slab: Common Kmalloc cache determination

Extract the optimized lookup functions from slub and put them into
slab_common.c. Then make slab use these functions as well.

Joonsoo notes that this fixes some issues with constant folding which
also reduces the code size for slub.

https://lkml.org/lkml/2012/10/20/82

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/mm/slab.h b/mm/slab.h
index 44c0bd6dc19e..c01bc8921ac5 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -38,6 +38,9 @@ unsigned long calculate_alignment(unsigned long flags,
 #ifndef CONFIG_SLOB
 /* Kmalloc array related functions */
 void create_kmalloc_caches(unsigned long);
+
+/* Find the kmalloc slab corresponding for a certain size */
+struct kmem_cache *kmalloc_slab(size_t, gfp_t);
 #endif