[patch] s390: exploit rcu_soon_pending() interface
From: Heiko Carstens
Date: Mon Apr 24 2006 - 07:18:44 EST
From: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Exploit rcu_soon_pending() interface to keep the cpu 'ticking'.
Signed-off-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
---
arch/s390/kernel/time.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index fea043b..1c06c9c 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -249,18 +249,20 @@ 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_pending(cpu) || rcu_soon_pending(cpu) ||
+ local_softirq_pending()) {
+ cpu_clear(cpu, nohz_cpu_mask);
return;
}
-
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