From: Michel Lespinasse <walken@google.com>
To: linux-mm@kvack.org, Christoph Lameter <cl@linux-foundation.org>,
Pekka Enberg <penberg@kernel.org>, Matt Mackall <mpm@selenic.com>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>
Subject: [PATCH] slab: do not call compound_head() in page_get_cache()
Date: Wed, 20 Jun 2012 16:01:13 -0700 [thread overview]
Message-ID: <1340233273-10994-1-git-send-email-walken@google.com> (raw)
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@google.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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next reply other threads:[~2012-06-20 23:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-20 23:01 Michel Lespinasse [this message]
2012-06-21 1:37 ` David Rientjes
2012-07-02 10:56 ` Pekka Enberg
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