Index: kernel/arch/ia64/src/asm.S
===================================================================
--- kernel/arch/ia64/src/asm.S	(revision b22304b650952abb7d44e9230f737b0fa3126c9d)
+++ kernel/arch/ia64/src/asm.S	(revision f93f1689b424f33048541ffe5740a07867076862)
@@ -164,4 +164,7 @@
 	xor r1 = r1, r1
 	
+	/* r2 is defined to hold pcb_ptr - set it to 0 */
+	xor r2 = r2, r2
+	
 	mov loc1 = cr.ifs
 	movl loc2 = PFM_MASK ;;