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Slab allocators: consistent ZERO_SIZE_PTR support and NULL result semantics

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Define ZERO_OR_NULL_PTR macro to be able to remove the checks from the
allocators.  Move ZERO_SIZE_PTR related stuff into slab.h.

Make ZERO_SIZE_PTR work for all slab allocators and get rid of the
WARN_ON_ONCE(size == 0) that is still remaining in SLAB.

Make slub return NULL like the other allocators if a too large memory segment
is requested via __kmalloc.

Signed-off-by: Christoph Lameter <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2007-07-17 04:03:22 -07:00 • committed by Linus Torvalds
commit 6cb8f91320
7 changed files with 57 additions and 35 deletions
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13
mm/slab.c
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@ -775,6 +775,9 @@ static inline struct kmem_cache *__find_general_cachep(size_t size,
*/
BUG_ON(malloc_sizes[INDEX_AC].cs_cachep == NULL);
#endif
if (!size)
return ZERO_SIZE_PTR;
while (size > csizep->cs_size)
csizep++;
@ -2351,7 +2354,7 @@ kmem_cache_create (const char *name, size_t size, size_t align,
* this should not happen at all.
* But leave a BUG_ON for some lucky dude.
*/
BUG_ON(!cachep->slabp_cache);
BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
}
cachep->ctor = ctor;
cachep->name = name;
@ -3653,8 +3656,8 @@ __do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller)
struct kmem_cache *cachep;
cachep = kmem_find_general_cachep(size, flags);
if (unlikely(cachep == NULL))
return NULL;
if (unlikely(ZERO_OR_NULL_PTR(cachep)))
return cachep;
return kmem_cache_alloc_node(cachep, flags, node);
}
@ -3760,7 +3763,7 @@ void kfree(const void *objp)
struct kmem_cache *c;
unsigned long flags;
if (unlikely(!objp))
if (unlikely(ZERO_OR_NULL_PTR(objp)))
return;
local_irq_save(flags);
kfree_debugcheck(objp);
@ -4447,7 +4450,7 @@ const struct seq_operations slabstats_op = {
*/
size_t ksize(const void *objp)
{
if (unlikely(objp == NULL))
if (unlikely(ZERO_OR_NULL_PTR(objp)))
return 0;
return obj_size(virt_to_cache(objp));