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move exit_task_work() past exit_files() et.al.

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... and get rid of PF_EXITING check in task_work_add().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-06-27 11:31:24 +04:00
parent 67d1214551
commit ed3e694d78
2 changed files with 13 additions and 23 deletions
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30
kernel/task_work.c
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@ -5,34 +5,26 @@
int
task_work_add(struct task_struct *task, struct callback_head *twork, bool notify)
{
struct callback_head *last, *first;
unsigned long flags;
int err = -ESRCH;
#ifndef TIF_NOTIFY_RESUME
if (notify)
return -ENOTSUPP;
#endif
/*
* We must not insert the new work if the task has already passed
* exit_task_work(). We rely on do_exit()->raw_spin_unlock_wait()
* and check PF_EXITING under pi_lock.
* Not inserting the new work if the task has already passed
* exit_task_work() is the responisbility of callers.
*/
raw_spin_lock_irqsave(&task->pi_lock, flags);
if (likely(!(task->flags & PF_EXITING))) {
struct callback_head *last = task->task_works;
struct callback_head *first = last ? last->next : twork;
twork->next = first;
if (last)
last->next = twork;
task->task_works = twork;
err = 0;
}
last = task->task_works;
first = last ? last->next : twork;
twork->next = first;
if (last)
last->next = twork;
task->task_works = twork;
raw_spin_unlock_irqrestore(&task->pi_lock, flags);
/* test_and_set_bit() implies mb(), see tracehook_notify_resume(). */
if (likely(!err) && notify)
if (notify)
set_notify_resume(task);
return err;
return 0;
}
struct callback_head *