Benjamin Herrenschmidt 4b40221048 mutex: Don't spin when the owner CPU is offline or other weird cases ...

Due to recent load-balancer changes that delay the task migration to
the next wakeup, the adaptive mutex spinning ends up in a live lock
when the owner's CPU gets offlined because the cpu_online() check
lives before the owner running check.

This patch changes mutex_spin_on_owner() to return 0 (don't spin) in
any case where we aren't sure about the owner struct validity or CPU
number, and if the said CPU is offline. There is no point going back &
re-evaluate spinning in corner cases like that, let's just go to
sleep.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1271212509.13059.135.camel@pasglop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2010-04-23 11:00:28 +02:00

..

gcov

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irq

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

2010-04-06 13:03:22 -07:00

power

PM / Hibernate: user.c, fix SNAPSHOT_SET_SWAP_AREA handling

2010-04-10 22:28:56 +02:00

time

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

trace

Merge branch 'master' into export-slabh

2010-04-05 11:37:28 +09:00

.gitignore

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acct.c

copy_signal() cleanup: kill taskstats_tgid_init() and acct_init_pacct()

2010-03-12 15:52:39 -08:00

async.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

audit_tree.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

audit_watch.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

audit.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

audit.h

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auditfilter.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

auditsc.c

audit: preface audit printk with audit

2010-04-05 13:19:45 -07:00

backtracetest.c

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bounds.c

kbuild: move bounds.h to include/generated

2009-12-12 13:08:14 +01:00

capability.c

capabilities: Use RCU to protect task lookup in sys_capget

2009-12-10 09:42:48 +11:00

cgroup_freezer.c

Merge branch 'master' into export-slabh

2010-04-05 11:37:28 +09:00

cgroup.c

cgroups: remove duplicate include

2010-03-24 16:31:19 -07:00

compat.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

configs.c

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cpu.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

cpuset.c

cpuset: alloc nodemask_t on the heap rather than the stack

2010-03-24 16:31:21 -07:00

cred-internals.h

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cred.c

CRED: Fix a race in creds_are_invalid() in credentials debugging

2010-04-22 09:14:29 +10:00

delayacct.c

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dma.c

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early_res.c

x86: Do not free zero sized per cpu areas

2010-03-29 18:55:40 +02:00

elfcore.c

elf coredump: add extended numbering support

2010-03-06 11:26:46 -08:00

exec_domain.c

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exit.c

mm: avoid null-pointer deref in sync_mm_rss()

2010-04-07 08:38:02 -07:00

extable.c

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fork.c

mm: avoid null-pointer deref in sync_mm_rss()

2010-04-07 08:38:02 -07:00

freezer.c

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futex_compat.c

futex: Protect pid lookup in compat code with RCU

2009-12-09 14:22:14 +01:00

futex.c

futex: Handle futex value corruption gracefully

2010-02-03 15:13:22 +01:00

groups.c

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hrtimer.c

hrtimers: Convert to raw_spinlocks

2009-12-14 23:55:34 +01:00

hung_task.c

softlockup: Fix hung_task_check_count sysctl

2009-11-27 06:21:57 +01:00

hw_breakpoint.c

Merge branch 'perf/core' into perf/urgent

2010-03-04 11:47:52 +01:00

itimer.c

itimers: Fix racy writes to cpu_itimer fields

2009-11-18 16:32:12 +01:00

kallsyms.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

Kconfig.freezer

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Kconfig.hz

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Kconfig.locks

mutex: Better control mutex adaptive spinning config

2009-12-03 11:50:11 +01:00

Kconfig.preempt

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kexec.c

percpu: add __percpu sparse annotations to core kernel subsystems

2010-02-17 11:17:38 +09:00

kfifo.c

kfifo: Don't use integer as NULL pointer

2010-02-16 15:11:08 -08:00

kgdb.c

kgdb: Turn off tracing while in the debugger

2010-04-02 14:58:19 -05:00

kmod.c

kmod: fix resource leak in call_usermodehelper_pipe()

2010-01-11 09:34:04 -08:00

kprobes.c

kprobes: Calculate the index correctly when freeing the out-of-line execution slot

2010-03-11 14:06:16 +01:00

ksysfs.c

Merge branch 'for-next' into for-linus

2010-03-08 16:55:37 +01:00

kthread.c

cpuset: fix the problem that cpuset_mem_spread_node() returns an offline node

2010-03-24 16:31:21 -07:00

latencytop.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

lockdep_internals.h

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lockdep_proc.c

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lockdep_states.h

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lockdep.c

Merge branch 'slabh' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc

2010-04-05 09:39:11 -07:00

Makefile

elf coredump: replace ELF_CORE_EXTRA_* macros by functions

2010-03-06 11:26:45 -08:00

module.c

Fix up possibly racy module refcounting

2010-04-05 19:50:02 -07:00

mutex-debug.c

headers: remove sched.h from interrupt.h

2009-10-11 11:20:58 -07:00

mutex-debug.h

locking: Implement new raw_spinlock

2009-12-14 23:55:32 +01:00

mutex.c

mutex: Better control mutex adaptive spinning config

2009-12-03 11:50:11 +01:00

mutex.h

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notifier.c

sched: Use lockdep-based checking on rcu_dereference()

