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Add virt_to_head_page and consolidate code in slab and slub

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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
2007-05-06 14:49:41 -07:00
committed by Linus Torvalds
parent 6d7779538f
commit b49af68ff9
3 changed files with 14 additions and 11 deletions
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9
mm/slab.c
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@@ -614,20 +614,19 @@ static inline void page_set_slab(struct page *page, struct slab *slab)
static inline struct slab *page_get_slab(struct page *page)
{
page = compound_head(page);
BUG_ON(!PageSlab(page));
return (struct slab *)page->lru.prev;
}
static inline struct kmem_cache *virt_to_cache(const void *obj)
{
struct page *page = virt_to_page(obj);
struct page *page = virt_to_head_page(obj);
return page_get_cache(page);
}
static inline struct slab *virt_to_slab(const void *obj)
{
struct page *page = virt_to_page(obj);
struct page *page = virt_to_head_page(obj);
return page_get_slab(page);
}
@@ -2876,7 +2875,7 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
objp -= obj_offset(cachep);
kfree_debugcheck(objp);
page = virt_to_page(objp);
page = virt_to_head_page(objp);
slabp = page_get_slab(page);
@@ -3100,7 +3099,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
struct slab *slabp;
unsigned objnr;
slabp = page_get_slab(virt_to_page(objp));
slabp = page_get_slab(virt_to_head_page(objp));
objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size;
slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE;
}