sched_idle_rq
int busy = idle != CPU_IDLE && !sched_idle_rq(rq);
busy = !idle && !sched_idle_rq(rq);
return sched_idle_rq(rq) && !task_has_idle_policy(p);
bool was_sched_idle = sched_idle_rq(rq);
if (unlikely(!was_sched_idle && sched_idle_rq(rq)))