!6309 v5 ima: Avoid blocking in RCU read-side critical section

Merge Pull Request from: @ci-robot 
 
PR sync from: GUO Zihua <guozihua@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/4J56TVV3P7RF2MMZQHR5BCP7WQGJNVUY/ 
 
https://gitee.com/openeuler/kernel/issues/I9HXKB 
 
Link:https://gitee.com/openeuler/kernel/pulls/6309

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>