Peter Zijlstra 3a80b4a353 perf_counter: Fix a race on perf_counter_ctx ...

While extending perfcounters with BTS hw-tracing, Markus
Metzger managed to trigger this warning:

   [  995.557128] WARNING: at kernel/perf_counter.c:1191 __perf_counter_task_sched_out+0x48/0x6b()

triggers because commit
9f498cc5be7e013d8d6e4c616980ed0ffc8680d2 (perf_counter: Full
task tracing) removed clearing of tsk->perf_counter_ctxp out
from under ctx->lock which introduced a race (against
perf_lock_task_context).

Move it back and deal with the exit notification by explicitly
passing along the former task context.

Reported-by: Markus T Metzger <markus.t.metzger@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1249667341.17467.5.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2009-08-09 12:54:46 +02:00

..

gcov

gcov: enable GCOV_PROFILE_ALL for x86_64

2009-06-18 13:03:58 -07:00

irq

genirq: Fix UP compile failure caused by irq_thread_check_affinity

2009-07-22 23:18:46 +02:00

power

headers: smp_lock.h redux

2009-07-12 12:22:34 -07:00

time

clocksource: Prevent NULL pointer dereference

2009-07-19 17:15:54 +02:00

trace

perf_counter: Fix/complete ftrace event records sampling

2009-08-09 12:53:48 +02:00

.gitignore

…

acct.c

bsdacct: fix access to invalid filp in acct_on()

2009-06-30 18:56:00 -07:00

async.c

async: Fix lack of boot-time console due to insufficient synchronization

2009-06-08 12:31:53 -07:00

audit_tree.c

Fix rule eviction order for AUDIT_DIR

2009-06-24 00:02:38 -04:00

audit_watch.c

Audit: clean up all op= output to include string quoting

2009-06-24 00:00:52 -04:00

audit.c

Fix rule eviction order for AUDIT_DIR

2009-06-24 00:02:38 -04:00

audit.h

Fix rule eviction order for AUDIT_DIR

2009-06-24 00:02:38 -04:00

auditfilter.c

Audit: clean up all op= output to include string quoting

2009-06-24 00:00:52 -04:00

auditsc.c

Fix rule eviction order for AUDIT_DIR

2009-06-24 00:02:38 -04:00

backtracetest.c

…

bounds.c

…

capability.c

…

cgroup_debug.c

debug cgroup: remove unneeded cgroup_lock

2009-04-02 19:04:54 -07:00

cgroup_freezer.c

…

cgroup.c

cgroup avoid permanent sleep at rmdir

2009-07-29 19:10:35 -07:00

compat.c

signals: implement sys_rt_tgsigqueueinfo

2009-04-30 19:24:24 +02:00

configs.c

…

cpu.c

mm/init: cpu_hotplug_init() must be initialized before SLAB

2009-06-22 21:18:12 -07:00

cpuset.c

cpuset,mm: update tasks' mems_allowed in time

2009-06-16 19:47:31 -07:00

cred-internals.h

…

cred.c

CRED: Rename cred_exec_mutex to reflect that it's a guard against ptrace

2009-05-11 08:15:36 +10:00

delayacct.c

…

dma-coherent.c

…

dma.c

…

exec_domain.c

Get rid of indirect include of fs_struct.h

2009-03-31 23:00:27 -04:00

exit.c

headers: mnt_namespace.h redux

2009-07-08 09:31:56 -07:00

extable.c

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

2009-04-05 11:04:19 -07:00

fork.c

execve: must clear current->clear_child_tid

2009-08-07 10:39:56 -07:00

freezer.c

sched: fix nr_uninterruptible accounting of frozen tasks really

2009-07-18 14:19:53 +02:00

futex_compat.c

…

futex.c

futexes: Fix infinite loop in get_futex_key() on huge page

2009-07-11 12:40:44 +02:00

groups.c

groups: move code to kernel/groups.c

2009-06-16 19:47:48 -07:00

hrtimer.c

hrtimer: Fix migration expiry check

2009-07-10 17:32:55 +02:00

hung_task.c

…

itimer.c

…

kallsyms.c

kernel/kallsyms.c: replace deprecated __initcall with device_initcall and fix whitespace

