linux-kernel - [PATCH] wait_task_zombie: remove ->exit_state/exit

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Message-ID: <20071124172431.GA8385@tv-sign.ru>
Date:	Sat, 24 Nov 2007 20:24:31 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] wait_task_zombie: remove ->exit_state/exit_signal checks for WNOWAIT

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@...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) {

-
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