kernel/sched/deadline.c

2387 	struct task_struct *next_task;
2391 	next_task = pick_next_pushable_dl_task(rq);
2392 	if (!next_task)
2397 	 * If next_task preempts rq->curr, and rq->curr
2399 	 * without going further in pushing next_task.
2402 	    dl_time_before(next_task->dl.deadline, rq->curr->dl.deadline) &&
2408 	if (is_migration_disabled(next_task))
2411 	if (WARN_ON(next_task == rq->curr))
2415 	get_task_struct(next_task);
2418 	later_rq = find_lock_later_rq(next_task, rq);
2425 		 * then possible that next_task has migrated.
2428 		if (task == next_task) {
2440 		put_task_struct(next_task);
2441 		next_task = task;
2445 	deactivate_task(rq, next_task, 0);
2446 	set_task_cpu(next_task, later_rq->cpu);
2447 	activate_task(later_rq, next_task, 0);
2455 	put_task_struct(next_task);