linux-kernel - [PATCH] slab: do not call compound_head() in page_get

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Message-Id: <1340233273-10994-1-git-send-email-walken@google.com>
Date:	Wed, 20 Jun 2012 16:01:13 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	linux-mm@...ck.org, Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] slab: do not call compound_head() in page_get_cache()

page_get_cache() does not need to call compound_head(), as its unique
caller virt_to_slab() already makes sure to return a head page.

Additionally, removing the compound_head() call makes page_get_cache()
consistent with page_get_slab().

Signed-off-by: Michel Lespinasse <walken@...gle.com>
---
 mm/slab.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index e901a36..6a1aa1f 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -501,7 +501,6 @@ static inline void page_set_cache(struct page *page, struct kmem_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;
 }
-- 
1.7.7.3

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