2009-06-09 22:37:52 +02:00

Kconfig.freezer

…

Kconfig.hz

…

Kconfig.preempt

…

kexec.c

kexec: fix omitting offset in extended crashkernel syntax

2009-07-29 19:10:34 -07:00

kfifo.c

kernel/kfifo.c: replace conditional test with is_power_of_2()

2009-06-16 19:47:47 -07:00

kgdb.c

sysrq, intel_fb: fix sysrq g collision

2009-05-15 07:56:24 -05:00

kmod.c

headers: mnt_namespace.h redux

2009-07-08 09:31:56 -07:00

kprobes.c

kprobes: Use kernel_text_address() for checking probe address

2009-07-30 16:44:06 -07:00

ksysfs.c

…

kthread.c

update the comment in kthread_stop()

2009-07-27 12:15:46 -07:00

latencytop.c

…

lockdep_internals.h

lockdep: increase MAX_LOCKDEP_ENTRIES and MAX_LOCKDEP_CHAINS

2009-05-12 19:59:52 +02:00

lockdep_proc.c

…

lockdep_states.h

…

lockdep.c

Merge branch 'linus' into tracing/core

2009-05-07 11:17:34 +02:00

Makefile

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

2009-06-28 11:05:04 -07:00

marker.c

…

module.c

module: use MODULE_SYMBOL_PREFIX with module_layout

2009-07-27 12:15:45 -07:00

mutex-debug.c

…

mutex-debug.h

…

mutex.c

Merge branch 'linus' into perfcounters/core

2009-06-11 17:55:42 +02:00

mutex.h

…

notifier.c

…

ns_cgroup.c

cgroups: relax ns_can_attach checks to allow attaching to grandchild cgroups

2009-04-02 19:04:53 -07:00

nsproxy.c

nsproxy: extract create_nsproxy()

2009-06-18 13:03:56 -07:00

panic.c

trace: stop tracer in oops_enter()

2009-07-24 15:30:45 -04:00

params.c

module_param: allow 'bool' module_params to be bool, not just int.

2009-06-12 21:46:58 +09:30

perf_counter.c

perf_counter: Fix a race on perf_counter_ctx

2009-08-09 12:54:46 +02:00

pid_namespace.c

pidns: rewrite copy_pid_ns()

2009-06-18 13:03:55 -07:00

pid.c

kmemleak: Remove alloc_bootmem annotations introduced in the past

2009-07-09 17:07:02 +01:00

pm_qos_params.c

…

posix-cpu-timers.c

kernel/posix-cpu-timers.c: fix sparse warning

2009-04-30 08:08:31 +02:00

posix-timers.c

posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAW

2009-08-04 10:16:41 +02:00

printk.c

printk: Add KERN_DEFAULT printk log-level

2009-06-16 11:02:28 -07:00

profile.c

profile: suppress warning about large allocations when profile=1 is specified

2009-07-29 19:10:36 -07:00

ptrace.c

cred_guard_mutex: do not return -EINTR to user-space

2009-07-06 13:57:04 -07:00

rcuclassic.c

kmemtrace, rcu: fix linux/rcutree.h and linux/rcuclassic.h dependencies

2009-04-03 12:23:02 +02:00

rcupdate.c

RCU: Don't try and predeclare inline funcs as it upsets some versions of gcc

2009-04-15 13:55:14 -07:00

rcupreempt_trace.c

…

rcupreempt.c

rcu: rcu_sched_grace_period(): kill the bogus flush_signals()

