From c2f71ee2140b2a506735ff9fcb7e3b1dfaab8f2b Mon Sep 17 00:00:00 2001
From: Andi Kleen <ak@suse.de>
Date: Mon, 4 Feb 2008 16:48:09 +0100
Subject: [PATCH] x86: add gbpages support to lookup_address

[ tglx@linutronix.de: fix bootup crash on sparse mappings. ]

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/mm/pageattr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 9be684e61dcb..143fbafc948a 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -209,6 +209,11 @@ pte_t *lookup_address(unsigned long address, int *level)
 	pud = pud_offset(pgd, address);
 	if (pud_none(*pud))
 		return NULL;
+
+	*level = PG_LEVEL_1G;
+	if (pud_large(*pud) || !pud_present(*pud))
+		return (pte_t *)pud;
+
 	pmd = pmd_offset(pud, address);
 	if (pmd_none(*pmd))
 		return NULL;
-- 
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