dequeue_entities
dequeue_entities(rq, se, DEQUEUE_SLEEP | DEQUEUE_DELAYED);
static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags);
dequeue_entities(rq, se, DEQUEUE_SLEEP | DEQUEUE_DELAYED);
if (dequeue_entities(rq, &p->se, flags) < 0)
dequeue_entities(rq, se, DEQUEUE_SLEEP | DEQUEUE_DELAYED);