linux-kernel - [RFC PATCH 08/15] turn files

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Message-ID: <20260110040217.1927971-9-viro@zeniv.linux.org.uk>
Date: Sat, 10 Jan 2026 04:02:10 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: linux-mm@...ck.org
Cc: Vlastimil Babka <vbabka@...e.cz>,
	Harry Yoo <harry.yoo@...cle.com>,
	linux-fsdevel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Mateusz Guzik <mguzik@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 08/15] turn files_cachep static-duration

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 include/linux/fdtable.h | 3 ++-
 kernel/fork.c           | 4 ++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/linux/fdtable.h b/include/linux/fdtable.h
index c45306a9f007..f2d553f99c58 100644
--- a/include/linux/fdtable.h
+++ b/include/linux/fdtable.h
@@ -113,6 +113,7 @@ int iterate_fd(struct files_struct *, unsigned,
 extern int close_fd(unsigned int fd);
 extern struct file *file_close_fd(unsigned int fd);
 
-extern struct kmem_cache *files_cachep;
+extern struct kmem_cache_opaque files_cache;
+#define files_cachep to_kmem_cache(&files_cache)
 
 #endif /* __LINUX_FDTABLE_H */
diff --git a/kernel/fork.c b/kernel/fork.c
index 23ed80d0d6d0..8c4d9a81ef42 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -472,7 +472,7 @@ static struct kmem_cache_opaque signal_cache;
 struct kmem_cache *sighand_cachep;
 
 /* SLAB cache for files_struct structures (tsk->files) */
-struct kmem_cache *files_cachep;
+struct kmem_cache_opaque files_cache;
 
 /* SLAB cache for fs_struct structures (tsk->fs) */
 struct kmem_cache *fs_cachep;
@@ -3029,7 +3029,7 @@ void __init proc_caches_init(void)
 			sizeof(struct signal_struct), 0,
 			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT,
 			NULL);
-	files_cachep = kmem_cache_create("files_cache",
+	kmem_cache_setup(files_cachep, "files_cache",
 			sizeof(struct files_struct), 0,
 			SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT,
 			NULL);
-- 
2.47.3