sched: Remove superfluous resetting of the p->dl_throttled flag

Resetting the p->dl_throttled flag in rt_mutex_setprio() (for a task that is going
to be boosted) is superfluous, as the natural place to do so is in
replenish_dl_entity().

If the task was on the runqueue and it is boosted by a DL task, it will be enqueued
back with ENQUEUE_REPLENISH flag set, which can guarantee that dl_throttled is
reset in replenish_dl_entity().

This patch drops the resetting of throttled status in function rt_mutex_setprio().

Signed-off-by: Wanpeng Li <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 1428c7cebe2f4bb7a41e119bf67c4bd5ad189b12..10338ce78be4ebff4110aafe07d2efc07333bbe4 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3099,7 +3099,6 @@ void rt_mutex_setprio(struct task_struct *p, int prio)
                if (!dl_prio(p->normal_prio) ||
                    (pi_task && dl_entity_preempt(&pi_task->dl, &p->dl))) {
                        p->dl.dl_boosted = 1;
-                       p->dl.dl_throttled = 0;
                        enqueue_flag = ENQUEUE_REPLENISH;
                } else
                        p->dl.dl_boosted = 0;