From: Andi Kleen <ak@suse.de>
Date: Mon, 4 Feb 2008 15:48:09 +0000 (+0100)
Subject: x86: add gbpages support to lookup_address
X-Git-Tag: v2.6.25-rc1~1057^2~7
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c2f71ee2140b2a506735ff9fcb7e3b1dfaab8f2b;p=linux-2.6

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>
---

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 9be684e61d..143fbafc94 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;