On Mon, May 19, 2014 at 11:31:19PM +0400, Kirill Tkhai wrote:
> @@ -513,9 +513,17 @@ static enum hrtimer_restart dl_task_timer(struct hrtimer *timer)
> struct sched_dl_entity,
> dl_timer);
> struct task_struct *p = dl_task_of(dl_se);
> - struct rq *rq = task_rq(p);
> + struct rq *rq;
> +again:
> + rq = task_rq(p);
> raw_spin_lock(&rq->lock);
>
> + if (unlikely(rq != task_rq(p))) {
> + /* Task was moved, retrying. */
> + raw_spin_unlock(&rq->lock);
> + goto again;
> + }
> +
That thing is called: rq = __task_rq_lock(p);
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