From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: "heiko.carstens" <heiko.carstens@de.ibm.com>,
Gautham R Shenoy <ego@in.ibm.com>,
lkml <linux-kernel@vger.kernel.org>
Subject: [PATCH] sched: Fix incorrect sanity check
Date: Thu, 21 Jan 2010 16:34:27 +0100 [thread overview]
Message-ID: <1264088067.4283.1172.camel@laptop> (raw)
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@de.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.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\
reply other threads:[~2010-01-21 15:34 UTC|newest]
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