!1706 cgroup: fix missing cpus_read_{lock,unlock}() in cgroup_transfer_tasks()

Merge Pull Request from: @ci-robot 
 
PR sync from: Cai Xinchen <caixinchen1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/R5VDLUCTJIKFKEHD6B6QZQN4TXCBED4Q/ 
 
https://gitee.com/openeuler/kernel/issues/I7RPDX 
 
Link:https://gitee.com/openeuler/kernel/pulls/1706

 

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