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[PATCH] s390: idle timer setup

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Fix overflow in calculation of the new tod value in stop_hz_timer and fix
wrong virtual timer list idle time in case the virtual timer is already
expired in stop_cpu_timer.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Martin Schwidefsky
2005-05-01 08:58:57 -07:00
committed by Linus Torvalds
parent b2c6678c85
commit 4b7e070662
2 changed files with 22 additions and 15 deletions
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12
arch/s390/kernel/time.c
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@@ -244,7 +244,7 @@ int sysctl_hz_timer = 1;
*/
static inline void stop_hz_timer(void)
{
__u64 timer;
__u64 timer, todval;
if (sysctl_hz_timer != 0)
return;
@@ -265,8 +265,14 @@ static inline void stop_hz_timer(void)
* for the next event.
*/
timer = (__u64) (next_timer_interrupt() - jiffies) + jiffies_64;
timer = jiffies_timer_cc + timer * CLK_TICKS_PER_JIFFY;
asm volatile ("SCKC %0" : : "m" (timer));
todval = -1ULL;
/* Be careful about overflows. */
if (timer < (-1ULL / CLK_TICKS_PER_JIFFY)) {
timer = jiffies_timer_cc + timer * CLK_TICKS_PER_JIFFY;
if (timer >= jiffies_timer_cc)
todval = timer;
}
asm volatile ("SCKC %0" : : "m" (todval));
}
/*