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Commit 01656464 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

hrtimer: Provide hrtimer_sleeper_start_expires() 



hrtimer_sleepers will gain a scheduling class dependent treatment on
PREEMPT_RT. Create a wrapper around hrtimer_start_expires() to make that
possible.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent dbc1625f

include/linux/hrtimer.h

+3 −0
Original line number Diff line number Diff line
@@ -408,6 +408,9 @@ static inline void hrtimer_start_expires(struct hrtimer *timer, 
	hrtimer_start_range_ns(timer, soft, delta, mode);

}



void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl,

				   enum hrtimer_mode mode);



static inline void hrtimer_restart(struct hrtimer *timer)

{

	hrtimer_start_expires(timer, HRTIMER_MODE_ABS);

kernel/time/hrtimer.c

+17 −2
Original line number Diff line number Diff line
@@ -1650,6 +1650,21 @@ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer) 
	return HRTIMER_NORESTART;

}



/**

 * hrtimer_sleeper_start_expires - Start a hrtimer sleeper timer

 * @sl:		sleeper to be started

 * @mode:	timer mode abs/rel

 *

 * Wrapper around hrtimer_start_expires() for hrtimer_sleeper based timers

 * to allow PREEMPT_RT to tweak the delivery mode (soft/hardirq context)

 */

void hrtimer_sleeper_start_expires(struct hrtimer_sleeper *sl,

				   enum hrtimer_mode mode)

{

	hrtimer_start_expires(&sl->timer, mode);

}

EXPORT_SYMBOL_GPL(hrtimer_sleeper_start_expires);



static void __hrtimer_init_sleeper(struct hrtimer_sleeper *sl,

				   clockid_t clock_id, enum hrtimer_mode mode)

{
@@ -1698,7 +1713,7 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod 


	do {

		set_current_state(TASK_INTERRUPTIBLE);

		hrtimer_start_expires(&t->timer, mode);

		hrtimer_sleeper_start_expires(t, mode);



		if (likely(t->task))

			freezable_schedule();
@@ -1953,7 +1968,7 @@ schedule_hrtimeout_range_clock(ktime_t *expires, u64 delta, 


	hrtimer_init_sleeper_on_stack(&t, clock_id, mode);

	hrtimer_set_expires_range_ns(&t.timer, *expires, delta);

	hrtimer_start_expires(&t.timer, mode);

	hrtimer_sleeper_start_expires(&t, mode);



	if (likely(t.task))

		schedule();