!2337 mm: memory-failure: use rcu lock instead of tasklist_lock when collect_procs()

Merge Pull Request from: @ci-robot 
 
PR sync from: Tong Tiangen <tongtiangen@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/CIHF2JZT2ZFLOCHPW5LAKOTCFPUHXW6Y/ 
 
https://gitee.com/openeuler/kernel/issues/I85WL9 
 
Link:https://gitee.com/openeuler/kernel/pulls/2337

 

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