move exit_task_work() past exit_files() et.al.
... and get rid of PF_EXITING check in task_work_add().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/kernel/task_work.c b/kernel/task_work.c
index 76266fb..fb39608 100644
--- a/kernel/task_work.c
+++ b/kernel/task_work.c
@@ -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 *