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wait: completely ignore the EXIT_DEAD tasks 

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 <oleg@redhat.com>
Tested-by: Michal Schmidt <mschmidt@redhat.com>
Cc: Jan Kratochvil <jan.kratochvil@redhat.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Lennart Poettering <lpoetter@redhat.com>
Cc: Roland McGrath <roland@hack.frob.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2014-04-07 15:38:45 -07:00 committed by Linus Torvalds
parent b436069059
commit b3ab03160d
1 changed files with 6 additions and 5 deletions
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11
kernel/exit.c
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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