[PATCH] sched/pelt: check that *_avg are null when *_sum are

[Vincent Guittot]

Check that we never break the rule that pelt's avg values are null if
pelt's sum are.

Signed-off-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
---

This is what I used for patch 20210601085832.12626-1-vincent.guittot@xxxxxxxxxx

 kernel/sched/fair.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a2c30e52de76..c17feadeafcc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8021,6 +8021,15 @@ static inline bool cfs_rq_is_decayed(struct cfs_rq *cfs_rq)
 	if (cfs_rq->avg.runnable_sum)
 		return false;
 
+	/*
+	 * _avg must be null when _sum are null because _avg = _sum / divider
+	 * Make sure that rounding and/or propagation of PELT values never
+	 * break this.
+	 */
+	SCHED_WARN_ON(cfs_rq->avg.load_avg ||
+		      cfs_rq->avg.util_avg ||
+		      cfs_rq->avg.runnable_avg);
+
 	return true;
 }
 
-- 
2.17.1