From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 2 Feb 2011 12:19:48 +0000 (+0100)
Subject: sched: Fix update_curr_rt()
X-Git-Tag: v2.6.37.1~86
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1cdc65e1400d863f28af868ee1e645485b04f5ed;p=pandora-kernel.git

sched: Fix update_curr_rt()

commit 06c3bc655697b19521901f9254eb0bbb2c67e7e8 upstream.

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@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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