2010-02-25 10:34:26 +01:00

ns_cgroup.c

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nsproxy.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

padata.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

panic.c

panic: fix panic_timeout accuracy when running on a hypervisor

2010-03-06 11:26:33 -08:00

params.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2010-03-12 16:04:50 -08:00

perf_event.c

Merge branch 'master' into export-slabh

2010-04-05 11:37:28 +09:00

pid_namespace.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

pid.c

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

2010-03-13 14:43:01 -08:00

pm_qos_params.c

pm_qos: clean up racy global "name" variable

2009-10-14 15:31:10 +02:00

posix-cpu-timers.c

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

2010-03-26 15:10:38 -07:00

posix-timers.c

posix-timers.c: Don't export local functions

2010-02-05 14:54:10 +01:00

printk.c

printk: avoid warning when CONFIG_PRINTK is disabled

2010-03-06 11:26:33 -08:00

profile.c

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ptrace.c

ptrace: Fix ptrace_regset() comments and diagnose errors specifically

2010-02-23 13:45:26 -08:00

range.c

x86: Change range end to start+size

2010-02-10 17:47:17 -08:00

rcupdate.c

rcu: Make RCU lockdep check the lockdep_recursion variable

2010-04-19 08:37:19 +02:00

rcutiny.c

rcu: Eliminate unneeded function wrapping

2009-11-22 18:58:16 +01:00

rcutorture.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2010-03-03 07:34:18 -08:00

rcutree_plugin.h

rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU

2010-02-28 09:17:42 +01:00

rcutree_trace.c

rcu: Stop overflowing signed integers

2010-02-25 10:34:57 +01:00

rcutree.c

rcu: Fix accelerated grace periods for last non-dynticked CPU

2010-02-27 09:53:52 +01:00

rcutree.h

rcu: Increase RCU CPU stall timeouts if PROVE_RCU

2010-03-11 13:38:01 +01:00

relay.c

splice: comparing unsigned int < 0

2010-03-06 11:26:32 -08:00

res_counter.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

resource.c

resources: add interfaces that return conflict information

2010-03-23 13:33:50 -07:00

rtmutex_common.h

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rtmutex-debug.c

sched: Convert pi_lock to raw_spinlock

2009-12-14 23:55:33 +01:00

rtmutex-debug.h

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rtmutex-tester.c

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rtmutex.c

rtmutes: Convert rtmutex.lock to raw_spinlock

2009-12-14 23:55:33 +01:00

rtmutex.h

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rwsem.c

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sched_clock.c

sched: Fix cpu_clock() in NMIs, on !CONFIG_HAVE_UNSTABLE_SCHED_CLOCK

2009-12-15 09:04:36 +01:00

sched_cpupri.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

sched_cpupri.h

sched: Convert cpupri lock to raw_spinlock

2009-12-14 23:55:33 +01:00

sched_debug.c

sched: Fix proc_sched_set_task()

2010-04-02 20:06:40 +02:00

sched_fair.c

sched, rcu: Fix rcu_dereference() for RCU-lockdep

2010-03-01 09:29:58 +01:00

sched_features.h

sched: Discard some old bits

2009-12-09 10:03:07 +01:00

sched_idletask.c

sched: Remove the sched_class load_balance methods

2010-01-21 13:40:09 +01:00

sched_rt.c

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

2010-03-13 14:46:18 -08:00

sched_stats.h

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sched.c

mutex: Don't spin when the owner CPU is offline or other weird cases

2010-04-23 11:00:28 +02:00

seccomp.c

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semaphore.c

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signal.c

kernel core: use helpers for rlimits

2010-03-06 11:26:33 -08:00

slow-work-debugfs.c

SLOW_WORK: Move slow_work's proc file to debugfs

2009-12-01 08:20:31 -08:00

slow-work.c

slow-work: use get_ref wrapper instead of directly calling get_ref

2010-03-29 09:13:30 -07:00

slow-work.h

SLOW_WORK: CONFIG_SLOW_WORK_PROC should be CONFIG_SLOW_WORK_DEBUG

2010-03-29 09:14:47 -07:00

smp.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

softirq.c

hrtimer, softirq: Fix hrtimer->softirq trampoline

2010-02-03 18:17:40 +01:00

softlockup.c

softlockup: Stop spurious softlockup messages due to overflow

2010-03-21 19:30:13 +01:00

spinlock.c

locking: Cleanup the name space completely

2009-12-14 23:55:33 +01:00

srcu.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

stacktrace.c

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stop_machine.c

percpu: add __percpu sparse annotations to core kernel subsystems

2010-02-17 11:17:38 +09:00

sys_ni.c

Add generic sys_ipc wrapper

2010-03-12 15:52:32 -08:00

sys.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

sysctl_binary.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

sysctl_check.c

ipv4 05/05: add sysctl to accept packets with local source addresses

2009-12-03 12:14:38 -08:00

sysctl.c

sysctl extern cleanup: lockdep

2010-03-12 15:53:10 -08:00

taskstats.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

test_kprobes.c

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time.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

timeconst.pl

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timer.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

tracepoint.c

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tsacct.c

mm: clean up mm_counter

2010-03-06 11:26:23 -08:00

uid16.c

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up.c

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user_namespace.c

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user-return-notifier.c

core: Clean up user return notifers use of per_cpu

2009-12-02 10:22:59 +01:00

user.c

sched: Remove USER_SCHED

2010-01-21 13:40:18 +01:00

utsname_sysctl.c

sysctl kernel: Remove binary sysctl logic

2009-11-12 02:04:55 -08:00

utsname.c

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wait.c

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workqueue.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2009-12-10 09:35:44 -08:00