2 * idle-task scheduling class.
4 * (NOTE: these are not related to SCHED_IDLE tasks which are
5 * handled in sched_fair.c)
10 select_task_rq_idle(struct task_struct *p, int sd_flag, int flags)
12 return task_cpu(p); /* IDLE tasks as never migrated */
14 #endif /* CONFIG_SMP */
16 * Idle tasks are unconditionally rescheduled:
18 static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int flags)
20 resched_task(rq->idle);
23 static struct task_struct *pick_next_task_idle(struct rq *rq)
25 schedstat_inc(rq, sched_goidle);
30 * It is not legal to sleep in the idle task - print a warning
31 * message if some code attempts to do it:
34 dequeue_task_idle(struct rq *rq, struct task_struct *p, int flags)
36 raw_spin_unlock_irq(&rq->lock);
37 printk(KERN_ERR "bad: scheduling from the idle thread!\n");
39 raw_spin_lock_irq(&rq->lock);
42 static void put_prev_task_idle(struct rq *rq, struct task_struct *prev)
46 static void task_tick_idle(struct rq *rq, struct task_struct *curr, int queued)
50 static void set_curr_task_idle(struct rq *rq)
54 static void switched_to_idle(struct rq *rq, struct task_struct *p)
60 prio_changed_idle(struct rq *rq, struct task_struct *p, int oldprio)
65 static unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task)
71 * Simple, special scheduling class for the per-CPU idle tasks:
73 static const struct sched_class idle_sched_class = {
75 /* no enqueue/yield_task for idle tasks */
77 /* dequeue is not valid, we print a debug message there: */
78 .dequeue_task = dequeue_task_idle,
80 .check_preempt_curr = check_preempt_curr_idle,
82 .pick_next_task = pick_next_task_idle,
83 .put_prev_task = put_prev_task_idle,
86 .select_task_rq = select_task_rq_idle,
89 .set_curr_task = set_curr_task_idle,
90 .task_tick = task_tick_idle,
92 .get_rr_interval = get_rr_interval_idle,
94 .prio_changed = prio_changed_idle,
95 .switched_to = switched_to_idle,