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Steven Rostedt 48228f7b47 lockdep/timers: Explain in detail the locking problems del_timer_sync() may cause 
Twice I had to explain the output about why lockdep gives an error with
locks in IRQ context and with del_timer_sync(). Might as well write it
up and place it in the comments above the code in del_timer_sync().
Perhaps the next time this lockdep dump triggers people will understand
the issues.

It is a ticky issue and very subtle, explaining it in detail in the code
may help others understand the issue when they stumble upon the bug
again.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1297186794.23343.19.camel@gandalf.stny.rr.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-02-16 13:35:08 +01:00
..
debug
Merge branch 'master' into for-next
2010-12-22 18:57:02 +01:00
gcov
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
irq
genirq: Prevent irq storm on migration
2011-02-02 22:15:08 +01:00
power
Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6
2011-01-13 20:15:35 -08:00
time
timer debug: Hide kernel addresses via %pK in /proc/timer_list
2011-02-12 14:11:56 +01:00
trace
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
2011-02-09 11:45:21 -08:00
.gitignore
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acct.c
pass a struct path to vfs_statfs
2010-08-09 16:48:42 -04:00
async.c
async: use workqueue for worker pool
2010-07-14 11:29:46 +02:00
audit_tree.c
in untag_chunk() we need to do alloc_chunk() a bit earlier
2010-10-30 02:18:32 -04:00
audit_watch.c
audit: make functions static
2010-10-30 01:42:19 -04:00
audit.c
audit: error message typo correction
2010-11-03 13:49:58 -04:00
audit.h
audit: make functions static
2010-10-30 01:42:19 -04:00
auditfilter.c
Audit: add support to match lsm labels on user audit messages
2010-10-30 01:41:57 -04:00
auditsc.c
audit mmap
2010-10-30 08:45:43 -04:00
backtracetest.c
…
bounds.c
…
capability.c
security: add cred argument to security_capable()
2011-02-11 17:41:58 +11:00
cgroup_freezer.c
cgroup_freezer: update_freezer_state() does incorrect state transitions
2010-10-27 18:03:08 -07:00
cgroup.c
Merge branch 'vfs-scale-working' of git://git.kernel.org/pub/scm/linux/kernel/git/npiggin/linux-npiggin
2011-01-14 09:08:29 -08:00
compat.c
compat: Make compat_alloc_user_space() incorporate the access_ok()
2010-09-14 16:08:45 -07:00
configs.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
cpu.c
Merge branches 'x86-alternatives-for-linus', 'x86-fpu-for-linus', 'x86-hwmon-for-linus', 'x86-paravirt-for-linus', 'core-locking-for-linus' and 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-01-06 11:11:50 -08:00
cpuset.c
convert cgroup and cpuset
2010-10-29 04:17:06 -04:00
cred.c
Merge commit 'v2.6.38-rc5' into core/locking
2011-02-16 13:33:41 +01:00
delayacct.c
…
dma.c
…
elfcore.c
…
exec_domain.c
sys_personality: remove the bogus checks in sys_personality()->__set_personality() path
2010-08-09 20:45:05 -07:00
exit.c
Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-01-11 11:02:13 -08:00
extable.c
…
fork.c
thp: khugepaged
2011-01-13 17:32:43 -08:00
freezer.c
Freezer: Fix a race during freezing of TASK_STOPPED tasks
2010-12-24 15:02:40 +01:00
futex_compat.c
futex: Address compiler warnings in exit_robust_list
2010-11-10 13:27:50 +01:00
futex.c
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
groups.c
kernel/groups.c: fix integer overflow in groups_search
2010-09-09 18:57:24 -07:00
hrtimer.c
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2011-01-13 10:05:56 -08:00
hung_task.c
lockup detector: Fix grammar by adding a missing "to" in the comments
2010-08-17 09:11:52 +02:00
hw_breakpoint.c
perf: Dynamic pmu types
2010-12-16 11:36:43 +01:00
irq_work.c
irq_work: Use per cpu atomics instead of regular atomics
2010-12-18 15:54:48 +01:00
itimer.c
…
jump_label.c
jump label: Make arch_jump_label_text_poke_early() optional
