#include "sched.h" /* * stop-task scheduling class. * * The stop task is the highest priority task in the system, it preempts * everything and will be preempted by nothing. * * See kernel/stop_machine.c */ #ifdef CONFIG_SMPstatic intselect_task_rq_stop(struct task_struct *p, int sd_flag, int flags){	return task_cpu(p); /* stop tasks as never migrate */}#endif /* CONFIG_SMP */ static voidcheck_preempt_curr_stop(struct rq *rq, struct task_struct *p, int flags){	/* we're never preempted */} static struct task_struct *pick_next_task_stop(struct rq *rq){	struct task_struct *stop = rq->stop; 	if (stop && stop->on_rq)		return stop; 	return NULL;} static voidenqueue_task_stop(struct rq *rq, struct task_struct *p, int flags){	inc_nr_running(rq);} static voiddequeue_task_stop(struct rq *rq, struct task_struct *p, int flags){	dec_nr_running(rq);} static void yield_task_stop(struct rq *rq){	BUG(); /* the stop task should never yield, its pointless. */} static void put_prev_task_stop(struct rq *rq, struct task_struct *prev){} static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued){} static void set_curr_task_stop(struct rq *rq){} static void switched_to_stop(struct rq *rq, struct task_struct *p){	BUG(); /* its impossible to change to this class */} static voidprio_changed_stop(struct rq *rq, struct task_struct *p, int oldprio){	BUG(); /* how!?, what priority? */} static unsigned intget_rr_interval_stop(struct rq *rq, struct task_struct *task){	return 0;} /* * Simple, special scheduling class for the per-CPU stop tasks: */const struct sched_class stop_sched_class = {	.next			= &rt_sched_class, 	.enqueue_task		= enqueue_task_stop,	.dequeue_task		= dequeue_task_stop,	.yield_task		= yield_task_stop, 	.check_preempt_curr	= check_preempt_curr_stop, 	.pick_next_task		= pick_next_task_stop,	.put_prev_task		= put_prev_task_stop, #ifdef CONFIG_SMP	.select_task_rq		= select_task_rq_stop,#endif 	.set_curr_task          = set_curr_task_stop,	.task_tick		= task_tick_stop, 	.get_rr_interval	= get_rr_interval_stop, 	.prio_changed		= prio_changed_stop,	.switched_to		= switched_to_stop,};