[PATCH] sched/deadline: dome some cleanup for push_dl_task()

[Peng Liu]

'commit 840d719604b0 ("sched/deadline: Update rq_clock of later_rq when pushing 
a task")'
introduced the update_rq_clock() to fix the "used-before-update" bug.

'commit f4904815f97a ("sched/deadline: Fix double accounting of rq/running bw 
in push & pull")'
took away the bug source(add_running_bw()).

We no longer need to update rq_clock in advance, let activate_task()
worry about that.

Signed-off-by: Peng Liu <iwtba...@gmail.com>
---
 kernel/sched/deadline.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 504d2f51b0d6..c3fa11f84d93 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2104,13 +2104,7 @@ static int push_dl_task(struct rq *rq)
 
        deactivate_task(rq, next_task, 0);
        set_task_cpu(next_task, later_rq->cpu);
-
-       /*
-        * Update the later_rq clock here, because the clock is used
-        * by the cpufreq_update_util() inside __add_running_bw().
-        */
-       update_rq_clock(later_rq);
-       activate_task(later_rq, next_task, ENQUEUE_NOCLOCK);
+       activate_task(later_rq, next_task, 0);
        ret = 1;
 
        resched_curr(later_rq);
-- 
2.20.1