[PATCH] improve precision of idle time detection.

Increase the precision of the idle time calculation that is exported
to user space via /sys/devices/system/cpu/cpu<x>/idle_time_us

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index 1254a4d0d762..25d21fef76ba 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -112,6 +112,7 @@ EXPORT_SYMBOL_GPL(account_system_vtime);
 
 static inline void set_vtimer(__u64 expires)
 {
+        struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);
         __u64 timer;
 
         asm volatile ("  STPT %0\n"  /* Store current cpu timer value */
@@ -121,7 +122,7 @@ static inline void set_vtimer(__u64 expires)
         S390_lowcore.last_update_timer = expires;
 
         /* store expire time for this CPU timer */
-        __get_cpu_var(virt_cpu_timer).to_expire = expires;
+        vq->to_expire = expires;
 }
 
 void vtime_start_cpu_timer(void)