linux-kernel - [PATCH 2/3] wait_task_inactive: fix the !CONFIG

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Message-ID: <20080730170948.GA18679@tv-sign.ru>
Date:	Wed, 30 Jul 2008 21:09:48 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] wait_task_inactive: fix the !CONFIG_SMP version

The semantics of wait_task_inactive() was changed, update the !SMP
version accordingly.

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

--- 27/include/linux/sched.h~2_WTI_DUMMY	2008-07-30 13:12:48.000000000 +0400
+++ 27/include/linux/sched.h	2008-07-30 20:28:31.000000000 +0400
@@ -1880,7 +1880,9 @@ extern unsigned long wait_task_inactive(
 static inline unsigned long wait_task_inactive(struct task_struct *p,
 					       long match_state)
 {
-	return 1;
+	if (match_state && unlikely(p->state != match_state))
+		return 0;
+	return p->nvcsw | LONG_MIN; /* sets MSB */
 }
 #endif
 

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