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slub: Remove BUG_ON() from ksize and omit checks for !SLUB_DEBUG 

The BUG_ONs are useless since the pointer derefs will lead to
NULL deref errors anyways. Some of the checks are not necessary
if no debugging is possible.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
This commit is contained in:
Christoph Lameter 2008-02-15 23:45:25 -08:00
parent 27d9e4e948
commit ae20bfda68
1 changed files with 2 additions and 4 deletions
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6
mm/slub.c
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@ -2610,19 +2610,17 @@ size_t ksize(const void *object)
struct page *page;
struct kmem_cache *s;
BUG_ON(!object);
if (unlikely(object == ZERO_SIZE_PTR))
return 0;
page = virt_to_head_page(object);
BUG_ON(!page);
if (unlikely(!PageSlab(page)))
return PAGE_SIZE << compound_order(page);
s = page->slab;
BUG_ON(!s);
#ifdef CONFIG_SLUB_DEBUG
/*
* Debugging requires use of the padding between object
* and whatever may come after it.
@ -2630,6 +2628,7 @@ size_t ksize(const void *object)
if (s->flags & (SLAB_RED_ZONE | SLAB_POISON))
return s->objsize;
#endif
/*
* If we have the need to store the freelist pointer
* back there or track user information then we can
@ -2637,7 +2636,6 @@ size_t ksize(const void *object)
*/
if (s->flags & (SLAB_DESTROY_BY_RCU | SLAB_STORE_USER))
return s->inuse;
/*
* Else we can use all the padding etc for the allocation
*/