From: Nick Piggin <npiggin@suse.de>
Date: Wed, 22 Mar 2006 08:08:43 +0000 (-0800)
Subject: [PATCH] mm: optimise page_count
X-Git-Tag: v2.6.17-rc1~1129^2~42
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=617d2214ee06c209e5c375c280d50abace8058e1;p=linux-2.6

[PATCH] mm: optimise page_count

Optimise page_count compound page test and make it consistent with similar
functions.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 7d8c127daa..6aa016f1d3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -311,7 +311,7 @@ extern void FASTCALL(__page_cache_release(struct page *));
 
 static inline int page_count(struct page *page)
 {
-	if (PageCompound(page))
+	if (unlikely(PageCompound(page)))
 		page = (struct page *)page_private(page);
 	return atomic_read(&page->_count);
 }