linux-kernel - [RFC PATCH 3/4] SLAB: minor code cleanup

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Date:	Tue, 3 Jul 2012 11:57:16 +0800
From:	Jiang Liu <jiang.liu@...wei.com>
To:	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, Mel Gorman <mgorman@...e.de>,
	Yinghai Lu <yinghai@...nel.org>
CC:	Jiang Liu <jiang.liu@...wei.com>, Tony Luck <tony.luck@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan@...nel.org>,
	Keping Chen <chenkeping@...wei.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, Jiang Liu <liuj97@...il.com>
Subject: [RFC PATCH 3/4] SLAB: minor code cleanup

Minor code cleanup for SLAB allocator.

Signed-off-by: Jiang Liu <liuj97@...il.com>
---
 mm/slab.c |   26 ++++++--------------------
 1 files changed, 6 insertions(+), 20 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index e901a36..cd163d1 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -499,34 +499,23 @@ static inline void page_set_cache(struct page *page, struct kmem_cache *cache)
 	page->lru.next = (struct list_head *)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;
-}
-
 static inline void page_set_slab(struct page *page, struct slab *slab)
 {
 	page->lru.prev = (struct list_head *)slab;
 }
 
-static inline struct slab *page_get_slab(struct page *page)
-{
-	BUG_ON(!PageSlab(page));
-	return (struct slab *)page->lru.prev;
-}
-
 static inline struct kmem_cache *virt_to_cache(const void *obj)
 {
 	struct page *page = virt_to_head_page(obj);
-	return page_get_cache(page);
+	BUG_ON(!PageSlab(page));
+	return (struct kmem_cache *)page->lru.next;
 }
 
 static inline struct slab *virt_to_slab(const void *obj)
 {
 	struct page *page = virt_to_head_page(obj);
-	return page_get_slab(page);
+	BUG_ON(!PageSlab(page));
+	return (struct slab *)page->lru.prev;
 }
 
 static inline void *index_to_obj(struct kmem_cache *cache, struct slab *slab,
@@ -3047,7 +3036,6 @@ static inline void verify_redzone_free(struct kmem_cache *cache, void *obj)
 static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 				   void *caller)
 {
-	struct page *page;
 	unsigned int objnr;
 	struct slab *slabp;
 
@@ -3055,9 +3043,7 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp,
 
 	objp -= obj_offset(cachep);
 	kfree_debugcheck(objp);
-	page = virt_to_head_page(objp);
-
-	slabp = page_get_slab(page);
+	slabp = virt_to_slab(objp);
 
 	if (cachep->flags & SLAB_RED_ZONE) {
 		verify_redzone_free(cachep, objp);
@@ -3261,7 +3247,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep,
 		struct slab *slabp;
 		unsigned objnr;
 
-		slabp = page_get_slab(virt_to_head_page(objp));
+		slabp = virt_to_slab(objp);
 		objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size;
 		slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE;
 	}
-- 
1.7.1


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