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hrtimer: Provide hrtimer_sleeper_start_expires()

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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: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2019-07-30 21:03:53 +02:00
parent dbc1625fc9
commit 01656464fc
2 changed files with 20 additions and 2 deletions
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3
include/linux/hrtimer.h
View File

@ -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);

19
kernel/time/hrtimer.c
View File

@ -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();