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SLUB: cleanup - define macros instead of hardcoded numbers 

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Acked-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Cyrill Gorcunov 2008-10-22 23:00:38 +04:00 committed by Pekka Enberg
parent ed313489ba
commit 210b5c0613
1 changed files with 11 additions and 7 deletions
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18
mm/slub.c
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@ -153,6 +153,10 @@
#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long)
#endif #endif
#define OO_SHIFT 16
#define OO_MASK ((1 << OO_SHIFT) - 1)
#define MAX_OBJS_PER_PAGE 65535 /* since page.objects is u16 */
/* Internal SLUB flags */ /* Internal SLUB flags */
#define __OBJECT_POISON 0x80000000 /* Poison object */ #define __OBJECT_POISON 0x80000000 /* Poison object */
#define __SYSFS_ADD_DEFERRED 0x40000000 /* Not yet visible via sysfs */ #define __SYSFS_ADD_DEFERRED 0x40000000 /* Not yet visible via sysfs */
@ -290,7 +294,7 @@ static inline struct kmem_cache_order_objects oo_make(int order,
unsigned long size) unsigned long size)
{ {
struct kmem_cache_order_objects x = { struct kmem_cache_order_objects x = {
(order << 16) + (PAGE_SIZE << order) / size (order << OO_SHIFT) + (PAGE_SIZE << order) / size
}; };
return x; return x;
@ -298,12 +302,12 @@ static inline struct kmem_cache_order_objects oo_make(int order,
static inline int oo_order(struct kmem_cache_order_objects x) static inline int oo_order(struct kmem_cache_order_objects x)
{ {
return x.x >> 16; return x.x >> OO_SHIFT;
} }
static inline int oo_objects(struct kmem_cache_order_objects x) static inline int oo_objects(struct kmem_cache_order_objects x)
{ {
return x.x & ((1 << 16) - 1); return x.x & OO_MASK;
} }
#ifdef CONFIG_SLUB_DEBUG #ifdef CONFIG_SLUB_DEBUG
@ -764,8 +768,8 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
} }
max_objects = (PAGE_SIZE << compound_order(page)) / s->size; max_objects = (PAGE_SIZE << compound_order(page)) / s->size;
if (max_objects > 65535) if (max_objects > MAX_OBJS_PER_PAGE)
max_objects = 65535; max_objects = MAX_OBJS_PER_PAGE;
if (page->objects != max_objects) { if (page->objects != max_objects) {
slab_err(s, page, "Wrong number of objects. Found %d but " slab_err(s, page, "Wrong number of objects. Found %d but "
@ -1807,8 +1811,8 @@ static inline int slab_order(int size, int min_objects,
int rem; int rem;
int min_order = slub_min_order; int min_order = slub_min_order;
if ((PAGE_SIZE << min_order) / size > 65535) if ((PAGE_SIZE << min_order) / size > MAX_OBJS_PER_PAGE)
return get_order(size * 65535) - 1; return get_order(size * MAX_OBJS_PER_PAGE) - 1;
for (order = max(min_order, for (order = max(min_order,
fls(min_objects * size - 1) - PAGE_SHIFT); fls(min_objects * size - 1) - PAGE_SHIFT);