[RFC PATCH v3 07/10] make bh_cachep statically allocated

[Al Viro]

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

diff --git a/fs/buffer.c b/fs/buffer.c
index b0b3792b1496..e834f7091f51 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -51,6 +51,7 @@
 #include <linux/fscrypt.h>
 #include <linux/fsverity.h>
 #include <linux/sched/isolation.h>
+#include <linux/slab-static.h>
 
 #include "internal.h"
 
@@ -2906,7 +2907,8 @@ 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
@@ -3065,7 +3067,7 @@ 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