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Oleg Nesterov 9da33de624 task_work: task_work_add() should not succeed after exit_task_work() 
ed3e694d "move exit_task_work() past exit_files() et.al" destroyed
the add/exit synchronization we had, the caller itself should ensure
task_work_add() can't race with the exiting task.

However, this is not convenient/simple, and the only user which tries
to do this is buggy (see the next patch). Unless the task is current,
there is simply no way to do this in general.

Change exit_task_work()->task_work_run() to use the dummy "work_exited"
entry to let task_work_add() know it should fail.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20120826191211.GA4228@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-09-13 16:47:34 +02:00
..
debug
kernel/debug: Make use of KGDB_REASON_NMI
2012-07-31 08:16:43 -05:00
events
perf/trace: Add ability to set a target task for events
2012-07-31 17:02:05 +02:00
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
2012-08-03 10:56:44 -07:00
power
Revert "NMI watchdog: fix for lockup detector breakage on resume"
2012-08-08 20:49:45 +02:00
sched
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2012-08-20 10:35:05 -07:00
time
time: Move ktime_t overflow checking into timespec_valid_strict
2012-09-01 10:24:48 -07:00
trace
tracing/syscalls: Fix perf syscall tracing when syscall_nr == -1
2012-08-17 15:19:46 -04:00
.gitignore
…
acct.c
Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-01-08 12:19:57 -08:00
async.c
[SCSI] async: make async_synchronize_full() flush all work regardless of domain
2012-07-20 09:07:37 +01:00
audit_tree.c
audit: clean up refcounting in audit-tree
2012-08-15 12:55:22 +02:00
audit_watch.c
get rid of kern_path_parent()
2012-07-14 16:35:02 +04:00
audit.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-08-01 10:26:23 -07:00
audit.h
audit: remove AUDIT_SETUP_CONTEXT as it isn't used
2012-01-17 16:16:57 -05:00
auditfilter.c
audit: allow interfield comparison in audit rules
2012-01-17 16:17:01 -05:00
auditsc.c
seccomp: remove duplicated failure logging
2012-04-14 11:13:20 +10:00
backtracetest.c
…
bounds.c
…
capability.c
userns: Teach inode_capable to understand inodes whose uids map to other namespaces.
2012-05-15 14:59:24 -07:00
cgroup_freezer.c
cgroup: convert all non-memcg controllers to the new cftype interface
2012-04-01 12:09:55 -07:00
cgroup.c
Merge branch 'for-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2012-07-24 17:47:44 -07:00
compat.c
new helper: sigsuspend()
2012-05-21 23:52:30 -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
kernel/cpu_pm.c: fix various typos
2012-05-31 17:49:27 -07:00
cpu.c
mm/hotplug: correctly setup fallback zonelists when creating new pgdat
2012-07-31 18:42:44 -07:00
cpuset.c
cpusets: Remove/update outdated comments
2012-07-24 13:53:28 +02:00
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
keys: kill task_struct->replacement_session_keyring
2012-05-23 22:11:41 -04:00
delayacct.c
KVM: Steal time implementation
2011-07-14 12:59:14 +03:00
dma.c
Remove all #inclusions of asm/system.h
2012-03-28 18:30:03 +01:00
elfcore.c
…
exec_domain.c
…
exit.c
posix_types.h: Cleanup stale __NFDBITS and related definitions
2012-07-26 13:36:43 -07:00
extable.c
extable: Skip sorting if sorted at build time.
