[PATCH] sched/rt: Remove unnecessary check for next_task in push_rt_task()

[Muchun Song]

In push_rt_task(), we call pick_next_pushable_task() to pick
next_task before the check. If next_task and rq->curr are equal,
which will trigger BUG_ON() in pick_next_pushable_task(). See
the following code in pick_next_pushable_task().

  static struct task_struct *pick_next_pushable_task(struct rq *rq)
  {
        BUG_ON(task_current(rq, p));
  }

The task_current() will check if task p and rq->curr are equal.
So, we can remove the unnecessary check in push_rt_task().

Signed-off-by: Muchun Song <smuc...@gmail.com>
---
 kernel/sched/rt.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 481bb7aa25c5..ec097edea9ca 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1813,11 +1813,6 @@ static int push_rt_task(struct rq *rq)
                return 0;
 
 retry:
-       if (unlikely(next_task == rq->curr)) {
-               WARN_ON(1);
-               return 0;
-       }
-
        /*
         * It's possible that the next_task slipped in of
         * higher priority than current. If that's the case
-- 
2.17.1