From: Shakeel Butt <shakeel.butt@linux.dev>
Date: Thu, 25 Dec 2025 23:21:10 +0000 (-0800)
Subject: memcg: expose mem_cgroup_ino() and mem_cgroup_get_from_ino() unconditionally
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1d89d7fd592e2490cadd13c253d7b1b9f6116be8;p=thirdparty%2Fkernel%2Flinux.git

memcg: expose mem_cgroup_ino() and mem_cgroup_get_from_ino() unconditionally

Remove the CONFIG_SHRINKER_DEBUG guards around mem_cgroup_ino() and
mem_cgroup_get_from_ino().  These APIs provide a way to get a memcg's
cgroup inode number and to look up a memcg from an inode number
respectively.

Making these functions unconditionally available allows other in-kernel
users to leverage them without requiring CONFIG_SHRINKER_DEBUG to be
enabled.

No functional change for existing users.

Link: https://lkml.kernel.org/r/20251225232116.294540-3-shakeel.butt@linux.dev
Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: SeongJae Park <sj@kernel.org>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1c4224bcfb23e..77f32be26ea8a 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -836,14 +836,12 @@ static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
 }
 struct mem_cgroup *mem_cgroup_from_id(unsigned short id);
 
-#ifdef CONFIG_SHRINKER_DEBUG
 static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
 {
 	return memcg ? cgroup_ino(memcg->css.cgroup) : 0;
 }
 
 struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino);
-#endif
 
 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
 {
@@ -1308,7 +1306,6 @@ static inline struct mem_cgroup *mem_cgroup_from_private_id(unsigned short id)
 	return NULL;
 }
 
-#ifdef CONFIG_SHRINKER_DEBUG
 static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
 {
 	return 0;
@@ -1318,7 +1315,6 @@ static inline struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
 {
 	return NULL;
 }
-#endif
 
 static inline struct mem_cgroup *mem_cgroup_from_seq(struct seq_file *m)
 {
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 25ad8433df2e8..e85816960e38d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3620,7 +3620,6 @@ struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
 	return mem_cgroup_from_private_id(id);
 }
 
-#ifdef CONFIG_SHRINKER_DEBUG
 struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
 {
 	struct cgroup *cgrp;
@@ -3641,7 +3640,6 @@ struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
 
 	return memcg;
 }
-#endif
 
 static void free_mem_cgroup_per_node_info(struct mem_cgroup_per_node *pn)
 {