From: Michel Lespinasse <walken@google.com>
Date: Tue, 14 Aug 2012 21:53:20 +0000 (-0700)
Subject: slab: do not call compound_head() in page_get_cache()
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=48f2474144ac708f1faad97e82a863ca8214b602;p=linux-beck.git

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@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>
---

diff --git a/mm/slab.c b/mm/slab.c
index f8b0d539b482..cb6ce2dfc7cf 100644
--- 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;
 }