Re: [patch V2 sched: Protect sched_rr_get_param access totask->sched_class

[Peter Zijlstra]

On Wed, 2009-12-09 at 09:32 +0100, Thomas Gleixner wrote:
> sched_rr_get_param calls task->sched_class->get_rr_interval(task)
> without protection against a concurrent sched_setscheduler() call
> which modifies task->sched_class.
> 
> Serialize the access with task_rq_lock(task) and hand the rq pointer
> into get_rr_interval() as it's needed at least in the sched_fair
> implementation.
> 
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>

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