2010-10-29 12:56:13 -04:00
kallsyms.c
Revert "kernel: make /proc/kallsyms mode 400 to reduce ease of attacking"
2010-11-19 11:54:40 -08:00
Kconfig.freezer
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Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
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kexec.c
tree-wide: fix comment/printk typos
2010-11-01 15:38:34 -04:00
kfifo.c
kfifo: fix scatterlist usage
2010-10-01 10:50:58 -07:00
kmod.c
Make do_execve() take a const filename pointer
2010-08-17 18:07:43 -07:00
kprobes.c
Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2011-01-07 17:02:58 -08:00
ksysfs.c
sysfs: add struct file* to bin_attr callbacks
2010-05-21 09:37:31 -07:00
kthread.c
sched: Constify function scope static struct sched_param usage
2011-01-07 15:55:45 +01:00
latencytop.c
fs/proc/base.c, kernel/latencytop.c: convert sprintf_symbol() to %ps
2011-01-13 08:03:16 -08:00
lockdep_internals.h
lockdep: No need to disable preemption in debug atomic ops
2010-05-04 05:38:16 +02:00
lockdep_proc.c
locking, lockdep: Convert sprintf_symbol to %pS
2010-11-10 10:23:58 +01:00
lockdep_states.h
…
lockdep.c
lockdep: Move early boot local IRQ enable/disable status to init/main.c
2011-01-20 13:32:33 +01:00
Makefile
kernel: clean up USE_GENERIC_SMP_HELPERS
2011-01-13 08:03:08 -08:00
module.c
tracepoints: Fix section alignment using pointer array
2011-02-03 09:28:46 -05:00
mutex-debug.c
…
mutex-debug.h
…
mutex.c
mutexes, sched: Introduce arch_mutex_cpu_relax()
2010-11-26 15:05:34 +01:00
mutex.h
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notifier.c
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ns_cgroup.c
cgroup: notify ns_cgroup deprecated
2010-10-27 18:03:09 -07:00
nsproxy.c
…
padata.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2010-08-04 15:23:14 -07:00
panic.c
ACPI, APEI, Generic Hardware Error Source POLL/IRQ/NMI notification type support
2011-01-12 03:06:19 -05:00
params.c
module: show version information for built-in modules in sysfs
2011-01-24 14:32:51 +10:30
perf_event.c
perf: Fix reading in perf_event_read()
2011-02-03 12:15:46 +01:00
pid_namespace.c
…
pid.c
Add RCU check for find_task_by_vpid().
2010-08-19 17:18:02 -07:00
pm_qos_params.c
PM / PM QoS: Fix reversed min and max
2010-11-15 22:45:22 +01:00
posix-cpu-timers.c
posix-cpu-timers: Rcu_read_lock/unlock protect find_task_by_vpid call
2010-11-10 13:07:06 +01:00
posix-timers.c
posix-timers: Annotate lock_timer()
2010-10-21 17:30:06 +02:00
printk.c
cap_syslog: accept CAP_SYS_ADMIN for now
2011-02-10 17:53:55 -08:00
profile.c
llseek: automatically add .llseek fop
2010-10-15 15:53:27 +02:00
ptrace.c
ptrace: use safer wake up on ptrace_detach()
2011-02-11 16:12:19 -08:00
range.c
kernel/range.c: fix clean_sort_range() for the case of full array
2010-11-12 07:55:31 -08:00
rcupdate.c
Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu into core/rcu
2010-10-07 09:43:11 +02:00
rcutiny_plugin.h
rcu: Distinguish between boosting and boosted
2010-11-29 22:01:56 -08:00
rcutiny.c
rcu: avoid pointless blocked-task warnings
2011-01-14 04:58:08 -08:00
rcutorture.c
rcu: add priority-inversion testing to rcutorture
2010-10-07 10:41:08 -07:00
rcutree_plugin.h
rcu: increase synchronize_sched_expedited() batching
2010-12-17 12:34:08 -08:00
rcutree_trace.c
rcu,cleanup: simplify the code when cpu is dying
2010-11-29 22:01:58 -08:00
rcutree.c
Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2011-01-07 17:02:58 -08:00
rcutree.h
rcu: limit rcu_node leaf-level fanout
2010-12-17 12:34:20 -08:00
relay.c
Clean up relay_alloc_page_array() slightly by using vzalloc rather than vmalloc and memset
2010-11-05 08:21:34 -07:00
res_counter.c
…
resource.c
resources: add arch hook for preventing allocation in reserved areas
2010-12-17 10:01:09 -08:00
rtmutex_common.h
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex-debug.c
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex-debug.h
