From: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
[ Upstream commit 7c4a5b89a0b5a57a64b601775b296abf77a9fe97 ]
Commit 326587b84078 ("sched: fix goto retry in pick_next_task_rt()")
removed any path which could make pick_next_rt_entity() return NULL.
However, BUG_ON(!rt_se) in _pick_next_task_rt() (the only caller of
pick_next_rt_entity()) still checks the error condition, which can
never happen, since list_entry() never returns NULL.
Remove the BUG_ON check, and instead emit a warning in the only
possible error condition here: the queue being empty which should
never happen.
Fixes: 326587b84078 ("sched: fix goto retry in pick_next_task_rt()")
Signed-off-by: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Phil Auld <pauld@xxxxxxxxxx>
Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230128-list-entry-null-check-sched-v3-1-b1a71bd1ac6b@xxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/sched/rt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index e1ce5d1868b50..f690f901b6cc7 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1616,6 +1616,8 @@ static struct sched_rt_entity *pick_next_rt_entity(struct rt_rq *rt_rq)
BUG_ON(idx >= MAX_RT_PRIO);
queue = array->queue + idx;
+ if (SCHED_WARN_ON(list_empty(queue)))
+ return NULL;
next = list_entry(queue->next, struct sched_rt_entity, run_list);
return next;
@@ -1628,7 +1630,8 @@ static struct task_struct *_pick_next_task_rt(struct rq *rq)
do {
rt_se = pick_next_rt_entity(rt_rq);
- BUG_ON(!rt_se);
+ if (unlikely(!rt_se))
+ return NULL;
rt_rq = group_rt_rq(rt_se);
} while (rt_rq);
--
2.39.2