2009-05-05 20:28:05 +02:00

rcutorture.c

cpumask: convert rcutorture.c

2009-03-30 22:05:16 +10:30

rcutree_trace.c

rcu: Add __rcu_pending tracing to hierarchical RCU

2009-04-14 11:33:43 +02:00

rcutree.c

rcu: Mark Hierarchical RCU no longer experimental

2009-06-24 15:02:48 +02:00

rcutree.h

kmemtrace, rcu: fix rcu_tree_trace.c data structure dependencies

2009-04-03 12:23:03 +02:00

relay.c

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

2009-04-05 11:04:19 -07:00

res_counter.c

memcg: add interface to reset limits

2009-06-18 13:03:48 -07:00

resource.c

kernel/resource.c: fix sign extension in reserve_setup()

2009-06-30 18:56:00 -07:00

rtmutex_common.h

rt_mutex: add proxy lock routines

2009-04-06 11:14:02 +02:00

rtmutex-debug.c

…

rtmutex-debug.h

…

rtmutex-tester.c

…

rtmutex.c

trivial: fix ETIMEOUT -> ETIMEDOUT typos

2009-06-12 18:01:50 +02:00

rtmutex.h

…

rwsem.c

…

sched_clock.c

sched: Fix fallback sched_clock()'s offset when using jiffies

2009-05-09 10:08:19 +02:00

sched_cpupri.c

sched: Fix race in cpupri introduced by cpumask_var changes

2009-08-02 14:23:29 +02:00

sched_cpupri.h

cpumask: remove cpumask_t from core

2009-03-30 22:05:17 +10:30

sched_debug.c

sched: Hide runqueues from direct refer at source code level

2009-06-17 18:29:42 +02:00

sched_fair.c

sched: Fix latencytop and sleep profiling vs group scheduling

2009-08-02 14:10:12 +02:00

sched_features.h

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

2009-03-30 17:17:35 -07:00

sched_idletask.c

sched, timers: move calc_load() to scheduler

2009-05-15 15:32:45 +02:00

sched_rt.c

sched_rt: Fix overload bug on rt group scheduling

2009-07-10 10:43:29 +02:00

sched_stats.h

sched: remove unused fields from struct rq

2009-03-24 23:16:51 +01:00

sched.c

sched: fix load average accounting vs. cpu hotplug

2009-07-18 14:19:52 +02:00

seccomp.c

…

semaphore.c

…

signal.c

do_sigaltstack: small cleanups

2009-08-01 11:18:56 -07:00

slow-work.c

slow-work: use round_jiffies() for thread pool's cull and OOM timers

2009-06-16 19:47:49 -07:00

smp.c

generic-ipi: fix hotplug_cfd()

2009-08-07 10:39:55 -07:00

softirq.c

softirq: introduce tasklet_hrtimer infrastructure

2009-07-22 17:01:17 +02:00

softlockup.c

…

spinlock.c

Allow rwlocks to re-enable interrupts

2009-04-02 19:05:11 -07:00

srcu.c

…

stacktrace.c

…

stop_machine.c

cpumask: remove cpumask_t from core

2009-03-30 22:05:17 +10:30

sys_ni.c

…

sys.c

groups: move code to kernel/groups.c

2009-06-16 19:47:48 -07:00

sysctl_check.c

…

sysctl.c

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

2009-06-28 11:05:28 -07:00

taskstats.c

…

test_kprobes.c

…

time.c

…

timeconst.pl

…

timer.c

timer: Avoid reading uninitialized data

2009-07-18 23:11:43 +02:00

tracepoint.c

tracepoints: dont update zero-sized tracepoint sections

2009-03-18 19:55:00 +01:00

tsacct.c

…

uid16.c

…

up.c

…

user_namespace.c

…

user.c

sched: delayed cleanup of user_struct

2009-06-15 21:30:23 -07:00

utsname_sysctl.c

proc_sysctl: use CONFIG_PROC_SYSCTL around ipc and utsname proc_handlers

2009-04-02 19:05:01 -07:00

utsname.c

utsns: extract creeate_uts_ns()

2009-06-18 13:03:55 -07:00

wait.c

wait: don't use __wake_up_common()

2009-04-14 17:17:16 +02:00

workqueue.c

ftrace, workqueuetrace: make workqueue tracepoints use TRACE_EVENT macro

2009-06-02 01:10:40 +02:00