slab: do not call compound_head() in page_get_cache()
authorMichel Lespinasse <walken@google.com>
Tue, 14 Aug 2012 21:53:20 +0000 (14:53 -0700)
committerPekka Enberg <penberg@kernel.org>
Thu, 16 Aug 2012 06:32:19 +0000 (09:32 +0300)
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>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Pekka Enberg <penberg@kernel.org>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
mm/slab.c

index f8b0d539b4822af7812c8f9edcb51224450f3f64..cb6ce2dfc7cf4d8819309110a302e560fd9745cf 100644 (file)
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -517,7 +517,6 @@ static bool slab_max_order_set __initdata;
 
 static inline struct kmem_cache *page_get_cache(struct page *page)
 {
-       page = compound_head(page);
        BUG_ON(!PageSlab(page));
        return page->slab_cache;
 }