slab: Common definition for the array of kmalloc caches

Have a common definition fo the kmalloc cache arrays in
SLAB and SLUB

Acked-by: Glauber Costa <glommer@parallels.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

include/linux/slab.h

@@ -206,6 +206,11 @@ struct kmem_cache {
 #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW)
 #endif
 
+extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
+#ifdef CONFIG_ZONE_DMA
+extern struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
+#endif
+
 /*
  * Figure out which kmalloc slab an allocation of a certain size
  * belongs to.

include/linux/slab_def.h

@@ -102,9 +102,6 @@ struct kmem_cache {
 	 */
 };
 
-extern struct kmem_cache *kmalloc_caches[PAGE_SHIFT + MAX_ORDER];
-extern struct kmem_cache *kmalloc_dma_caches[PAGE_SHIFT + MAX_ORDER];
-
 void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
 void *__kmalloc(size_t size, gfp_t flags);
 

include/linux/slub_def.h

@@ -122,12 +122,6 @@ struct kmem_cache {
 #define SLUB_DMA (__force gfp_t)0
 #endif
 
-/*
- * We keep the general caches in an array of slab caches that are used for
- * 2^x bytes of allocations.
- */
-extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
-
 /*
  * Find the slab cache for a given combination of allocation flags and size.
  *

mm/slab.c

@@ -318,14 +318,6 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int len,
 static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp);
 static void cache_reap(struct work_struct *unused);
 
-struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
-EXPORT_SYMBOL(kmalloc_caches);
-
-#ifdef CONFIG_ZONE_DMA
-struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
-EXPORT_SYMBOL(kmalloc_dma_caches);
-#endif
-
 static int slab_early_init = 1;
 
 #define INDEX_AC kmalloc_index(sizeof(struct arraycache_init))

mm/slab_common.c

@@ -319,6 +319,14 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size,
 	return s;
 }
 
+struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
+EXPORT_SYMBOL(kmalloc_caches);
+
+#ifdef CONFIG_ZONE_DMA
+struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
+EXPORT_SYMBOL(kmalloc_dma_caches);
+#endif
+
 #endif /* !CONFIG_SLOB */
 
 

mm/slub.c

@@ -3174,13 +3174,6 @@ int __kmem_cache_shutdown(struct kmem_cache *s)
  *		Kmalloc subsystem
  *******************************************************************/
 
-struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
-EXPORT_SYMBOL(kmalloc_caches);
-
-#ifdef CONFIG_ZONE_DMA
-static struct kmem_cache *kmalloc_dma_caches[KMALLOC_SHIFT_HIGH + 1];
-#endif
-
 static int __init setup_slub_min_order(char *str)
 {
 	get_option(&str, &slub_min_order);