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Tejun Heo 8a32c441c1 freezer: implement and use kthread_freezable_should_stop() 
Writeback and thinkpad_acpi have been using thaw_process() to prevent
deadlock between the freezer and kthread_stop(); unfortunately, this
is inherently racy - nothing prevents freezing from happening between
thaw_process() and kthread_stop().

This patch implements kthread_freezable_should_stop() which enters
refrigerator if necessary but is guaranteed to return if
kthread_stop() is invoked.  Both thaw_process() users are converted to
use the new function.

Note that this deadlock condition exists for many of freezable
kthreads.  They need to be converted to use the new should_stop or
freezable workqueue.

Tested with synthetic test case.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Henrique de Moraes Holschuh <ibm-acpi@hmh.eng.br>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
2011-11-21 12:32:23 -08:00
..
debug
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
events
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
gcov
gcov: disable CONSTRUCTORS for UML
2011-07-26 16:49:45 -07:00
irq
Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2011-11-17 11:46:26 -02:00
power
PM / Suspend: Fix bug in suspend statistics update
2011-11-19 14:37:57 +01:00
time
kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure
2011-10-31 19:30:05 -04:00
trace
kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure
2011-10-31 19:30:05 -04:00
.gitignore
…
acct.c
…
async.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
audit_tree.c
audit_tree,rcu: Convert call_rcu(__put_tree) to kfree_rcu()
2011-07-20 14:10:11 -07:00
audit_watch.c
kill path_lookup()
2011-03-14 09:15:23 -04:00
audit.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
audit.h
…
auditfilter.c
netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms
2011-03-03 10:55:40 -08:00
auditsc.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
backtracetest.c
…
bounds.c
memcg: remove direct page_cgroup-to-page pointer
2011-03-23 19:46:28 -07:00
capability.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
cgroup_freezer.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
cgroup.c
memcg: replace ss->id_lock with a rwlock
2011-11-02 16:07:03 -07:00
compat.c
kernel: Fix files explicitly needing EXPORT_SYMBOL infrastructure
2011-10-31 19:30:05 -04:00
configs.c
kernel/configs.c: include MODULE_*() when CONFIG_IKCONFIG_PROC=n
2011-07-25 20:57:15 -07:00
cpu_pm.c
cpu_pm: call notifiers during suspend
2011-09-23 12:05:29 +05:30
cpu.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
cpuset.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
crash_dump.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
cred.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
delayacct.c
KVM: Steal time implementation
2011-07-14 12:59:14 +03:00
dma.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
elfcore.c
…
exec_domain.c
…
exit.c
oom: remove oom_disable_count
2011-10-31 17:30:45 -07:00
extable.c
extable, core_kernel_data(): Make sure all archs define _sdata
2011-05-20 08:56:56 +02:00
fork.c
Merge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
2011-11-06 19:02:23 -08:00
freezer.c
freezer: implement and use kthread_freezable_should_stop()
2011-11-21 12:32:23 -08:00
futex_compat.c
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
futex.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
groups.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
hrtimer.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
hung_task.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
irq_work.c
kernel: fix two implicit header assumptions in irq_work.c
2011-10-31 09:20:12 -04:00
itimer.c
…
jump_label.c
jump-label: initialize jump-label subsystem much earlier
2011-10-25 11:55:15 -07:00
kallsyms.c
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2011-03-25 17:52:22 -07:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
arch:Kconfig.locks Remove unused config option.
2011-04-10 17:01:05 +02:00
Kconfig.preempt
sched: Isolate preempt counting in its own config option
2011-06-10 15:15:40 +02:00
kexec.c
[S390] kdump: Add infrastructure for unmapping crashkernel memory
2011-10-30 15:16:42 +01:00
kfifo.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
kmod.c
kmod: prevent kmod_loop_msg overflow in __request_module()
2011-10-26 13:10:39 +10:30
kprobes.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
ksysfs.c
kernel: ksysfs.c is implicitly using stat.h
2011-10-31 09:20:13 -04:00
kthread.c
freezer: implement and use kthread_freezable_should_stop()
2011-11-21 12:32:23 -08:00
latencytop.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
lockdep_internals.h
…
lockdep_proc.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
lockdep_states.h
…
lockdep.c
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2011-10-26 16:26:53 +02:00
Makefile
Merge branch 'devel-stable' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm
2011-10-28 12:02:27 -07:00
module.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
mutex-debug.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
mutex-debug.h
mutex: Use p->on_cpu for the adaptive spin
2011-04-14 08:52:33 +02:00
mutex.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
mutex.h
mutex: Use p->on_cpu for the adaptive spin
2011-04-14 08:52:33 +02:00
notifier.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
