Index: kernel/arch/ia64/src/asm.S
===================================================================
--- kernel/arch/ia64/src/asm.S	(revision e32e092d6f8bed442ecc81b18af9ef323bc4e650)
+++ kernel/arch/ia64/src/asm.S	(revision 4541ae41d7ce895a89a42a784040f0156fb8e79d)
@@ -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 ;;