delayed for 5 seconds in apm_suspend_notifier()
while the ACK times out. In short, ACKs don't work.

The driver's data structures are sufficiently protected by assorted locks. And
pm_suspend() has its own mutex to prevent reentrancy. Consequently there is no
obvious requirement for apm_mutex, which evolved from earlier BKL calls. So
let's remove it.
Signed-off-by: NPaul Parsons <lost.distance@yahoo.com>
Acked-by: NRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

Before the conversion of the NMI watchdog to perf event, the
watchdog timeout was 5 seconds. Now it is 60 seconds. For my
particular application, netbooks, 5 seconds was a better
timeout. With a short timeout, we catch faults earlier and are
able to send back a panic. With a 60 second timeout, the user is
unlikely to wait and will instead hit the power button, causing
us to lose the panic info.

This change configures the NMI period to watchdog_thresh and
sets the softlockup_thresh to watchdog_thresh * 2. In addition,
watchdog_thresh was reduced to 10 seconds as suggested by Ingo
Molnar.
Signed-off-by: NMandeep Singh Baines <msb@chromium.org>
Cc: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1306127423-3347-4-git-send-email-msb@chromium.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>
LKML-Reference: <20110517071642.GF22305@elte.hu>

This restores the previous behavior of softlock_thresh.

Currently, setting watchdog_thresh to zero causes the watchdog
kthreads to consume a lot of CPU.

In addition, the logic of proc_dowatchdog_thresh and
proc_dowatchdog_enabled has been factored into proc_dowatchdog.
Signed-off-by: NMandeep Singh Baines <msb@chromium.org>
Cc: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1306127423-3347-3-git-send-email-msb@chromium.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>
LKML-Reference: <20110517071018.GE22305@elte.hu>

Don't take any action on an unsuccessful write to /proc.
Signed-off-by: NMandeep Singh Baines <msb@chromium.org>
Cc: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1306127423-3347-2-git-send-email-msb@chromium.orgSigned-off-by: NIngo Molnar <mingo@elte.hu>