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slab: Use page struct fields instead of casting

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Add fields to the page struct so that it is properly documented that
slab overlays the lru fields.

This cleans up some casts in slab.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2012-06-13 10:24:55 -05:00 committed by Pekka Enberg
parent b5568280c9
commit e571b0ad34
2 changed files with 8 additions and 4 deletions
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4
include/linux/mm_types.h
View File

@ -110,6 +110,10 @@ struct page {
}; };
struct list_head list; /* slobs list of pages */ struct list_head list; /* slobs list of pages */
struct { /* slab fields */
struct kmem_cache *slab_cache;
struct slab *slab_page;
};
}; };
/* Remainder is not double word aligned */ /* Remainder is not double word aligned */

8
mm/slab.c
View File

@ -496,25 +496,25 @@ static bool slab_max_order_set __initdata;
*/ */
static inline void page_set_cache(struct page *page, struct kmem_cache *cache) static inline void page_set_cache(struct page *page, struct kmem_cache *cache)
{ {
page->lru.next = (struct list_head *)cache; page->slab_cache = cache;
} }
static inline struct kmem_cache *page_get_cache(struct page *page) static inline struct kmem_cache *page_get_cache(struct page *page)
{ {
page = compound_head(page); page = compound_head(page);
BUG_ON(!PageSlab(page)); BUG_ON(!PageSlab(page));
return (struct kmem_cache *)page->lru.next; return page->slab_cache;
} }
static inline void page_set_slab(struct page *page, struct slab *slab) static inline void page_set_slab(struct page *page, struct slab *slab)
{ {
page->lru.prev = (struct list_head *)slab; page->slab_page = slab;
} }
static inline struct slab *page_get_slab(struct page *page) static inline struct slab *page_get_slab(struct page *page)
{ {
BUG_ON(!PageSlab(page)); BUG_ON(!PageSlab(page));
return (struct slab *)page->lru.prev; return page->slab_page;
} }
static inline struct kmem_cache *virt_to_cache(const void *obj) static inline struct kmem_cache *virt_to_cache(const void *obj)