[PATCH] mm: memcg-v1: make mem_cgroup_oom_notify_cb() return void

[Guopeng Zhang <guopeng.zhang@linux.dev>]

From: Guopeng Zhang <zhangguopeng@kylinos.cn>

Commit 7d74b06f240f ("memcg: use for_each_mem_cgroup") replaced the
mem_cgroup_walk_tree() call in mem_cgroup_oom_notify() with
for_each_mem_cgroup_tree(), but left mem_cgroup_oom_notify_cb() with the
int return type required by the old callback interface.

The function now has a single direct caller and no failure path. Make it
return void.

Signed-off-by: Guopeng Zhang <zhangguopeng@kylinos.cn>
---
 mm/memcontrol-v1.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c
index e8b6e1560278..73bea1b5c8dd 100644
--- a/mm/memcontrol-v1.c
+++ b/mm/memcontrol-v1.c
@@ -752,7 +752,7 @@ static int compare_thresholds(const void *a, const void *b)
 	return 0;
 }
 
-static int mem_cgroup_oom_notify_cb(struct mem_cgroup *memcg)
+static void mem_cgroup_oom_notify_cb(struct mem_cgroup *memcg)
 {
 	struct mem_cgroup_eventfd_list *ev;
 
@@ -762,7 +762,6 @@ static int mem_cgroup_oom_notify_cb(struct mem_cgroup *memcg)
 		eventfd_signal(ev->eventfd);
 
 	spin_unlock(&memcg_oom_lock);
-	return 0;
 }
 
 static void mem_cgroup_oom_notify(struct mem_cgroup *memcg)
-- 
2.43.0