linux-kernel - [PATCH 2/8] memcg: expose mem_cgroup_ino() and mem_cgroup_get_from

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251225232116.294540-3-shakeel.butt@linux.dev>
Date: Thu, 25 Dec 2025 15:21:10 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	SeongJae Park <sj@...nel.org>,
	Meta kernel team <kernel-team@...a.com>,
	linux-mm@...ck.org,
	cgroups@...r.kernel.org,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/8] 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.

Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>
---
 include/linux/memcontrol.h | 4 ----
 mm/memcontrol.c            | 2 --
 2 files changed, 6 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 1c4224bcfb23..77f32be26ea8 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 25ad8433df2e..e85816960e38 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)
 {
-- 
2.47.3