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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-05-15 09:43:59 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-05-15 11:20:55 -0700
commit5afdbd6e84c7fbdaa7cfde4cbee0d3a5f4f56da2 (patch)
tree9b4c317054b833245372f0c0e64b015469825479
parent986733e01d258c26107f1da9d8d47c718349ad2f (diff)
downloadlinux-5afdbd6e84c7fbdaa7cfde4cbee0d3a5f4f56da2.tar.gz
[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>
-rw-r--r--arch/s390/kernel/time.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index fea043b69b9..029f09901b8 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -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;
}