leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

mm: remove broken 'kzalloc' mempool

Browse Source 
The kzalloc mempool zeros items when they are initially allocated, but
does not rezero used items that are returned to the pool.  Consequently
mempool_alloc()s may return non-zeroed memory.

Since there are/were only two in-tree users for
mempool_create_kzalloc_pool(), and 'fixing' this in a way that will
re-zero used (but not new) items before first use is non-trivial, just
remove it.

Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sage Weil 2009-09-21 17:02:56 -07:00 committed by Linus Torvalds
parent bbba809e96
commit bba7881954
2 changed files with 2 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
include/linux/mempool.h
View File

@ -47,22 +47,16 @@ mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
}
/*
* 2 mempool_alloc_t's and a mempool_free_t to kmalloc/kzalloc and kfree
* the amount of memory specified by pool_data
* a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
* amount of memory specified by pool_data
*/
void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
void *mempool_kzalloc(gfp_t gfp_mask, void *pool_data);
void mempool_kfree(void *element, void *pool_data);
static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
{
return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
(void *) size);
}
static inline mempool_t *mempool_create_kzalloc_pool(int min_nr, size_t size)
{
return mempool_create(min_nr, mempool_kzalloc, mempool_kfree,
(void *) size);
}
/*
* A mempool_alloc_t and mempool_free_t for a simple page allocator that

7
mm/mempool.c
View File

@ -308,13 +308,6 @@ void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data)
}
EXPORT_SYMBOL(mempool_kmalloc);
void *mempool_kzalloc(gfp_t gfp_mask, void *pool_data)
{
size_t size = (size_t)pool_data;
return kzalloc(size, gfp_mask);
}
EXPORT_SYMBOL(mempool_kzalloc);
void mempool_kfree(void *element, void *pool_data)
{
kfree(element);