linux-kernel - [PATCH] mm: Add unlikely for current

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Message-ID: <51BC4A83.50302@gmail.com>
Date:	Sat, 15 Jun 2013 19:05:39 +0800
From:	Zhang Yanfei <zhangyanfei.yes@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux MM <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm: Add unlikely for current_order test

From: Zhang Yanfei <zhangyanfei@...fujitsu.com>

Since we have an unlikely for the "current_order >= pageblock_order / 2"
test above, adding an unlikely for this "current_order >= pageblock_order"
test seems more appropriate.

Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
---
 mm/page_alloc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c3edb62..1b6d7de 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1071,7 +1071,7 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
 			rmv_page_order(page);
 
 			/* Take ownership for orders >= pageblock_order */
-			if (current_order >= pageblock_order &&
+			if (unlikely(current_order >= pageblock_order) &&
 			    !is_migrate_cma(migratetype))
 				change_pageblock_range(page, current_order,
 							start_migratetype);
-- 
1.7.1
--
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