The patch titled
posix-timers: always do get_task_struct(timer->it_process)
has been added to the -mm tree. Its filename is
posix-timers-always-do-get_task_structtimer-it_process.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: posix-timers: always do get_task_struct(timer->it_process)
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Change the code to get/put timer->it_process regardless of
SIGEV_THREAD_ID. This streamlines the create/destroy paths and allows us
to simplify the usage of exit_itimers() in de_thread().
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/posix-timers.c | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff -puN kernel/posix-timers.c~posix-timers-always-do-get_task_structtimer-it_process kernel/posix-timers.c
--- a/kernel/posix-timers.c~posix-timers-always-do-get_task_structtimer-it_process
+++ a/kernel/posix-timers.c
@@ -555,11 +555,10 @@ sys_timer_create(const clockid_t which_c
*/
spin_lock_irqsave(&process->sighand->siglock, flags);
if (!(process->flags & PF_EXITING)) {
+ get_task_struct(process);
new_timer->it_process = process;
list_add(&new_timer->list,
&process->signal->posix_timers);
- if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- get_task_struct(process);
spin_unlock_irqrestore(&process->sighand->siglock, flags);
} else {
spin_unlock_irqrestore(&process->sighand->siglock, flags);
@@ -576,6 +575,7 @@ sys_timer_create(const clockid_t which_c
new_timer->it_sigev_signo = SIGALRM;
new_timer->it_sigev_value.sival_int = new_timer->it_id;
process = current->group_leader;
+ get_task_struct(process);
spin_lock_irqsave(&process->sighand->siglock, flags);
new_timer->it_process = process;
list_add(&new_timer->list, &process->signal->posix_timers);
@@ -868,8 +868,7 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- put_task_struct(timer->it_process);
+ put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
@@ -896,8 +895,7 @@ retry_delete:
* This keeps any tasks waiting on the spin lock from thinking
* they got something (see the lock code above).
*/
- if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID))
- put_task_struct(timer->it_process);
+ put_task_struct(timer->it_process);
timer->it_process = NULL;
unlock_timer(timer, flags);
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
semaphore-__down_common-use-signal_pending_state.patch
linux-next.patch
migrate_timers-add-comment-use-spinlock_irq.patch
sched-do_wait_for_common-use-signal_pending_state.patch
wait_task_inactive-dont-consider-task-nivcsw.patch
posix-timers-fix-posix_timer_event-vs-dequeue_signal-race.patch
posix-timers-do_schedule_next_timer-fix-the-setting-of-si_overrun.patch
posix-timers-dont-switch-to-group_leader-if-it_process-dies.patch
posix-timers-always-do-get_task_structtimer-it_process.patch
posix-timers-sys_timer_create-remove-the-buggy-pf_exiting-check.patch
posix-timers-sys_timer_create-simplify-and-s-tasklist-rcu.patch
posix-timers-move-the-initialization-of-timer-sigq-from-send-to-create-path.patch
posix-timers-sys_timer_create-cleanup-the-error-handling.patch
coredump-format_corename-dont-append-%pid-if-multi-threaded.patch
kthread_bind-use-wait_task_inactivetask_uninterruptible.patch
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