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[hrtimer] Enforce resolution as lower limit of intervals

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Roman Zippel pointed out that the missing lower limit of intervals
leads to an accounting error in the overrun count. Enforce the lower
limit of intervals to resolution in the timer forwarding code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2006-01-12 11:47:34 +01:00
parent e2787630c1
commit c9db4fa115
2 changed files with 5 additions and 3 deletions
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3
include/linux/hrtimer.h
View file

@ -122,8 +122,7 @@ static inline int hrtimer_active(const struct hrtimer *timer)
}
/* Forward a hrtimer so it expires after now: */
extern unsigned long hrtimer_forward(struct hrtimer *timer,
const ktime_t interval);
extern unsigned long hrtimer_forward(struct hrtimer *timer, ktime_t interval);
/* Precise sleep: */
extern long hrtimer_nanosleep(struct timespec *rqtp,

5
kernel/hrtimer.c
View file

@ -275,7 +275,7 @@ void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
* The number of overruns is added to the overrun field.
*/
unsigned long
hrtimer_forward(struct hrtimer *timer, const ktime_t interval)
hrtimer_forward(struct hrtimer *timer, ktime_t interval)
{
unsigned long orun = 1;
ktime_t delta, now;
@ -287,6 +287,9 @@ hrtimer_forward(struct hrtimer *timer, const ktime_t interval)
if (delta.tv64 < 0)
return 0;
if (interval.tv64 < timer->base->resolution.tv64)
interval.tv64 = timer->base->resolution.tv64;
if (unlikely(delta.tv64 >= interval.tv64)) {
nsec_t incr = ktime_to_ns(interval);