linux-kernel - [PATCH] mm/page_alloc: fix the range check for backward merging

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Message-ID: <20100103120435.GA3576@epsilou.com>
Date:	Sun, 3 Jan 2010 21:04:35 +0900
From:	Kazuhisa Ichikawa <ki@...ilou.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] mm/page_alloc: fix the range check for backward merging

From: Kazuhisa Ichikawa <ki@...ilou.com>

The current check for 'backward merging' within add_active_range()
does not seem correct.  start_pfn must be compared against
early_node_map[i].start_pfn (and NOT against .end_pfn) to find out
whether the new region is backward-mergeable with the existing range.

Signed-off-by: Kazuhisa Ichikawa <ki@...ilou.com>
---
 (This patch applies to linux-2.6.33-rc2)

--- a/mm/page_alloc.c	2009-12-25 06:09:41.000000000 +0900
+++ b/mm/page_alloc.c	2010-01-03 19:20:36.000000000 +0900
@@ -3998,7 +3998,7 @@ void __init add_active_range(unsigned in
 		}
 
 		/* Merge backward if suitable */
-		if (start_pfn < early_node_map[i].end_pfn &&
+		if (start_pfn < early_node_map[i].start_pfn &&
 				end_pfn >= early_node_map[i].start_pfn) {
 			early_node_map[i].start_pfn = start_pfn;
 			return;
--
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