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-rw-r--r--arch/s390/kernel/vtime.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/s390/kernel/vtime.c b/arch/s390/kernel/vtime.c
index b59a812a010e..3479f1b0d4e0 100644
--- a/arch/s390/kernel/vtime.c
+++ b/arch/s390/kernel/vtime.c
@@ -121,32 +121,35 @@ void account_system_vtime(struct task_struct *tsk)
}
EXPORT_SYMBOL_GPL(account_system_vtime);
-void vtime_start_cpu(void)
+void vtime_start_cpu(__u64 int_clock, __u64 enter_timer)
{
struct s390_idle_data *idle = &__get_cpu_var(s390_idle);
struct vtimer_queue *vq = &__get_cpu_var(virt_cpu_timer);
__u64 idle_time, expires;
+ if (idle->idle_enter == 0ULL)
+ return;
+
/* Account time spent with enabled wait psw loaded as idle time. */
- idle_time = S390_lowcore.int_clock - idle->idle_enter;
+ idle_time = int_clock - idle->idle_enter;
account_idle_time(idle_time);
S390_lowcore.steal_timer +=
idle->idle_enter - S390_lowcore.last_update_clock;
- S390_lowcore.last_update_clock = S390_lowcore.int_clock;
+ S390_lowcore.last_update_clock = int_clock;
/* Account system time spent going idle. */
S390_lowcore.system_timer += S390_lowcore.last_update_timer - vq->idle;
- S390_lowcore.last_update_timer = S390_lowcore.async_enter_timer;
+ S390_lowcore.last_update_timer = enter_timer;
/* Restart vtime CPU timer */
if (vq->do_spt) {
/* Program old expire value but first save progress. */
- expires = vq->idle - S390_lowcore.async_enter_timer;
+ expires = vq->idle - enter_timer;
expires += get_vtimer();
set_vtimer(expires);
} else {
/* Don't account the CPU timer delta while the cpu was idle. */
- vq->elapsed -= vq->idle - S390_lowcore.async_enter_timer;
+ vq->elapsed -= vq->idle - enter_timer;
}
idle->sequence++;