[PATCH]sched/stop_task: Do not account zero delta_exec in put_prev_task_stop

[Kirill Tkhai <tkhai@yandex.ru>]

Simple return

Signed-off-by: Kirill V Tkhai <tkhai@yandex.ru>
CC: Steven Rostedt <rostedt@goodmis.org>
CC: Ingo Molnar <mingo@kernel.org>
CC: Peter Zijlstra <peterz@infradead.org>
CC: linux-rt-users <linux-rt-users@vger.kernel.org>
---
 kernel/sched/stop_task.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index da5eb5b..78d0458 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -58,8 +58,8 @@ static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
 	u64 delta_exec;
 
 	delta_exec = rq->clock_task - curr->se.exec_start;
-	if (unlikely((s64)delta_exec < 0))
-		delta_exec = 0;
+	if (unlikely((s64)delta_exec <= 0))
+		return;
 
 	schedstat_set(curr->se.statistics.exec_max,
 			max(curr->se.statistics.exec_max, delta_exec));