Commits
Tejun Heo committed cb0f1fe9ba4
cgroup: move css_set_rwsem locking outside of cgroup_task_migrate() Instead of repeatedly locking and unlocking css_set_rwsem inside cgroup_task_migrate(), update cgroup_attach_task() to grab it outside of the loop and update cgroup_task_migrate() to use put_css_set_locked(). Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com>