linux-kernel - [PATCH] sched: Fix incorrect sanity check

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Message-ID: <1264088067.4283.1172.camel@laptop>
Date:	Thu, 21 Jan 2010 16:34:27 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"heiko.carstens" <heiko.carstens@...ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] sched: Fix incorrect sanity check

We moved to migrate on wakeup, which means that sleeping tasks could
still be present on offline cpus. Amend the check to only test running
tasks.

Reported-by: Heiko Carstens <heiko.carstens@...ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 cpu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/kernel/cpu.c
===================================================================
--- linux-2.6.orig/kernel/cpu.c
+++ linux-2.6/kernel/cpu.c
@@ -151,7 +151,7 @@ static inline void check_for_tasks(int c
 
 	write_lock_irq(&tasklist_lock);
 	for_each_process(p) {
-		if (task_cpu(p) == cpu &&
+		if (task_cpu(p) == cpu && p->state == TASK_RUNNING &&
 		    (!cputime_eq(p->utime, cputime_zero) ||
 		     !cputime_eq(p->stime, cputime_zero)))
 			printk(KERN_WARNING "Task %s (pid = %d) is on cpu %d\


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