[PATCH] slab: stop using page.list

slab.c is using page->list.  Switch it over to using page->lru so we can
remove page.list.

mm/slab.c

@@ -462,10 +462,10 @@ static int slab_break_gfp_order = BREAK_GFP_ORDER_LO;
  * global 'mem_map'. These are used to find the slab an obj belongs to.
  * With kfree(), these are used to find the cache which an obj belongs to.
  */
-#define	SET_PAGE_CACHE(pg,x)  ((pg)->list.next = (struct list_head *)(x))
-#define	GET_PAGE_CACHE(pg)    ((kmem_cache_t *)(pg)->list.next)
-#define	SET_PAGE_SLAB(pg,x)   ((pg)->list.prev = (struct list_head *)(x))
-#define	GET_PAGE_SLAB(pg)     ((struct slab *)(pg)->list.prev)
+#define	SET_PAGE_CACHE(pg,x)  ((pg)->lru.next = (struct list_head *)(x))
+#define	GET_PAGE_CACHE(pg)    ((kmem_cache_t *)(pg)->lru.next)
+#define	SET_PAGE_SLAB(pg,x)   ((pg)->lru.prev = (struct list_head *)(x))
+#define	GET_PAGE_SLAB(pg)     ((struct slab *)(pg)->lru.prev)
 
 /* These are the default caches for kmalloc. Custom caches can have other sizes. */
 struct cache_sizes malloc_sizes[] = {