Commit ed3e694d authored by Al Viro's avatar Al Viro

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

... and get rid of PF_EXITING check in task_work_add().
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 67d12145
...@@ -953,14 +953,11 @@ void do_exit(long code) ...@@ -953,14 +953,11 @@ void do_exit(long code)
exit_signals(tsk); /* sets PF_EXITING */ exit_signals(tsk); /* sets PF_EXITING */
/* /*
* tsk->flags are checked in the futex code to protect against * tsk->flags are checked in the futex code to protect against
* an exiting task cleaning up the robust pi futexes, and in * an exiting task cleaning up the robust pi futexes.
* task_work_add() to avoid the race with exit_task_work().
*/ */
smp_mb(); smp_mb();
raw_spin_unlock_wait(&tsk->pi_lock); raw_spin_unlock_wait(&tsk->pi_lock);
exit_task_work(tsk);
if (unlikely(in_atomic())) if (unlikely(in_atomic()))
printk(KERN_INFO "note: %s[%d] exited with preempt_count %d\n", printk(KERN_INFO "note: %s[%d] exited with preempt_count %d\n",
current->comm, task_pid_nr(current), current->comm, task_pid_nr(current),
...@@ -995,6 +992,7 @@ void do_exit(long code) ...@@ -995,6 +992,7 @@ void do_exit(long code)
exit_shm(tsk); exit_shm(tsk);
exit_files(tsk); exit_files(tsk);
exit_fs(tsk); exit_fs(tsk);
exit_task_work(tsk);
check_stack_usage(); check_stack_usage();
exit_thread(); exit_thread();
......
...@@ -5,34 +5,26 @@ ...@@ -5,34 +5,26 @@
int int
task_work_add(struct task_struct *task, struct callback_head *twork, bool notify) task_work_add(struct task_struct *task, struct callback_head *twork, bool notify)
{ {
struct callback_head *last, *first;
unsigned long flags; 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 * Not inserting the new work if the task has already passed
* exit_task_work(). We rely on do_exit()->raw_spin_unlock_wait() * exit_task_work() is the responisbility of callers.
* and check PF_EXITING under pi_lock.
*/ */
raw_spin_lock_irqsave(&task->pi_lock, flags); raw_spin_lock_irqsave(&task->pi_lock, flags);
if (likely(!(task->flags & PF_EXITING))) { last = task->task_works;
struct callback_head *last = task->task_works; first = last ? last->next : twork;
struct callback_head *first = last ? last->next : twork;
twork->next = first; twork->next = first;
if (last) if (last)
last->next = twork; last->next = twork;
task->task_works = twork; task->task_works = twork;
err = 0;
}
raw_spin_unlock_irqrestore(&task->pi_lock, flags); raw_spin_unlock_irqrestore(&task->pi_lock, flags);
/* test_and_set_bit() implies mb(), see tracehook_notify_resume(). */ /* test_and_set_bit() implies mb(), see tracehook_notify_resume(). */
if (likely(!err) && notify) if (notify)
set_notify_resume(task); set_notify_resume(task);
return err; return 0;
} }
struct callback_head * struct callback_head *
......
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