x86: unify pud_offset

Impact: cleanup

Unify and demacro pud_offset.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index a51a97a..decccb0 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -506,6 +506,11 @@
 {
 	return (address >> PUD_SHIFT) & (PTRS_PER_PUD - 1);
 }
+
+static inline pud_t *pud_offset(pgd_t *pgd, unsigned long address)
+{
+	return (pud_t *)pgd_page_vaddr(*pgd) + pud_index(address);
+}
 #endif	/* PAGETABLE_LEVELS > 3 */
 
 #endif	/* __ASSEMBLY__ */