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slab allocators: MAX_ORDER one off fix

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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: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter 2007-06-23 17:16:43 -07:00 committed by Linus Torvalds
parent 71c4215790
commit debee0768e
1 changed files with 2 additions and 2 deletions
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4
include/linux/slab.h
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@ -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)