linux-kernel - [RFC PATCH 03/15] make mnt

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Message-ID: <20260110040217.1927971-4-viro@zeniv.linux.org.uk>
Date: Sat, 10 Jan 2026 04:02:05 +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 03/15] make mnt_cache static-duration

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/namespace.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index c58674a20cad..9a9882df463d 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -34,6 +34,7 @@
 #include <linux/mnt_idmapping.h>
 #include <linux/pidfs.h>
 #include <linux/nstree.h>
+#include <linux/slab-static.h>
 
 #include "pnode.h"
 #include "internal.h"
@@ -85,7 +86,8 @@ static u64 mnt_id_ctr = MNT_UNIQUE_ID_OFFSET;
 
 static struct hlist_head *mount_hashtable __ro_after_init;
 static struct hlist_head *mountpoint_hashtable __ro_after_init;
-static struct kmem_cache *mnt_cache __ro_after_init;
+static struct kmem_cache_opaque __mnt_cache;
+#define mnt_cache to_kmem_cache(&__mnt_cache)
 static DECLARE_RWSEM(namespace_sem);
 static HLIST_HEAD(unmounted);	/* protected by namespace_sem */
 static LIST_HEAD(ex_mountpoints); /* protected by namespace_sem */
@@ -5997,7 +5999,7 @@ void __init mnt_init(void)
 {
 	int err;
 
-	mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct mount),
+	kmem_cache_setup(mnt_cache, "mnt_cache", sizeof(struct mount),
 			0, SLAB_HWCACHE_ALIGN|SLAB_PANIC|SLAB_ACCOUNT, NULL);
 
 	mount_hashtable = alloc_large_system_hash("Mount-cache",
-- 
2.47.3