[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>

1 files changed, 4 insertions, 3 deletions

diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index fea043b69b91..029f09901b85 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;
         }