linux-kernel - [PATCH 1/2] xen/setup: Ignore E820_UNUSABLE when setting 1-1 mappings.

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Date:	Wed, 25 May 2011 17:37:35 -0400
From:	Konrad@...pdata.com, Rzeszutek@...pdata.com, Wilk@...pdata.com
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 1/2] xen/setup: Ignore E820_UNUSABLE when setting 1-1 mappings.

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

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>
---
 arch/x86/xen/setup.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 90bac0a..fba4a6c 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -166,7 +166,7 @@ static unsigned long __init xen_set_identity(const struct e820entry *list,
 		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));
-- 
1.7.4.1

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