linux-kernel - [PATCH] Fix crash with FLAT_MEMORY and ARCH_PFN

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Message-Id: <20071218120300.7565AE3030@solo.franken.de>
Date:	Tue, 18 Dec 2007 13:03:00 +0100 (CET)
From:	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:	linux-kernel@...r.kernel.org
Cc:	Mel Gorman <mel@....ul.ie>, Bob Picco <bob.picco@...com>,
	Dave Hansen <haveblue@...ibm.com>,
	Andy Whitcroft <apw@...dowen.org>, Andi Kleen <ak@....de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"Keith Mannthey" <kmannth@...il.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	akpm@...ux-foundation.org, Linus Torvalds <torvalds@...l.org>
Subject: [PATCH] Fix crash with FLAT_MEMORY and ARCH_PFN_OFFSET != 0

When using FLAT_MEMORY and ARCH_PFN_OFFSET is not 0, the kernel
crashes in memmap_init_zone(). This bug got introduced by
commit c713216deebd95d2b0ab38fef8bb2361c0180c2d

Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
---

 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 b5a58d4..496f7f3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3427,7 +3427,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
 		mem_map = NODE_DATA(0)->node_mem_map;
 #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
 		if (page_to_pfn(mem_map) != pgdat->node_start_pfn)
-			mem_map -= pgdat->node_start_pfn;
+			mem_map -= (pgdat->node_start_pfn - ARCH_PFN_OFFSET);
 #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */
 	}
 #endif
--
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