From 771b621ac4f95d522add18d1a7087126c03117ae Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Mon, 6 Jun 2022 17:46:42 -0700
Subject: [PATCH] 
 mm-shrinkers-introduce-debugfs-interface-for-memory-shrinkers-fix

remove WARN_ON_ONCE(), per Roman

Reported-by: syzbot+300d27c79fe6d4cbcc39@syzkaller.appspotmail.com
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/vmscan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 91232beffa63..35dedff79eb4 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -650,7 +650,7 @@ void register_shrinker_prepared(struct shrinker *shrinker)
 	down_write(&shrinker_rwsem);
 	list_add_tail(&shrinker->list, &shrinker_list);
 	shrinker->flags |= SHRINKER_REGISTERED;
-	WARN_ON_ONCE(shrinker_debugfs_add(shrinker));
+	shrinker_debugfs_add(shrinker);
 	up_write(&shrinker_rwsem);
 }
 
-- 
2.50.1