linux-kernel - [RFC PATCH 06/15] turn bh

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Message-ID: <20260110040217.1927971-7-viro@zeniv.linux.org.uk>
Date: Sat, 10 Jan 2026 04:02:08 +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 06/15] turn bh_cachep static-duration

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

diff --git a/fs/buffer.c b/fs/buffer.c
index 838c0c571022..c8ec1b440880 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -50,6 +50,7 @@
 #include <linux/fscrypt.h>
 #include <linux/fsverity.h>
 #include <linux/sched/isolation.h>
+#include <linux/slab-static.h>
 
 #include "internal.h"
 
@@ -2990,7 +2991,8 @@ EXPORT_SYMBOL(try_to_free_buffers);
 /*
  * Buffer-head allocation
  */
-static struct kmem_cache *bh_cachep __ro_after_init;
+static struct kmem_cache_opaque bh_cache;
+#define bh_cachep to_kmem_cache(&bh_cache)
 
 /*
  * Once the number of bh's in the machine exceeds this level, we start
@@ -3149,7 +3151,7 @@ void __init buffer_init(void)
 	unsigned long nrpages;
 	int ret;
 
-	bh_cachep = KMEM_CACHE(buffer_head,
+	KMEM_CACHE_SETUP(bh_cachep, buffer_head,
 				SLAB_RECLAIM_ACCOUNT|SLAB_PANIC);
 	/*
 	 * Limit the bh occupancy to 10% of ZONE_NORMAL
-- 
2.47.3