Avoid pushing the region id into the PGD offset.

Signed-off-by: Christoph Lameter <clameter@sgi.com>

Index: linux-2.6.18-mm3/arch/ia64/kernel/ivt.S
===================================================================
--- linux-2.6.18-mm3.orig/arch/ia64/kernel/ivt.S	2006-10-09 13:40:26.320584078 -0700
+++ linux-2.6.18-mm3/arch/ia64/kernel/ivt.S	2006-10-09 13:44:13.213823817 -0700
@@ -435,10 +435,10 @@ ENTRY(nested_dtlb_miss)
 	cmp.eq p6,p7=5,r17			// is faulting address in region 5?
 	;;
 	add r22=-PAGE_SHIFT,r18			// adjustment for hugetlb address
-	add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
+	add r18=PGDIR_SHIFT-PAGE_SHIFT+3,r18
 	;;
 	shr.u r22=r16,r22
-	shr.u r18=r16,r18
+	shr.u r18=r21,r18
 (p7)	dep r17=r17,r19,(PAGE_SHIFT-3),3	// put region number bits in place
 
 	srlz.d