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: 120455c ("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

Author: Yang Yingliang

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);