nsproxy.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
padata.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
panic.c
module,bug: Add TAINT_OOT_MODULE flag for modules not built in-tree
2011-11-07 07:54:42 +10:30
params.c
kernel: params.c needs module.h not moduleparam.h
2011-10-31 09:20:13 -04:00
pid_namespace.c
pidns: call pid_ns_prepare_proc() from create_pid_namespace()
2011-03-23 19:46:58 -07:00
pid.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
posix-cpu-timers.c
Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2011-10-26 16:17:32 +02:00
posix-timers.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
printk.c
printk: remove bounds checking for log_prefix
2011-10-31 17:30:53 -07:00
profile.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
ptrace.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
range.c
range: fix bogus misuse of module.h to get printk()
2011-10-31 09:20:11 -04:00
rcu.h
rcu: Add grace-period, quiescent-state, and call_rcu trace events
2011-09-28 21:38:21 -07:00
rcupdate.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
rcutiny_plugin.h
kernel: fix up module header handling in rcutiny files
2011-10-31 09:20:13 -04:00
rcutiny.c
kernel: fix up module header handling in rcutiny files
2011-10-31 09:20:13 -04:00
rcutorture.c
rcu: Make rcu_torture_boost() exit loops at end of test
2011-09-28 21:38:46 -07:00
rcutree_plugin.h
rcu: Remove rcu_needs_cpu_flush() to avoid false quiescent states
2011-09-28 21:38:48 -07:00
rcutree_trace.c
rcu: Simplify quiescent-state accounting
2011-09-28 21:38:22 -07:00
rcutree.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
rcutree.h
rcu: Remove rcu_needs_cpu_flush() to avoid false quiescent states
2011-09-28 21:38:48 -07:00
relay.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
res_counter.c
memcg: res_counter_read_u64(): fix potential races on 32-bit machines
2011-03-23 19:46:22 -07:00
resource.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
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
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
rtmutex-debug.h
…
rtmutex-tester.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
rtmutex.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
rtmutex.h
…
rwsem.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
sched_autogroup.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
sched_autogroup.h
sched: Skip autogroup when looking for all rt sched groups
2011-07-01 10:39:08 +02:00
sched_clock.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
sched_cpupri.c
sched/cpupri: Remove cpupri->pri_active
2011-08-14 12:01:11 +02:00
sched_cpupri.h
sched/cpupri: Remove cpupri->pri_active
2011-08-14 12:01:11 +02:00
sched_debug.c
sched: Get rid of lock_depth
2011-04-24 13:18:38 +02:00
sched_fair.c
sched: Wrap scheduler p->cpus_allowed access
2011-10-06 12:46:56 +02:00
sched_features.h
sched: Kill WAKEUP_PREEMPT
2011-08-14 12:00:41 +02:00
sched_idletask.c
sched: Drop the rq argument to sched_class::select_task_rq()
2011-04-14 08:52:36 +02:00
sched_rt.c
sched: Warn on rt throttling
2011-10-06 12:47:04 +02:00
sched_stats.h
locking, sched: Annotate thread_group_cputimer as raw
2011-09-13 11:11:55 +02:00
sched_stoptask.c
sched: Implement hierarchical task accounting for SCHED_OTHER
2011-08-14 12:01:13 +02:00
sched.c
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
2011-11-06 17:12:03 -08:00
seccomp.c
…
semaphore.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
signal.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
smp.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
softirq.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
spinlock.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
srcu.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
stacktrace.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
stop_machine.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
sys_ni.c
Cross Memory Attach
2011-10-31 17:30:44 -07:00
sys.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
sysctl_binary.c
ipv4: NET_IPV4_ROUTE_GC_INTERVAL removal
2011-10-03 14:13:01 -04:00
sysctl_check.c
xfs: remove subdirectories
2011-08-12 16:21:35 -05:00
sysctl.c
Merge branch 'akpm' (Andrew's incoming)
2011-10-31 17:46:07 -07:00
taskstats.c
Make TASKSTATS require root access
2011-09-19 17:04:37 -07:00
test_kprobes.c
…
time.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
timeconst.pl
…
timer.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
tracepoint.c
Tracepoint: Dissociate from module mutex
2011-08-10 20:38:14 -04:00
tsacct.c
Make taskstats round statistics down to nearest 1k bytes/events
2011-09-19 17:10:57 -07:00
uid16.c
userns: user namespaces: convert several capable() calls
2011-03-23 19:47:08 -07:00
up.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
user_namespace.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
user-return-notifier.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
user.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
utsname_sysctl.c
Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux
2011-11-06 19:44:47 -08:00
utsname.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
wait.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
watchdog.c
watchdog: move watchdog_*_all_cpus under CONFIG_SYSCTL
2011-10-31 17:30:53 -07:00
workqueue_sched.h
…
workqueue.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00