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Commit c24d20db authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: move around resched_task() 



move resched_task()/resched_cpu() into the 'public interfaces'
section of sched.c, for use by kernel/sched_fair/rt/idletask.c

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 62480d13

kernel/sched.c

+52 −52
Original line number Diff line number Diff line
@@ -617,6 +617,58 @@ static inline struct rq *this_rq_lock(void) 
	return rq;

}



/*

 * resched_task - mark a task 'to be rescheduled now'.

 *

 * On UP this means the setting of the need_resched flag, on SMP it

 * might also involve a cross-CPU call to trigger the scheduler on

 * the target CPU.

 */

#ifdef CONFIG_SMP



#ifndef tsk_is_polling

#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)

#endif



static void resched_task(struct task_struct *p)

{

	int cpu;



	assert_spin_locked(&task_rq(p)->lock);



	if (unlikely(test_tsk_thread_flag(p, TIF_NEED_RESCHED)))

		return;



	set_tsk_thread_flag(p, TIF_NEED_RESCHED);



	cpu = task_cpu(p);

	if (cpu == smp_processor_id())

		return;



	/* NEED_RESCHED must be visible before we test polling */

	smp_mb();

	if (!tsk_is_polling(p))

		smp_send_reschedule(cpu);

}



static void resched_cpu(int cpu)

{

	struct rq *rq = cpu_rq(cpu);

	unsigned long flags;



	if (!spin_trylock_irqsave(&rq->lock, flags))

		return;

	resched_task(cpu_curr(cpu));

	spin_unlock_irqrestore(&rq->lock, flags);

}

#else

static inline void resched_task(struct task_struct *p)

{

	assert_spin_locked(&task_rq(p)->lock);

	set_tsk_need_resched(p);

}

#endif



#include "sched_stats.h"



/*
@@ -953,58 +1005,6 @@ static void deactivate_task(struct task_struct *p, struct rq *rq) 
	p->array = NULL;

}



/*

 * resched_task - mark a task 'to be rescheduled now'.

 *

 * On UP this means the setting of the need_resched flag, on SMP it

 * might also involve a cross-CPU call to trigger the scheduler on

 * the target CPU.

 */

#ifdef CONFIG_SMP



#ifndef tsk_is_polling

#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)

#endif



static void resched_task(struct task_struct *p)

{

	int cpu;



	assert_spin_locked(&task_rq(p)->lock);



	if (unlikely(test_tsk_thread_flag(p, TIF_NEED_RESCHED)))

		return;



	set_tsk_thread_flag(p, TIF_NEED_RESCHED);



	cpu = task_cpu(p);

	if (cpu == smp_processor_id())

		return;



	/* NEED_RESCHED must be visible before we test polling */

	smp_mb();

	if (!tsk_is_polling(p))

		smp_send_reschedule(cpu);

}



static void resched_cpu(int cpu)

{

	struct rq *rq = cpu_rq(cpu);

	unsigned long flags;



	if (!spin_trylock_irqsave(&rq->lock, flags))

		return;

	resched_task(cpu_curr(cpu));

	spin_unlock_irqrestore(&rq->lock, flags);

}

#else

static inline void resched_task(struct task_struct *p)

{

	assert_spin_locked(&task_rq(p)->lock);

	set_tsk_need_resched(p);

}

#endif



/**

 * task_curr - is this task currently executing on a CPU?

 * @p: the task in question.