linux-kernel - Fix for xen guest with mem

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Message-Id: <1221333418.6036.9.camel@sirius>
Date:	Sat, 13 Sep 2008 21:16:58 +0200
From:	Roberto De Ioris <roberto@...it.it>
To:	jeremy@...source.com, linux-kernel@...r.kernel.org
Cc:	Mirko Iannella <mirko@...it.it>
Subject: Fix for xen guest with mem > 3.7G

Xen domU kernel 2.6.26 and 2.6.27-rc cannot allocate
more than 3.7GB of ram on my PAE systems (compiled
with gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)).

I have found the problem is in function xen_memory_setup (in
arch/x86/xen/setup.c).

It set max_pfn as 'unsigned long' but add_memory_region()
takes 'unsigned long long'.

I do not know if it is a compiler problem but this is the simple fix
(works on my systems):

--- setup.c.orig	2008-09-13 21:12:56.000000000 +0200
+++ setup.c	2008-09-13 20:35:29.000000000 +0200
@@ -36,7 +36,7 @@

 char * __init xen_memory_setup(void)
 {
-	unsigned long max_pfn = xen_start_info->nr_pages;
+	unsigned long long max_pfn = xen_start_info->nr_pages;

 	e820.nr_map = 0;
 	add_memory_region(0, LOWMEMSIZE(), E820_RAM);

-- 
Roberto De Ioris
http://unbit.it
JID: roberto@...ber.unbit.it

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