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@xxxxxxxxxxxxx>
Reviewed-by: Joonsoo Kim <js1304@xxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
include/linux/mm_types.h | 4 ++++
mm/slab.c | 8 ++++----
2 files changed, 8 insertions(+), 4 deletions(-)
Index: linux-2.6/mm/slab.c
===================================================================
--- linux-2.6.orig/mm/slab.c 2012-06-13 03:44:15.321477984 -0500
+++ linux-2.6/mm/slab.c 2012-06-13 03:45:57.341475870 -0500
@@ -496,25 +496,25 @@ static bool slab_max_order_set __initdat
*/
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)
{
page = compound_head(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)
{
- page->lru.prev = (struct list_head *)slab;
+ page->slab_page = slab;
}
static inline struct slab *page_get_slab(struct page *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)
Index: linux-2.6/include/linux/mm_types.h
===================================================================
--- linux-2.6.orig/include/linux/mm_types.h 2012-06-13 03:44:40.433477464 -0500
+++ linux-2.6/include/linux/mm_types.h 2012-06-13 03:44:40.525477462 -0500
@@ -110,6 +110,10 @@ struct page {
};
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 */
--
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