…
rtmutex-tester.c
rtmutex-tester: Remove BKL tests
2011-01-26 15:58:12 +01:00
rtmutex.c
rtmutex: Simplify PI algorithm and make highest prio task get lock
2011-01-27 21:13:51 -05:00
rtmutex.h
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rwsem.c
…
sched_autogroup.c
sched, autogroup: Fix CONFIG_RT_GROUP_SCHED sched_setscheduler() failure
2011-01-18 15:09:42 +01:00
sched_autogroup.h
sched, autogroup: Fix CONFIG_RT_GROUP_SCHED sched_setscheduler() failure
2011-01-18 15:09:42 +01:00
sched_clock.c
sched: Add some clock info to sched_debug
2010-11-23 10:29:08 +01:00
sched_cpupri.c
sched: No need for bootmem special cases
2010-07-17 12:06:22 +02:00
sched_cpupri.h
sched: No need for bootmem special cases
2010-07-17 12:06:22 +02:00
sched_debug.c
sched: Replace rq->bkl_count with rq->rq_sched_info.bkl_count
2011-01-18 15:09:43 +01:00
sched_fair.c
sched: Use rq->clock_task instead of rq->clock for correctly maintaining load averages
2011-01-26 12:31:03 +01:00
sched_features.h
sched: Rewrite tg_shares_up)
2010-11-18 13:27:46 +01:00
sched_idletask.c
…
sched_rt.c
sched: Fix update_curr_rt()
2011-02-03 12:21:33 +01:00
sched_stats.h
sched_stat: Update sched_info_queue/dequeue() code comments
2010-10-24 13:29:01 +02:00
sched_stoptask.c
sched: Fix cross-sched-class wakeup preemption
2010-11-11 14:37:23 +01:00
sched.c
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-01-20 16:37:55 -08:00
seccomp.c
…
semaphore.c
…
signal.c
signals: annotate lock context change on ptrace_stop()
2010-10-27 18:03:12 -07:00
smp.c
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-01-20 18:30:37 -08:00
softirq.c
kernel: clean up USE_GENERIC_SMP_HELPERS
2011-01-13 08:03:08 -08:00
spinlock.c
…
srcu.c
rcu: demote SRCU_SYNCHRONIZE_DELAY from kernel-parameter status
2011-01-14 04:56:49 -08:00
stacktrace.c
…
stop_machine.c
stop_machine: convert cpu notifier to return encapsulate errno value
2010-10-26 16:52:15 -07:00
sys_ni.c
powerpc: define a compat_sys_recv cond_syscall
2010-09-23 17:03:55 +10:00
sys.c
Fix prlimit64 for suid/sgid processes
2011-01-31 13:01:27 +10:00
sysctl_binary.c
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2011-01-13 10:05:56 -08:00
sysctl_check.c
sysctl: min/max bounds are optional
2010-10-15 14:42:24 -07:00
sysctl.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2011-01-26 16:31:44 +10:00
taskstats.c
taskstats: use better ifdef for alignment
2011-01-13 08:03:19 -08:00
test_kprobes.c
kprobes: Fix selftest to clear flags field for reusing probes
2010-10-14 08:55:27 +02:00
time.c
Kill off a bunch of warning: ‘inline’ is not at beginning of declaration
2010-11-28 23:08:04 +01:00
timeconst.pl
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timer.c
lockdep/timers: Explain in detail the locking problems del_timer_sync() may cause
2011-02-16 13:35:08 +01:00
tracepoint.c
tracepoints: Fix section alignment using pointer array
2011-02-03 09:28:46 -05:00
tsacct.c
taskstats: use real microsecond granularity for CPU times
2010-10-27 18:03:17 -07:00
uid16.c
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up.c
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user_namespace.c
user_ns: improve the user_ns on-the-slab packaging
2011-01-13 08:03:18 -08:00
user-return-notifier.c
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user.c
fix freeing user_struct in user cache
2010-12-29 11:31:38 -08:00
utsname_sysctl.c
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utsname.c
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wait.c
docbook: add more wait/wake/completion to device-drivers docbook
2010-10-26 17:32:41 -07:00
watchdog.c
watchdog, nmi: Lower the severity of error messages
2011-02-10 13:21:59 +01:00
workqueue_sched.h
workqueue: implement concurrency managed dynamic worker pool
2010-06-29 10:07:14 +02:00
workqueue.c
workqueue: note the nested NOT_RUNNING test in worker_clr_flags() isn't a noop
2011-01-11 16:03:14 +01:00