Revert "cgroup: remove bind() method from cgroup_subsys."

This reverts commit 84cfb6ab484b442d5115eb3baf9db7d74a3ea626.  There
are scheduled changes which make use of the removed callback.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Rami Rosen <ramirose@gmail.com>
Cc: Li Zefan <lizefan@huawei.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index a2b9d4b13369..45aee0fc6b98 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -484,6 +484,8 @@ struct cgroup_subsys {
         void (*fork)(struct task_struct *task);
         void (*exit)(struct cgroup *cgrp, struct cgroup *old_cgrp,
                      struct task_struct *task);
+        void (*bind)(struct cgroup *root);
+
         int subsys_id;
         int active;
         int disabled;