From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Tue, 12 Apr 2011 11:57:15 +0000 (-0400)
Subject: xen/setup: Ignore E820_UNUSABLE when setting 1-1 mappings.
X-Git-Tag: firefly_0821_release~7613^2~1403^4~1
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=15bfc094517db2ddf38ca7ed47f3a1c0ad24f7c4;p=firefly-linux-kernel-4.4.55.git

xen/setup: Ignore E820_UNUSABLE when setting 1-1 mappings.

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@oracle.com>
---

diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 90bac0aac3a5..fba4a6cc3a2d 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));