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wait: completely ignore the EXIT_DEAD tasks

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Now that EXIT_DEAD is the terminal state it doesn't make sense to call
eligible_child() or security_task_wait() if the task is really dead.

Signed-off-by: Oleg Nesterov <[email protected]>
Tested-by: Michal Schmidt <[email protected]>
Cc: Jan Kratochvil <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Lennart Poettering <[email protected]>
Cc: Roland McGrath <[email protected]>
Cc: Tejun Heo <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Oleg Nesterov authored and Linus Torvalds committed 2014-04-07 16:36:06 -07:00
1 parent b436069059
commit b3ab03160d
1 file changed
+6 -5
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kernel/exit.c
+6 -5
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@@ -1329,7 +1329,12 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p)
static int wait_consider_task(struct wait_opts *wo, int ptrace,
struct task_struct *p)
{
int ret = eligible_child(wo, p);
int ret;
if (unlikely(p->exit_state == EXIT_DEAD))
return 0;
ret = eligible_child(wo, p);
if (!ret)
return ret;
@@ -1347,10 +1352,6 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
return 0;
}
/* dead body doesn't have much to contribute */
if (unlikely(p->exit_state == EXIT_DEAD))
return 0;
if (unlikely(p->exit_state == EXIT_TRACE)) {
/*
* ptrace == 0 means we are the natural parent. In this case