Patch "sched/fair: Fix cfs_rq_is_decayed() on !SMP" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    sched/fair: Fix cfs_rq_is_decayed() on !SMP

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sched-fair-fix-cfs_rq_is_decayed-on-smp.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f0faa940ccf50634148d43fd74454ef7d32c297d
Author: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
Date:   Wed Sep 13 13:20:31 2023 +0000

    sched/fair: Fix cfs_rq_is_decayed() on !SMP
    
    [ Upstream commit c0490bc9bb62d9376f3dd4ec28e03ca0fef97152 ]
    
    We don't need to maintain per-queue leaf_cfs_rq_list on !SMP, since
    it's used for cfs_rq load tracking & balancing on SMP.
    
    But sched debug interface uses it to print per-cfs_rq stats.
    
    This patch fixes the !SMP version of cfs_rq_is_decayed(), so the
    per-queue leaf_cfs_rq_list is also maintained correctly on !SMP,
    to fix the warning in assert_list_leaf_cfs_rq().
    
    Fixes: 0a00a354644e ("sched/fair: Delete useless condition in tg_unthrottle_up()")
    Reported-by: Leo Yu-Chi Liang <ycliang@xxxxxxxxxxxxx>
    Signed-off-by: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>
    Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
    Tested-by: Leo Yu-Chi Liang <ycliang@xxxxxxxxxxxxx>
    Reviewed-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
    Closes: https://lore.kernel.org/all/ZN87UsqkWcFLDxea@swlinux02/
    Link: https://lore.kernel.org/r/20230913132031.2242151-1-chengming.zhou@xxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index df348aa55d3c7..6af1d48d467ed 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4932,7 +4932,7 @@ static inline void update_misfit_status(struct task_struct *p, struct rq *rq)
 
 static inline bool cfs_rq_is_decayed(struct cfs_rq *cfs_rq)
 {
-	return true;
+	return !cfs_rq->nr_running;
 }
 
 #define UPDATE_TG	0x0



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