linux-kernel - [PATCH 4/5] sched/deadline: Cleanup on_dl

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Date:   Fri, 26 Jul 2019 09:27:55 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>
Cc:     Luca Abeni <luca.abeni@...tannapisa.it>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <Valentin.Schneider@....com>,
        Qais Yousef <Qais.Yousef@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] sched/deadline: Cleanup on_dl_rq() handling

Remove BUG_ON() in __enqueue_dl_entity() since there is already one in
enqueue_dl_entity().

Move the check that the dl_se is not on the dl_rq from
__dequeue_dl_entity() to dequeue_dl_entity() to align with the enqueue
side and use the on_dl_rq() helper function.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
---
 kernel/sched/deadline.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 1fa005f79307..a9cb52ceb761 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1407,8 +1407,6 @@ static void __enqueue_dl_entity(struct sched_dl_entity *dl_se)
 	struct sched_dl_entity *entry;
 	int leftmost = 1;
 
-	BUG_ON(!RB_EMPTY_NODE(&dl_se->rb_node));
-
 	while (*link) {
 		parent = *link;
 		entry = rb_entry(parent, struct sched_dl_entity, rb_node);
@@ -1430,9 +1428,6 @@ static void __dequeue_dl_entity(struct sched_dl_entity *dl_se)
 {
 	struct dl_rq *dl_rq = dl_rq_of_se(dl_se);
 
-	if (RB_EMPTY_NODE(&dl_se->rb_node))
-		return;
-
 	rb_erase_cached(&dl_se->rb_node, &dl_rq->root);
 	RB_CLEAR_NODE(&dl_se->rb_node);
 
@@ -1466,6 +1461,9 @@ enqueue_dl_entity(struct sched_dl_entity *dl_se,
 
 static void dequeue_dl_entity(struct sched_dl_entity *dl_se)
 {
+	if (!on_dl_rq(dl_se))
+		return;
+
 	__dequeue_dl_entity(dl_se);
 }
 
-- 
2.17.1