[PATCH v4 1/6] mm/slab: Introduce kmem_buckets typedef

[Kees Cook <kees@kernel.org>]

Encapsulate the concept of a single set of kmem_caches that are used
for the kmalloc size buckets. Redefine kmalloc_caches as an array
of these buckets (for the different global cache buckets).

Signed-off-by: Kees Cook <kees@kernel.org>
---
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: jvoisin <julien.voisin@dustri.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: linux-mm@kvack.org
---
 include/linux/slab.h | 5 +++--
 mm/slab_common.c     | 3 +--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 7247e217e21b..de2b7209cd05 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -426,8 +426,9 @@ enum kmalloc_cache_type {
 	NR_KMALLOC_TYPES
 };
 
-extern struct kmem_cache *
-kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1];
+typedef struct kmem_cache * kmem_buckets[KMALLOC_SHIFT_HIGH + 1];
+
+extern kmem_buckets kmalloc_caches[NR_KMALLOC_TYPES];
 
 /*
  * Define gfp bits that should not be set for KMALLOC_NORMAL.
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 1560a1546bb1..e0b1c109bed2 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -653,8 +653,7 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name,
 	return s;
 }
 
-struct kmem_cache *
-kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_SHIFT_HIGH + 1] __ro_after_init =
+kmem_buckets kmalloc_caches[NR_KMALLOC_TYPES] __ro_after_init =
 { /* initialization for https://llvm.org/pr42570 */ };
 EXPORT_SYMBOL(kmalloc_caches);
 
-- 
2.34.1