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>

1 files changed, 5 insertions, 0 deletions

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;