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mm, mempool: disallow mempools based on slab caches with constructors

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All occurrences of mempools based on slab caches with object constructors
have been removed from the tree, so disallow creating them.

We can only dereference mem->ctor in mm/mempool.c without including
mm/slab.h in include/linux/mempool.h.  So simply note the restriction,
just like the comment restricting usage of __GFP_ZERO, and warn on kernels
with CONFIG_DEBUG_VM() if such a mempool is allocated from.

We don't want to incur this check on every element allocation, so use
VM_BUG_ON().

Signed-off-by: David Rientjes <[email protected]>
Cc: Dave Kleikamp <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Sebastian Ott <[email protected]>
Cc: Mikulas Patocka <[email protected]>
Cc: Catalin Marinas <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Rientjes 2015-04-15 16:14:14 -07:00 • committed by Linus Torvalds
commit e244c9e66f
2 changed files with 4 additions and 1 deletions
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2
mm/mempool.c
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@ -15,6 +15,7 @@
#include <linux/mempool.h>
#include <linux/blkdev.h>
#include <linux/writeback.h>
#include "slab.h"
static void add_element(mempool_t *pool, void *element)
{
@ -334,6 +335,7 @@ EXPORT_SYMBOL(mempool_free);
void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data)
{
struct kmem_cache *mem = pool_data;
VM_BUG_ON(mem->ctor);
return kmem_cache_alloc(mem, gfp_mask);
}
EXPORT_SYMBOL(mempool_alloc_slab);