!8297 v2 powerpc/mm: Fix lockup on kernel exec fault

Merge Pull Request from: @ci-robot 
 
PR sync from: Liu Shixin <liushixin2@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/EQLGBJEFOECYUVK2UV33YS73B6Z47F7I/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9R4CI 
 
Link:https://gitee.com/openeuler/kernel/pulls/8297

 

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