linux-kernel - [RFC PATCH bpf-next v3 04/12] mm: define mem_cgroup_get_from_ino() outside of CONFIG_SHRINKER

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Message-ID: <f627edee18f43dbfcd4c2eb06a8188e88dc6bda9.1769157382.git.zhuhui@kylinos.cn>
Date: Fri, 23 Jan 2026 16:57:58 +0800
From: Hui Zhu <hui.zhu@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
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	Kees Cook <kees@...nel.org>,
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	mkoutny@...e.com,
	Jan Hendrik Farr <kernel@...rr.cc>,
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	JP Kobryn <inwardvessel@...il.com>,
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	Lance Yang <lance.yang@...ux.dev>,
	Jiayuan Chen <jiayuan.chen@...ux.dev>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	cgroups@...r.kernel.org,
	bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kselftest@...r.kernel.org
Subject: [RFC PATCH bpf-next v3 04/12] mm: define mem_cgroup_get_from_ino() outside of CONFIG_SHRINKER_DEBUG

From: Roman Gushchin <roman.gushchin@...ux.dev>

mem_cgroup_get_from_ino() can be reused by the BPF OOM implementation,
but currently depends on CONFIG_SHRINKER_DEBUG. Remove this dependency.

Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
 include/linux/memcontrol.h | 4 ++--
 mm/memcontrol.c            | 2 --
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 229ac9835adb..f3b8c71870d8 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -833,9 +833,9 @@ static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
 {
 	return memcg ? cgroup_ino(memcg->css.cgroup) : 0;
 }
+#endif
 
 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)
 {
@@ -1298,12 +1298,12 @@ static inline unsigned long mem_cgroup_ino(struct mem_cgroup *memcg)
 {
 	return 0;
 }
+#endif
 
 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 3808845bc8cc..1f74fce27677 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3658,7 +3658,6 @@ struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
 	return xa_load(&mem_cgroup_ids, id);
 }
 
-#ifdef CONFIG_SHRINKER_DEBUG
 struct mem_cgroup *mem_cgroup_get_from_ino(unsigned long ino)
 {
 	struct cgroup *cgrp;
@@ -3679,7 +3678,6 @@ 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)
 {
-- 
2.43.0