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sched: remove activate_idle_task()

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cpu_down() code is ok wrt sched_idle_next() placing the 'idle' task not
at the beginning of the queue.

So get rid of activate_idle_task() and make use of activate_task() instead.
It is the same as activate_task(), except for the update_rq_clock(rq) call
that is redundant.

Code size goes down:

   text    data     bss     dec     hex filename
  47853    3934     336   52123    cb9b sched.o.before
  47828    3934     336   52098    cb82 sched.o.after

Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dmitry Adamushko 2007-11-15 20:57:40 +01:00 committed by Ingo Molnar
parent ce96b5ac74
commit 94bc9a7bd9
1 changed files with 4 additions and 18 deletions
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22
kernel/sched.c
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@ -5281,24 +5281,10 @@ static void migrate_live_tasks(int src_cpu)
read_unlock(&tasklist_lock);
}
/*
* activate_idle_task - move idle task to the _front_ of runqueue.
*/
static void activate_idle_task(struct task_struct *p, struct rq *rq)
{
update_rq_clock(rq);
if (p->state == TASK_UNINTERRUPTIBLE)
rq->nr_uninterruptible--;
enqueue_task(rq, p, 0);
inc_nr_running(p, rq);
}
/*
* Schedules idle task to be the next runnable task on current CPU.
* It does so by boosting its priority to highest possible and adding it to
* the _front_ of the runqueue. Used by CPU offline code.
* It does so by boosting its priority to highest possible.
* Used by CPU offline code.
*/
void sched_idle_next(void)
{
@ -5318,8 +5304,8 @@ void sched_idle_next(void)
__setscheduler(rq, p, SCHED_FIFO, MAX_RT_PRIO-1);
/* Add idle task to the _front_ of its priority queue: */
activate_idle_task(p, rq);
update_rq_clock(rq);
activate_task(rq, p, 0);
spin_unlock_irqrestore(&rq->lock, flags);
}