[tip: sched/urgent] sched/uclamp: Fix incorrect condition

[tip-bot2 for Qais Yousef]

The following commit has been merged into the sched/urgent branch of tip:

Commit-ID:     6e1ff0773f49c7d38e8b4a9df598def6afb9f415
Gitweb:        https://git.kernel.org/tip/6e1ff0773f49c7d38e8b4a9df598def6afb9f415
Author:        Qais Yousef <qais.yousef@xxxxxxx>
AuthorDate:    Thu, 14 Nov 2019 21:10:52 
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Fri, 15 Nov 2019 11:02:18 +01:00

sched/uclamp: Fix incorrect condition

uclamp_update_active() should perform the update when
p->uclamp[clamp_id].active is true. But when the logic was inverted in
[1], the if condition wasn't inverted correctly too.

[1] https://lore.kernel.org/lkml/20190902073836.GO2369@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/

Reported-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Qais Yousef <qais.yousef@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Cc: Ben Segall <bsegall@xxxxxxxxxx>
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Cc: Juri Lelli <juri.lelli@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Patrick Bellasi <patrick.bellasi@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Fixes: babbe170e053 ("sched/uclamp: Update CPU's refcount on TG's clamp changes")
Link: https://lkml.kernel.org/r/20191114211052.15116-1-qais.yousef@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 33cd250..44123b4 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1065,7 +1065,7 @@ uclamp_update_active(struct task_struct *p, enum uclamp_id clamp_id)
 	 * affecting a valid clamp bucket, the next time it's enqueued,
 	 * it will already see the updated clamp bucket value.
 	 */
-	if (!p->uclamp[clamp_id].active) {
+	if (p->uclamp[clamp_id].active) {
 		uclamp_rq_dec_id(rq, p, clamp_id);
 		uclamp_rq_inc_id(rq, p, clamp_id);
 	}