!1098 proc: allow pid_revalidate() during LOOKUP_RCU

Merge Pull Request from: @ci-robot 
 
PR sync from:  Li Nan <linan122@huawei.com>
 https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/thread/4EEIPQOJKUZAK6RIRH5RREOILH6ZD3EC/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/1098

 

Reviewed-by: zhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>