From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: [PATCH RT 4/6] sched: Check for idle task in might_sleep() Date: Wed, 06 Feb 2013 16:58:22 -0500 Message-ID: <20130206215915.514847412@goodmis.org> References: <20130206215818.969089606@goodmis.org> Cc: Thomas Gleixner , Carsten Emde , John Kacur , To: linux-kernel@vger.kernel.org, linux-rt-users Return-path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:4312 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758233Ab3BFV7S (ORCPT ); Wed, 6 Feb 2013 16:59:18 -0500 Content-Disposition: inline; filename=0004-sched-Check-for-idle-task-in-might_sleep.patch Sender: linux-rt-users-owner@vger.kernel.org List-ID: From: Thomas Gleixner Idle is not allowed to call sleeping functions ever! Cc: stable-rt@vger.kernel.org Signed-off-by: Thomas Gleixner Signed-off-by: Steven Rostedt --- kernel/sched/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index e979551..751ec60 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -7536,7 +7536,8 @@ void __might_sleep(const char *file, int line, int preempt_offset) static unsigned long prev_jiffy; /* ratelimiting */ rcu_sleep_check(); /* WARN_ON_ONCE() by default, no rate limit reqd. */ - if ((preempt_count_equals(preempt_offset) && !irqs_disabled()) || + if ((preempt_count_equals(preempt_offset) && !irqs_disabled() && + !is_idle_task(current)) || system_state != SYSTEM_RUNNING || oops_in_progress) return; if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy) -- 1.7.10.4