mm, sl[aou]b: Extract common code for kmem_cache_create()

Kmem_cache_create() does a variety of sanity checks but those
vary depending on the allocator. Use the strictest tests and put them into
a slab_common file. Make the tests conditional on CONFIG_DEBUG_VM.

This patch has the effect of adding sanity checks for SLUB and SLOB
under CONFIG_DEBUG_VM and removes the checks in SLAB for !CONFIG_DEBUG_VM.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 0dd2dfa7bec..0cb7c7eb041 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -130,6 +130,10 @@ int kmem_cache_shrink(struct kmem_cache *);
 void kmem_cache_free(struct kmem_cache *, void *);
 unsigned int kmem_cache_size(struct kmem_cache *);
 
+/* Slab internal function */
+struct kmem_cache *__kmem_cache_create(const char *, size_t, size_t,
+                        unsigned long,
+                        void (*)(void *));
 /*
  * Please use this macro to create slab caches. Simply specify the
  * name of the structure and maybe some flags that are listed above.