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a0507c84bf47dfd204299774f45fd16da33f0619
kernel-tenderloin-3.0/kernel
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Peter Zijlstra a0507c84bf perf: Annotate perf_event_read_group() vs perf_event_release_kernel() 
Stephane reported a lockdep warning while using PERF_FORMAT_GROUP.

The issue is that perf_event_read_group() takes faults while holding
the ctx->mutex, while perf_event_release_kernel() can be called from
munmap(). Which makes for an AB-BA deadlock.

Except we can never establish the deadlock because we'll only ever
call perf_event_release_kernel() after all file descriptors are dead
so there is no concurrency possible.

Reported-by: Stephane Eranian <eranian@google.com>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2010-05-07 11:30:59 +02:00
..
gcov
…
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
perf: Fix check at end of event search
2010-05-06 19:49:52 -04:00
.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
…
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
rcu: Fix RCU lockdep splat on freezer_fork path
2010-04-30 12:03:17 +02:00
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
…
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
…
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
Merge branch 'linus' into perf/core
2010-04-08 13:37:18 +02:00
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
…
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
hw_breakpoints: Fix percpu build failure
2010-05-04 08:39:36 +02:00
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
…
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
…
lockdep_proc.c
…
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
…
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
perf: Annotate perf_event_read_group() vs perf_event_release_kernel()
2010-05-07 11:30:59 +02:00
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
…
ptrace.c
x86, perf, bts, mm: Delete the never used BTS-ptrace code
2010-03-26 11:33:55 +01:00
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
…
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
Merge branch 'perf/urgent' into perf/core
2010-05-07 11:30:30 +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
…
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
kernel/sys.c: fix compat uname machine
2010-04-24 11:31:24 -07:00
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
workqueue: flush_delayed_work: keep the original workqueue for re-queueing
2010-04-30 07:24:51 +02:00