2012-04-19 15:06:55 -07:00
fork.c
uprobes: Fix mmap_region()'s mm->mm_rb corruption if uprobe_mmap() fails
2012-08-21 11:48:12 +02:00
freezer.c
PM / Freezer: Remove references to TIF_FREEZE in comments
2012-03-04 23:08:54 +01:00
futex_compat.c
futex: Mark get_robust_list as deprecated
2012-03-29 11:37:17 +02:00
futex.c
futex: Forbid uaddr == uaddr2 in futex_wait_requeue_pi()
2012-07-24 16:02:57 +02:00
groups.c
userns: Convert in_group_p and in_egroup_p to use kgid_t
2012-05-03 03:29:33 -07:00
hrtimer.c
hrtimer: Update hrtimer base offsets each hrtimer_interrupt
2012-07-11 23:34:39 +02:00
hung_task.c
hung task debugging: Inject NMI when hung and going to panic
2012-04-25 12:39:25 +02:00
irq_work.c
irq_work: fix compile failure on tile from missing include
2012-04-13 13:15:16 -04:00
itimer.c
itimer: Use printk_once instead of WARN_ONCE
2012-04-10 11:00:30 +02:00
jump_label.c
static keys: Inline the static_key_enabled() function
2012-02-28 20:01:08 +01:00
kallsyms.c
vsprintf: fix %ps on non symbols when using kallsyms
2012-05-29 16:22:32 -07:00
kcmp.c
syscalls, x86: add __NR_kcmp syscall
2012-05-31 17:49:32 -07:00
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage
2012-03-23 13:18:57 +01:00
Kconfig.preempt
locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage
2012-03-23 13:18:57 +01:00
kexec.c
kdump: append newline to the last lien of vmcoreinfo note
2012-07-30 17:25:20 -07:00
kfifo.c
[media] kernel:kfifo: export __kfifo_max_r symbol
2012-04-11 18:24:37 -03:00
kmod.c
kmod: avoid deadlock from recursive kmod call
2012-07-30 17:25:20 -07:00
kprobes.c
kprobes: return proper error code from register_kprobe()
2012-03-05 15:49:42 -08:00
ksysfs.c
kernel: ksysfs.c is implicitly using stat.h
2011-10-31 09:20:13 -04:00
kthread.c
kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed
2012-07-22 10:15:28 -07:00
latencytop.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
lglock.c
brlocks/lglocks: turn into functions
2012-05-29 23:28:41 -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
lockdep: Add CPU-idle/offline warning to lockdep-RCU splat
2012-02-21 09:06:06 -08:00
Makefile
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-06-01 10:34:35 -07:00
module.c
Guard check in module loader against integer overflow
2012-05-23 22:28:53 +09:30
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
sched/rt: Use schedule_preempt_disabled()
2012-03-01 10:28:03 +01:00
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
padata: Fix cpu hotplug
2012-03-29 19:52:46 +08:00
panic.c
panic: fix a possible deadlock in panic()
2012-07-30 17:25:13 -07:00
params.c
params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)
2012-05-04 17:28:18 -07:00
pid_namespace.c
pidns: guarantee that the pidns init will be the last pidns process reaped
2012-06-20 14:39:36 -07:00
pid.c
mm: add a low limit to alloc_large_system_hash
2012-05-24 00:28:21 -04:00
posix-cpu-timers.c
[S390] cputime: add sparse checking and cleanup
2011-12-15 14:56:19 +01:00
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: Fix calculation of length used to discard records
2012-08-12 21:25:50 +03:00
profile.c
kernel: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
ptrace.c
userns: Convert ptrace, kill, set_priority permission checks to work with kuids and kgids
2012-05-03 03:28:51 -07:00
range.c
range: fix bogus misuse of module.h to get printk()
2011-10-31 09:20:11 -04:00
rcu.h
rcu: Allow nesting of rcu_idle_enter() and rcu_idle_exit()
2012-02-21 09:06:12 -08:00
rcupdate.c
rcu: Consolidate tree/tiny __rcu_read_{,un}lock() implementations
2012-07-02 12:34:23 -07:00
rcutiny_plugin.h
rcu: Fix code-style issues involving "else"
2012-07-06 06:01:48 -07:00
rcutiny.c
rcu: Fix rcu_is_cpu_idle() #ifdef in TINY_RCU
2012-07-02 12:34:25 -07:00
rcutorture.c
rcu: Fix broken strings in RCU's source code.
2012-07-06 06:01:49 -07:00
rcutree_plugin.h
rcu: Fix code-style issues involving "else"
2012-07-06 06:01:48 -07:00
rcutree_trace.c
rcu: Fix broken strings in RCU's source code.
