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[PATCH] s390: exploit rcu_needs_cpu() interface 

Exploit rcu_needs_cpu() interface to keep the cpu 'ticking' if necessary.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Heiko Carstens 2006-05-15 09:43:59 -07:00 committed by Linus Torvalds
parent 986733e01d
commit 5afdbd6e84
1 changed files with 4 additions and 3 deletions
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7
arch/s390/kernel/time.c
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@ -249,18 +249,19 @@ static inline void stop_hz_timer(void)
unsigned long flags;
unsigned long seq, next;
__u64 timer, todval;
int cpu = smp_processor_id();
if (sysctl_hz_timer != 0)
return;
cpu_set(smp_processor_id(), nohz_cpu_mask);
cpu_set(cpu, nohz_cpu_mask);
/*
* Leave the clock comparator set up for the next timer
* tick if either rcu or a softirq is pending.
*/
if (rcu_pending(smp_processor_id()) || local_softirq_pending()) {
cpu_clear(smp_processor_id(), nohz_cpu_mask);
if (rcu_needs_cpu(cpu) || local_softirq_pending()) {
cpu_clear(cpu, nohz_cpu_mask);
return;
}