Commit-ID: c51b8ab5ad972df26fd9c0ffad34870e98273c4c Gitweb: http://git.kernel.org/tip/c51b8ab5ad972df26fd9c0ffad34870e98273c4c Author: Wanpeng Li <wanpeng.li@xxxxxxxxxxxxxxx> AuthorDate: Thu, 6 Nov 2014 15:22:44 +0800 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Sun, 16 Nov 2014 10:58:57 +0100 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 <wanpeng.li@xxxxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: Juri Lelli <juri.lelli@xxxxxxx> Cc: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/1415258564-8573-1-git-send-email-wanpeng.li@xxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- 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 bb1464b..9594c12 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) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html