FAILED: patch "[PATCH] sched/core: Fix unbalance set_rq_online/offline() in" failed to apply to 4.19-stable tree

FAILED: patch "[PATCH] sched/core: Fix unbalance set_rq_online/offline() in" failed to apply to 4.19-stable tree

[gregkh]

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y
git checkout FETCH_HEAD
git cherry-pick -x fe7a11c78d2a9bdb8b50afc278a31ac177000948
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2024081254-eldest-guzzler-4fd0@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..

Possible dependencies:

fe7a11c78d2a ("sched/core: Fix unbalance set_rq_online/offline() in sched_cpu_deactivate()")
e22f910a26cc ("sched/smt: Fix unbalance sched_smt_present dec/inc")
2558aacff858 ("sched/hotplug: Ensure only per-cpu kthreads run during hotplug")
565790d28b1e ("sched: Fix balance_callback()")
c5511d03ec09 ("sched/smt: Make sched_smt_present track topology")
1f351d7f7590 ("sched: sched.h: make rq locking and clock functions available in stats.h")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From fe7a11c78d2a9bdb8b50afc278a31ac177000948 Mon Sep 17 00:00:00 2001
From: Yang Yingliang <yangyingliang@huawei.com>
Date: Wed, 3 Jul 2024 11:16:10 +0800
Subject: [PATCH] sched/core: Fix unbalance set_rq_online/offline() in
 sched_cpu_deactivate()

If cpuset_cpu_inactive() fails, set_rq_online() need be called to rollback.

Fixes: 120455c514f7 ("sched: Fix hotplug vs CPU bandwidth control")
Cc: stable@kernel.org
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240703031610.587047-5-yangyingliang@huaweicloud.com

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4d119e930beb..f3951e4a55e5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -8022,6 +8022,7 @@ int sched_cpu_deactivate(unsigned int cpu)
 	ret = cpuset_cpu_inactive(cpu);
 	if (ret) {
 		sched_smt_present_inc(cpu);
+		sched_set_rq_online(rq, cpu);
 		balance_push_set(cpu, false);
 		set_cpu_active(cpu, true);
 		sched_update_numa(cpu, true);