sched: Fold updating of the last_update_time_info into update_ts_time_stats()

This patch folds the updating of the last_update_time into the
update_ts_time_stats() function, and updates the callers.

This allows for further cleanups that are done in the next
patch.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: davej@redhat.com
LKML-Reference: <20100509082403.60072967@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/time/tick-sched.c

@@ -153,7 +153,8 @@ static void tick_nohz_update_jiffies(ktime_t now)
 /*
  * Updates the per cpu time idle statistics counters
  */
-static void update_ts_time_stats(struct tick_sched *ts, ktime_t now)
+static void
+update_ts_time_stats(struct tick_sched *ts, ktime_t now, u64 *last_update_time)
 {
 	ktime_t delta;
 
@@ -163,13 +164,19 @@ static void update_ts_time_stats(struct tick_sched *ts, ktime_t now)
 		ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
 		ts->idle_entrytime = now;
 	}
+
+	if (ts->idle_active && last_update_time)
+		*last_update_time = ktime_to_us(ts->idle_lastupdate);
+	else
+		*last_update_time = ktime_to_us(now);
+
 }
 
 static void tick_nohz_stop_idle(int cpu, ktime_t now)
 {
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
 
-	update_ts_time_stats(ts, now);
+	update_ts_time_stats(ts, now, NULL);
 	ts->idle_active = 0;
 
 	sched_clock_idle_wakeup_event(0);
@@ -181,7 +188,7 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
 
 	now = ktime_get();
 
-	update_ts_time_stats(ts, now);
+	update_ts_time_stats(ts, now, NULL);
 
 	ts->idle_entrytime = now;
 	ts->idle_active = 1;
@@ -206,18 +213,11 @@ static ktime_t tick_nohz_start_idle(struct tick_sched *ts)
 u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
 {
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
-	ktime_t now;
 
 	if (!tick_nohz_enabled)
 		return -1;
 
-	now = ktime_get();
-	update_ts_time_stats(ts, now);
-
-	if (ts->idle_active)
-		*last_update_time = ktime_to_us(ts->idle_lastupdate);
-	else
-		*last_update_time = ktime_to_us(now);
+	update_ts_time_stats(ts, ktime_get(), last_update_time);
 
 	return ktime_to_us(ts->idle_sleeptime);
 }