linux-kernel - [PATCH 1/3] futex_find_get_task: remove an obscure EXIT

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Date:	Mon, 21 Aug 2006 21:06:04 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...l.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] futex_find_get_task: remove an obscure EXIT_ZOMBIE check

(Compile tested).

futex_find_get_task:

	if (p->state == EXIT_ZOMBIE || p->exit_state == EXIT_ZOMBIE)
		return NULL;

I can't understand this. First, p->state can't be EXIT_ZOMBIE. The ->exit_state
check looks strange too. Sub-threads or tasks whose ->parent ignores SIGCHLD go
directly to EXIT_DEAD state (I am ignoring a ptrace case). Why EXIT_DEAD tasks
should be ok? Yes, EXIT_ZOMBIE is more important (a task may stay zombie for a
long time), but this doesn't mean we should explicitely ignore other EXIT_XXX
states.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- 2.6.18-rc4/kernel/futex.c~1_zomb	2006-08-21 18:45:43.000000000 +0400
+++ 2.6.18-rc4/kernel/futex.c	2006-08-21 20:32:48.000000000 +0400
@@ -397,7 +397,7 @@ static struct task_struct * futex_find_g
 		p = NULL;
 		goto out_unlock;
 	}
-	if (p->state == EXIT_ZOMBIE || p->exit_state == EXIT_ZOMBIE) {
+	if (p->exit_state != 0) {
 		p = NULL;
 		goto out_unlock;
 	}

-
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