linux-kernel - [RFC PATCH 07/15] turn dentry

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Message-ID: <20260110040217.1927971-8-viro@zeniv.linux.org.uk>
Date: Sat, 10 Jan 2026 04:02:09 +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 07/15] turn dentry_cache static-duration

No need to bother with runtime_const() for it anymore...

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 fs/dcache.c                       | 8 ++++----
 include/asm-generic/vmlinux.lds.h | 3 +--
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index dc2fff4811d1..43d3b4fbedcc 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -32,6 +32,7 @@
 #include <linux/bit_spinlock.h>
 #include <linux/rculist_bl.h>
 #include <linux/list_lru.h>
+#include <linux/slab-static.h>
 #include "internal.h"
 #include "mount.h"
 
@@ -86,8 +87,8 @@ __cacheline_aligned_in_smp DEFINE_SEQLOCK(rename_lock);
 
 EXPORT_SYMBOL(rename_lock);
 
-static struct kmem_cache *__dentry_cache __ro_after_init;
-#define dentry_cache runtime_const_ptr(__dentry_cache)
+static struct kmem_cache_opaque __dentry_cache;
+#define dentry_cache to_kmem_cache(&__dentry_cache)
 
 const struct qstr empty_name = QSTR_INIT("", 0);
 EXPORT_SYMBOL(empty_name);
@@ -3265,10 +3266,9 @@ static void __init dcache_init(void)
 	 * but it is probably not worth it because of the cache nature
 	 * of the dcache.
 	 */
-	__dentry_cache = KMEM_CACHE_USERCOPY(dentry,
+	KMEM_CACHE_SETUP_USERCOPY(dentry_cache, dentry,
 		SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_ACCOUNT,
 		d_shortname.string);
-	runtime_const_init(ptr, __dentry_cache);
 
 	/* Hash may have been set up in dcache_init_early */
 	if (!hashdist)
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 8ca130af301f..6997f6301260 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -971,8 +971,7 @@
 
 #define RUNTIME_CONST_VARIABLES						\
 		RUNTIME_CONST(shift, d_hash_shift)			\
-		RUNTIME_CONST(ptr, dentry_hashtable)			\
-		RUNTIME_CONST(ptr, __dentry_cache)
+		RUNTIME_CONST(ptr, dentry_hashtable)
 
 /* Alignment must be consistent with (kunit_suite *) in include/kunit/test.h */
 #define KUNIT_TABLE()							\
-- 
2.47.3