slab: make size_index[] array u8

All those small numbers are reverse indexes into kmalloc caches array
and can't be negative.

On x86_64 "unsigned int = fls()" can drop CDQE instruction:

	add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-2 (-2)
	Function                                     old     new   delta
	kmalloc_slab                                 101      99      -2

Link: http://lkml.kernel.org/r/20180305200730.15812-7-adobriyan@gmail.com
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/slab_common.c b/mm/slab_common.c
index a4545a61a7c858ed58fa34899f253094756ccfd2..dda966e6bc58945d5263d406e8c1823bbb363beb 100644 (file)
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -971,7 +971,7 @@ EXPORT_SYMBOL(kmalloc_dma_caches);
  * of two cache sizes there. The size of larger slabs can be determined using
  * fls.
  */
-static s8 size_index[24] __ro_after_init = {
+static u8 size_index[24] __ro_after_init = {
        3,      /* 8 */
        4,      /* 16 */
        5,      /* 24 */
@@ -1009,7 +1009,7 @@ static inline int size_index_elem(size_t bytes)
  */
 struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
 {
-       int index;
+       unsigned int index;
 
        if (unlikely(size > KMALLOC_MAX_SIZE)) {
                WARN_ON_ONCE(!(flags & __GFP_NOWARN));