Unverified Commit f0eddd0b authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!5565 tracing: Ensure visibility when inserting an element into tracing_map 

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Yejian <zhengyejian1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/IBMDZEYMS2MVA6I7P7Z2DEAMC6FY67XR/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9BV24 
 
Link:https://gitee.com/openeuler/kernel/pulls/5565

 

Reviewed-by: default avatarLiu YongQiang <liuyongqiang13@huawei.com>
Reviewed-by: default avatarXu Kuohai <xukuohai@huawei.com>
Signed-off-by: default avatarZhang Changzhong <zhangchangzhong@huawei.com>
parents f3187686 585148ff

kernel/trace/tracing_map.c

+6 −1
Original line number Diff line number Diff line
@@ -571,7 +571,12 @@ __tracing_map_insert(struct tracing_map *map, void *key, bool lookup_only) 
				}



				memcpy(elt->key, key, map->key_size);

				entry->val = elt;

				/*

				 * Ensure the initialization is visible and

				 * publish the elt.

				 */

				smp_wmb();

				WRITE_ONCE(entry->val, elt);

				atomic64_inc(&map->hits);



				return entry->val;