From c51b8ab5ad972df26fd9c0ffad34870e98273c4c Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Thu, 6 Nov 2014 15:22:44 +0800 Subject: [PATCH] sched/deadline: Fix rq->dl.pushable_tasks bug in push_dl_task() Do not call dequeue_pushable_dl_task() when failing to push an eligible task, as it remains pushable, merely not at this particular moment. Actually the patch is the same behavior as commit 311e800e16f6 ("sched, rt: Fix rq->rt.pushable_tasks bug in push_rt_task()" in -rt side. Signed-off-by: Wanpeng Li Signed-off-by: Peter Zijlstra (Intel) Cc: Juri Lelli Cc: Kirill Tkhai Cc: Linus Torvalds Link: http://lkml.kernel.org/r/1415258564-8573-1-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar --- kernel/sched/deadline.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index bb1464baee84..9594c128ff17 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -1328,6 +1328,7 @@ static int push_dl_task(struct rq *rq) { struct task_struct *next_task; struct rq *later_rq; + int ret = 0; if (!rq->dl.overloaded) return 0; @@ -1373,7 +1374,6 @@ retry: * The task is still there. We don't try * again, some other cpu will pull it when ready. */ - dequeue_pushable_dl_task(rq, next_task); goto out; } @@ -1389,6 +1389,7 @@ retry: deactivate_task(rq, next_task, 0); set_task_cpu(next_task, later_rq->cpu); activate_task(later_rq, next_task, 0); + ret = 1; resched_curr(later_rq); @@ -1397,7 +1398,7 @@ retry: out: put_task_struct(next_task); - return 1; + return ret; } static void push_dl_tasks(struct rq *rq) -- 2.34.1