Index: linux-2.6.16-rc1/include/asm-ia64/pgtable.h
===================================================================
--- linux-2.6.16-rc1.orig/include/asm-ia64/pgtable.h	2006-01-16 23:44:47.000000000 -0800
+++ linux-2.6.16-rc1/include/asm-ia64/pgtable.h	2006-04-06 10:39:34.000000000 -0700
@@ -267,8 +267,9 @@ ia64_phys_addr_valid (unsigned long addr
 	(__pte((pte_val(_pte) & ~_PAGE_CHG_MASK) | (pgprot_val(newprot) & _PAGE_CHG_MASK)))
 
 #define pte_none(pte) 			(!pte_val(pte))
-#define pte_present(pte)		(pte_val(pte) & (_PAGE_P | _PAGE_PROTNONE))
+#define pte_present(pte)		(pte_val(pte) & _PAGE_PROTNONE)
 #define pte_clear(mm,addr,pte)		(pte_val(*(pte)) = 0UL)
+#define pte_off(pte)			((pte_val(pte) & (_PAGE_P | _PAGE_PROTNONE) == _PAGE_PROTNONE)
 /* pte_page() returns the "struct page *" corresponding to the PTE: */
 #define pte_page(pte)			virt_to_page(((pte_val(pte) & _PFN_MASK) + PAGE_OFFSET))
 
@@ -443,6 +444,16 @@ ptep_set_wrprotect(struct mm_struct *mm,
 #endif
 }
 
+static inline ptep_off(pte_t *ptep)
+{
+	clear_bit(ptep, _PAGE_P);
+}
+
+static inline ptep_on(pte_t *ptep)
+{
+	set_bit(ptep, _PAGE_P);
+}
+
 static inline int
 pte_same (pte_t a, pte_t b)
 {
Index: linux-2.6.16-rc1/arch/ia64/Kconfig
===================================================================
--- linux-2.6.16-rc1.orig/arch/ia64/Kconfig	2006-01-16 23:44:47.000000000 -0800
+++ linux-2.6.16-rc1/arch/ia64/Kconfig	2006-04-06 10:40:15.000000000 -0700
@@ -338,6 +338,9 @@ config HAVE_ARCH_EARLY_PFN_TO_NID
 	def_bool y
 	depends on NEED_MULTIPLE_NODES
 
+config HAVE_PTE_OFF
+	def_bool y
+
 config IA32_SUPPORT
 	bool "Support for Linux/x86 binaries"
 	help