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SubjectRe: [PATCH 4/5] sched/deadline: Cleanup on_dl_rq() handling
On Fri, Jul 26, 2019 at 09:27:55AM +0100, Dietmar Eggemann wrote:
> 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@arm.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;

Why allow double dequeue instead of WARN?

> +
> __dequeue_dl_entity(dl_se);
> }
>
> --
> 2.17.1
>

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