linux-kernel - [160/165] xen/setup: Ignore E820_UNUSABLE when setting 1-1 mappings.

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Message-Id: <20110601081227.779439393@blue.kroah.org>
Date:	Wed, 01 Jun 2011 17:12:10 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [160/165] xen/setup: Ignore E820_UNUSABLE when setting 1-1 mappings.

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
Content-Length: 922
Lines: 28

From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

commit 15bfc094517db2ddf38ca7ed47f3a1c0ad24f7c4 upstream.

When we parse the raw E820, the Xen hypervisor can set "E820_RAM"
to "E820_UNUSABLE" if the mem=X argument is used. As such we
should _not_ consider the E820_UNUSABLE as an 1-1 identity
mapping, but instead use the same case as for E820_RAM.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/xen/setup.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -166,7 +166,7 @@ static unsigned long __init xen_set_iden
 		if (last > end)
 			continue;
 
-		if (entry->type == E820_RAM) {
+		if ((entry->type == E820_RAM) || (entry->type == E820_UNUSABLE)) {
 			if (start > start_pci)
 				identity += set_phys_range_identity(
 						PFN_UP(start_pci), PFN_DOWN(start));


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