mm, slab: remove dflags

cachep->dflags is never referenced, so remove it.

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

include/linux/slab_def.h

@@ -45,7 +45,6 @@ struct kmem_cache {
 	unsigned int colour_off;	/* colour offset */
 	struct kmem_cache *slabp_cache;
 	unsigned int slab_size;
-	unsigned int dflags;		/* dynamic flags */
 
 	/* constructor func */
 	void (*ctor)(void *obj);