From: Oleg Nesterov <oleg@tv-sign.ru>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Roland McGrath <roland@redhat.com>, linux-kernel@vger.kernel.org
Subject: [PATCH] wait_task_zombie: remove ->exit_state/exit_signal checks for WNOWAIT
Date: Sat, 24 Nov 2007 20:24:31 +0300 [thread overview]
Message-ID: <20071124172431.GA8385@tv-sign.ru> (raw)
The first "p->exit_state != EXIT_ZOMBIE" check doesn't make too much sense. The
exit_state was EXIT_ZOMBIE when the function was called, and another thread can
change it to EXIT_DEAD right after the check.
The second condition is not possible, detached non-traced threads were already
filtered out by eligible_child(), we didn't drop tasklist since then.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- PT/kernel/exit.c~8_wtz_dead_code 2007-11-24 19:28:11.000000000 +0300
+++ PT/kernel/exit.c 2007-11-24 20:02:27.000000000 +0300
@@ -1193,10 +1193,6 @@ static int wait_task_zombie(struct task_
int exit_code = p->exit_code;
int why, status;
- if (unlikely(p->exit_state != EXIT_ZOMBIE))
- return 0;
- if (unlikely(p->exit_signal == -1 && p->ptrace == 0))
- return 0;
get_task_struct(p);
read_unlock(&tasklist_lock);
if ((exit_code & 0x7f) == 0) {
reply other threads:[~2007-11-24 17:24 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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