linux-kernel - [tip:sched/urgent] sched: Fix update_curr

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Message-ID: <tip-06c3bc655697b19521901f9254eb0bbb2c67e7e8@git.kernel.org>
Date:	Thu, 3 Feb 2011 14:11:10 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/urgent] sched: Fix update_curr_rt()

Commit-ID:  06c3bc655697b19521901f9254eb0bbb2c67e7e8
Gitweb:     http://git.kernel.org/tip/06c3bc655697b19521901f9254eb0bbb2c67e7e8
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 2 Feb 2011 13:19:48 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 3 Feb 2011 12:21:33 +0100

sched: Fix update_curr_rt()

cpu_stopper_thread()
  migration_cpu_stop()
    __migrate_task()
      deactivate_task()
        dequeue_task()
          dequeue_task_rq()
            update_curr_rt()

Will call update_curr_rt() on rq->curr, which at that time is
rq->stop. The problem is that rq->stop.prio matches an RT prio and
thus falsely assumes its a rt_sched_class task.

Reported-Debuged-Tested-Acked-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <new-submission>
Cc: stable@...nel.org # .37
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_rt.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index c914ec7..ad62677 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -625,7 +625,7 @@ static void update_curr_rt(struct rq *rq)
 	struct rt_rq *rt_rq = rt_rq_of_se(rt_se);
 	u64 delta_exec;
 
-	if (!task_has_rt_policy(curr))
+	if (curr->sched_class != &rt_sched_class)
 		return;
 
 	delta_exec = rq->clock_task - curr->se.exec_start;
--
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