From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx196.postini.com [74.125.245.196]) by kanga.kvack.org (Postfix) with SMTP id D09DD6B0074 for ; Wed, 13 Jun 2012 11:25:18 -0400 (EDT) Message-Id: <20120613152516.987570955@linux.com> Date: Wed, 13 Jun 2012 10:24:55 -0500 From: Christoph Lameter Subject: Common [04/20] [slab] Use page struct fields instead of casting References: <20120613152451.465596612@linux.com> Content-Disposition: inline; filename=slab_page_struct_fields Sender: owner-linux-mm@kvack.org List-ID: To: Pekka Enberg Cc: linux-mm@kvack.org, David Rientjes , Matt Mackall , Glauber Costa , Joonsoo Kim Add fields to the page struct so that it is properly documented that slab overlays the lru fields. This cleans up some casts in slab. Reviewed-by: Glauber Costa Reviewed-by: Joonsoo Kim Signed-off-by: Christoph Lameter --- include/linux/mm_types.h | 4 ++++ mm/slab.c | 8 ++++---- 2 files changed, 8 insertions(+), 4 deletions(-) Index: linux-2.6/mm/slab.c =================================================================== --- linux-2.6.orig/mm/slab.c 2012-06-13 03:44:15.321477984 -0500 +++ linux-2.6/mm/slab.c 2012-06-13 03:45:57.341475870 -0500 @@ -496,25 +496,25 @@ static bool slab_max_order_set __initdat */ static inline void page_set_cache(struct page *page, struct kmem_cache *cache) { - page->lru.next = (struct list_head *)cache; + page->slab_cache = cache; } static inline struct kmem_cache *page_get_cache(struct page *page) { page = compound_head(page); BUG_ON(!PageSlab(page)); - return (struct kmem_cache *)page->lru.next; + return page->slab_cache; } static inline void page_set_slab(struct page *page, struct slab *slab) { - page->lru.prev = (struct list_head *)slab; + page->slab_page = slab; } static inline struct slab *page_get_slab(struct page *page) { BUG_ON(!PageSlab(page)); - return (struct slab *)page->lru.prev; + return page->slab_page; } static inline struct kmem_cache *virt_to_cache(const void *obj) Index: linux-2.6/include/linux/mm_types.h =================================================================== --- linux-2.6.orig/include/linux/mm_types.h 2012-06-13 03:44:40.433477464 -0500 +++ linux-2.6/include/linux/mm_types.h 2012-06-13 03:44:40.525477462 -0500 @@ -110,6 +110,10 @@ struct page { }; struct list_head list; /* slobs list of pages */ + struct { /* slab fields */ + struct kmem_cache *slab_cache; + struct slab *slab_page; + }; }; /* Remainder is not double word aligned */ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org