[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>

diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index fea043b..029f099 100644 (file)
--- 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;
        }