From: Nick Piggin <npiggin@suse.de>

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>
---

 include/linux/mm.h |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -puN include/linux/mm.h~mm-opt-page_count include/linux/mm.h
--- devel/include/linux/mm.h~mm-opt-page_count	2006-02-19 20:33:02.000000000 -0800
+++ devel-akpm/include/linux/mm.h	2006-02-19 20:33:02.000000000 -0800
@@ -311,7 +311,7 @@ extern void FASTCALL(__page_cache_releas
 
 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);
 }
_