cgroup: make ->pre_destroy() return void

All ->pre_destory() implementations return 0 now, which is the only
allowed return value.  Make it return void.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Vivek Goyal <vgoyal@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 47868a86ba2b..adb2adc8ec1a 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -436,7 +436,7 @@ int cgroup_taskset_size(struct cgroup_taskset *tset);
 
 struct cgroup_subsys {
         struct cgroup_subsys_state *(*create)(struct cgroup *cgrp);
-        int (*pre_destroy)(struct cgroup *cgrp);
+        void (*pre_destroy)(struct cgroup *cgrp);
         void (*destroy)(struct cgroup *cgrp);
         int (*can_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
         void (*cancel_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);