1 files changed, 22 insertions, 25 deletions

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index b4b6abc81e4a..ca9191ced4b5 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -86,38 +86,35 @@ static void tick_do_update_jiffies64(ktime_t now)
 
 	/* Reevaluate with jiffies_lock held */
 	raw_spin_lock(&jiffies_lock);
+	if (ktime_before(now, tick_next_period)) {
+		raw_spin_unlock(&jiffies_lock);
+		return;
+	}
+
 	write_seqcount_begin(&jiffies_seq);
 
-	delta = ktime_sub(now, last_jiffies_update);
-	if (delta >= tick_period) {
+	last_jiffies_update = ktime_add(last_jiffies_update, tick_period);
 
-		delta = ktime_sub(delta, tick_period);
-		last_jiffies_update = ktime_add(last_jiffies_update,
-						tick_period);
+	delta = ktime_sub(now, tick_next_period);
+	if (unlikely(delta >= tick_period)) {
+		/* Slow path for long idle sleep times */
+		s64 incr = ktime_to_ns(tick_period);
 
-		/* Slow path for long timeouts */
-		if (unlikely(delta >= tick_period)) {
-			s64 incr = ktime_to_ns(tick_period);
+		ticks = ktime_divns(delta, incr);
 
-			ticks = ktime_divns(delta, incr);
+		last_jiffies_update = ktime_add_ns(last_jiffies_update,
+						   incr * ticks);
+	}
 
-			last_jiffies_update = ktime_add_ns(last_jiffies_update,
-							   incr * ticks);
-		}
-		do_timer(++ticks);
+	do_timer(++ticks);
+
+	/*
+	 * Keep the tick_next_period variable up to date.  WRITE_ONCE()
+	 * pairs with the READ_ONCE() in the lockless quick check above.
+	 */
+	WRITE_ONCE(tick_next_period,
+		   ktime_add(last_jiffies_update, tick_period));
 
-		/*
-		 * Keep the tick_next_period variable up to date.
-		 * WRITE_ONCE() pairs with the READ_ONCE() in the lockless
-		 * quick check above.
-		 */
-		WRITE_ONCE(tick_next_period,
-			   ktime_add(last_jiffies_update, tick_period));
-	} else {
-		write_seqcount_end(&jiffies_seq);
-		raw_spin_unlock(&jiffies_lock);
-		return;
-	}
 	write_seqcount_end(&jiffies_seq);
 	raw_spin_unlock(&jiffies_lock);
 	update_wall_time();