2012-07-06 06:01:49 -07:00
rcutree.c
rcu: Fix code-style issues involving "else"
2012-07-06 06:01:48 -07:00
rcutree.h
Merge branches 'bigrtm.2012.07.04a', 'doctorture.2012.07.02a', 'fixes.2012.07.06a' and 'fnh.2012.07.02a' into HEAD
2012-07-06 05:59:30 -07:00
relay.c
splice: fix racy pipe->buffers uses
2012-06-13 21:16:42 +02:00
res_counter.c
rescounters: add res_counter_uncharge_until()
2012-05-29 16:22:27 -07:00
resource.c
resource: make sure requested range is included in the root range
2012-07-30 17:25:21 -07:00
rtmutex_common.h
…
rtmutex-debug.c
lockdep, rtmutex, bug: Show taint flags on error
2011-12-06 08:16:49 +01:00
rtmutex-debug.h
…
rtmutex-tester.c
rtmutex-tester: convert sysdev_class to a regular subsystem
2011-12-14 14:54:22 -08:00
rtmutex.c
Revert "rcu: Permit rt_mutex_unlock() with irqs disabled"
2011-12-11 10:33:18 -08:00
rtmutex.h
…
rwsem.c
Remove all #inclusions of asm/system.h
2012-03-28 18:30:03 +01:00
seccomp.c
seccomp: fix build warnings when there is no CONFIG_SECCOMP_FILTER
2012-04-18 12:24:52 +10:00
semaphore.c
semaphore: fix improper comment reference to mutex
2012-04-05 17:15:55 -07:00
signal.c
signal: make sure we don't get stopped with pending task_work
2012-07-22 23:57:54 +04:00
smp.c
smp: Remove ipi_call_lock[_irq]()/ipi_call_unlock[_irq]()
2012-06-05 17:27:14 +02:00
smpboot.c
smpboot, idle: Fix comment mismatch over idle_threads_init()
2012-05-24 22:58:08 +02:00
smpboot.h
smpboot: Remove leftover declaration
2012-06-11 15:07:52 +02:00
softirq.c
mm: allow PF_MEMALLOC from softirq context
2012-07-31 18:42:45 -07:00
spinlock.c
locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage
2012-03-23 13:18:57 +01:00
srcu.c
rcu: Implement per-domain single-threaded call_srcu() state machine
2012-04-30 10:48:25 -07:00
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
syscalls, x86: add __NR_kcmp syscall
2012-05-31 17:49:32 -07:00
sys.c
kernel/sys.c: avoid argv_free(NULL)
2012-07-30 17:25:13 -07:00
sysctl_binary.c
mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads
2012-07-31 18:42:40 -07:00
sysctl.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2012-08-01 10:26:23 -07:00
task_work.c
task_work: task_work_add() should not succeed after exit_task_work()
2012-09-13 16:47:34 +02:00
taskstats.c
taskstats: check nla_reserve() return
2012-07-30 17:25:21 -07:00
test_kprobes.c
…
time.c
time: Remove bogus comments
2012-03-15 18:17:55 -07:00
timeconst.pl
…
timer.c
alpha: take a bunch of syscalls into osf_sys.c
2012-08-19 08:41:19 -07:00
tracepoint.c
static keys: Introduce 'struct static_key', static_key_true()/false() and static_key_slow_[inc|dec]()
2012-02-24 10:05:59 +01:00
tsacct.c
[S390] cputime: add sparse checking and cleanup
2011-12-15 14:56:19 +01:00
uid16.c
userns: Convert setting and getting uid and gid system calls to use kuid and kgid
2012-05-03 03:28:41 -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
userns: Store uid and gid values in struct cred with kuid_t and kgid_t types
2012-05-03 03:28:38 -07:00
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
userns: Silence silly gcc warning.
2012-05-19 15:44:40 -06:00
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
userns: Use cred->user_ns instead of cred->user->user_ns
2012-04-07 16:55:51 -07:00
wait.c
lockdep/waitqueues: Add better annotation
2011-12-21 10:07:39 +01:00
watchdog.c
Revert "NMI watchdog: fix for lockup detector breakage on resume"
2012-08-08 20:49:45 +02:00
workqueue_sched.h
…
workqueue.c
workqueue: fix spurious CPU locality WARN from process_one_work()
2012-07-22 10:16:34 -07:00