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softlockup: use cpu_clock() instead of sched_clock()

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patch a3b13c23f1 in mainline.

sched_clock() is not a reliable time-source, use cpu_clock() instead.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ingo Molnar
2007-10-16 23:26:06 -07:00
committed by Greg Kroah-Hartman
parent 00aceb500c
commit fd5ec14e72
1 changed files with 6 additions and 4 deletions
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kernel/softlockup.c
+6 -4
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@@ -43,14 +43,16 @@ static struct notifier_block panic_block = {
* resolution, and we don't need to waste time with a big divide when
* 2^30ns == 1.074s.
*/
static unsigned long get_timestamp(void)
static unsigned long get_timestamp(int this_cpu)
{
return sched_clock() >> 30; /* 2^30 ~= 10^9 */
return cpu_clock(this_cpu) >> 30; /* 2^30 ~= 10^9 */
}
void touch_softlockup_watchdog(void)
{
__raw_get_cpu_var(touch_timestamp) = get_timestamp();
int this_cpu = raw_smp_processor_id();
__raw_get_cpu_var(touch_timestamp) = get_timestamp(this_cpu);
}
EXPORT_SYMBOL(touch_softlockup_watchdog);
@@ -96,7 +98,7 @@ void softlockup_tick(void)
return;
}
now = get_timestamp();
now = get_timestamp(this_cpu);
/* Wake up the high-prio watchdog task every second: */
if (now > (touch_timestamp + 1))