cgroup: kill subsys->can_attach_task(), pre_attach() and attach_task()

These three methods are no longer used.  Kill them.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul Menage <paul@paulmenage.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 34256ad9e55..7ad5e406c42 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -490,11 +490,8 @@ struct cgroup_subsys {
         void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
         int (*can_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
                           struct cgroup_taskset *tset);
-        int (*can_attach_task)(struct cgroup *cgrp, struct task_struct *tsk);
         void (*cancel_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
                               struct cgroup_taskset *tset);
-        void (*pre_attach)(struct cgroup *cgrp);
-        void (*attach_task)(struct cgroup *cgrp, struct task_struct *tsk);
         void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
                        struct cgroup_taskset *tset);
         void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);