2.6.23-stable review patch. If anyone has any objections, please let us
know.
------------------
From: Ingo Molnar <[EMAIL PROTECTED]>
patch a3b13c23f186ecb57204580cc1f2dbe9c284953a in mainline.
sched_clock() is not a reliable time-source, use cpu_clock() instead.
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
kernel/softlockup.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -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))
--
-
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