Unverified Commit c9a2e835 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!13414 sched/topology: Prevent race condition in sched_domain topology 

Merge Pull Request from: @ci-robot 
 
PR sync from: Zicheng Qu <quzicheng@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/NHM5TOF727PZJFUD6LULT4JNL7F7V2VW/ 
 
https://gitee.com/openeuler/kernel/issues/IB485D 
 
Link:https://gitee.com/openeuler/kernel/pulls/13414

 

Reviewed-by: default avatarLi Nan <linan122@huawei.com>
Signed-off-by: default avatarLi Nan <linan122@huawei.com>
parents 5d20825c 01362481

kernel/sched/topology.c

+6 −0
Original line number Diff line number Diff line
@@ -1722,7 +1722,13 @@ int sched_cluster_handler(struct ctl_table *table, int write, 
	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);

	if (!ret && write) {

		if (oldval != sysctl_sched_cluster) {

			/*

			 * Here may have raced with partition_sched_domains_locked,

			 * it needs to be protected with sched_domains_mutex.

			 */

			mutex_lock(&sched_domains_mutex);

			set_sched_cluster();

			mutex_unlock(&sched_domains_mutex);

			arch_rebuild_cpu_topology();

		}

	}