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Commit debee076 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
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slab allocators: MAX_ORDER one off fix 



MAX_ORDER is the first order that is not possible.

Use MAX_ORDER - 1 to calculate the larges possible object size in slab.h

Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 71c42157

include/linux/slab.h

+2 −2
Original line number Diff line number Diff line
@@ -82,8 +82,8 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep, 
 * to do various tricks to work around compiler limitations in order to

 * ensure proper constant folding.

 */

#define KMALLOC_SHIFT_HIGH	((MAX_ORDER + PAGE_SHIFT) <= 25 ? \

				(MAX_ORDER + PAGE_SHIFT) : 25)

#define KMALLOC_SHIFT_HIGH	((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \

				(MAX_ORDER + PAGE_SHIFT - 1) : 25)



#define KMALLOC_MAX_SIZE	(1UL << KMALLOC_SHIFT_HIGH)

#define KMALLOC_MAX_ORDER	(KMALLOC_SHIFT_HIGH - PAGE_SHIFT)