#include "sched.h" /* * idle-task scheduling class. * * (NOTE: these are not related to SCHED_IDLE tasks which are *  handled in sched/fair.c) */ #ifdef CONFIG_SMPstatic intselect_task_rq_idle(struct task_struct *p, int cpu, int sd_flag, int flags){	return task_cpu(p); /* IDLE tasks as never migrated */}#endif /* CONFIG_SMP */ /* * Idle tasks are unconditionally rescheduled: */static void check_preempt_curr_idle(struct rq *rq, struct task_struct *p, int flags){	resched_curr(rq);} static struct task_struct *pick_next_task_idle(struct rq *rq, struct task_struct *prev, struct rq_flags *rf){	put_prev_task(rq, prev);	update_idle_core(rq);	schedstat_inc(rq->sched_goidle);	return rq->idle;} /* * It is not legal to sleep in the idle task - print a warning * message if some code attempts to do it: */static voiddequeue_task_idle(struct rq *rq, struct task_struct *p, int flags){	raw_spin_unlock_irq(&rq->lock);	printk(KERN_ERR "bad: scheduling from the idle thread!\n");	dump_stack();	raw_spin_lock_irq(&rq->lock);} static void put_prev_task_idle(struct rq *rq, struct task_struct *prev){	rq_last_tick_reset(rq);} static void task_tick_idle(struct rq *rq, struct task_struct *curr, int queued){} static void set_curr_task_idle(struct rq *rq){} static void switched_to_idle(struct rq *rq, struct task_struct *p){	BUG();} static voidprio_changed_idle(struct rq *rq, struct task_struct *p, int oldprio){	BUG();} static unsigned int get_rr_interval_idle(struct rq *rq, struct task_struct *task){	return 0;} static void update_curr_idle(struct rq *rq){} /* * Simple, special scheduling class for the per-CPU idle tasks: */const struct sched_class idle_sched_class = {	/* .next is NULL */	/* no enqueue/yield_task for idle tasks */ 	/* dequeue is not valid, we print a debug message there: */	.dequeue_task		= dequeue_task_idle, 	.check_preempt_curr	= check_preempt_curr_idle, 	.pick_next_task		= pick_next_task_idle,	.put_prev_task		= put_prev_task_idle, #ifdef CONFIG_SMP	.select_task_rq		= select_task_rq_idle,	.set_cpus_allowed	= set_cpus_allowed_common,#endif 	.set_curr_task          = set_curr_task_idle,	.task_tick		= task_tick_idle, 	.get_rr_interval	= get_rr_interval_idle, 	.prio_changed		= prio_changed_idle,	.switched_to		= switched_to_idle,	.update_curr		= update_curr_idle,};