[PATCH v3 1/6] mm/slab: Introduce kmem_buckets typedef

Kees Cook
2024-04-24T21:41:07Z

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 <keescook@chromium.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: 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 4cc37ef22aae..c8164d5db420 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 8664da88e843..db9e1b15efd5 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