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, 2 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6678f991c6c6..a1811ce60e20 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5002,12 +5002,11 @@ free_out:
         return ERR_PTR(error);
 }
 
-static int mem_cgroup_pre_destroy(struct cgroup *cont)
+static void mem_cgroup_pre_destroy(struct cgroup *cont)
 {
         struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
 
         mem_cgroup_reparent_charges(memcg);
-        return 0;
 }
 
 static void mem_cgroup_destroy(struct cgroup *cont)