提交 b3ab0316 编写于 作者: O Oleg Nesterov 提交者: Linus Torvalds

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: NOleg Nesterov <oleg@redhat.com>
Tested-by: NMichal 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: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 b4360690
...@@ -1329,7 +1329,12 @@ static int wait_task_continued(struct wait_opts *wo, struct task_struct *p) ...@@ -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, static int wait_consider_task(struct wait_opts *wo, int ptrace,
struct task_struct *p) 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) if (!ret)
return ret; return ret;
...@@ -1347,10 +1352,6 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace, ...@@ -1347,10 +1352,6 @@ static int wait_consider_task(struct wait_opts *wo, int ptrace,
return 0; 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)) { if (unlikely(p->exit_state == EXIT_TRACE)) {
/* /*
* ptrace == 0 means we are the natural parent. In this case * ptrace == 0 means we are the natural parent. In this case
......
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