--- linux-2.6.26.5/arch/powerpc/oprofile/common.c	2008-09-08 13:40:20.000000000 -0400
+++ linux-2.6.26.5-rb600/arch/powerpc/oprofile/common.c	2008-10-03 15:06:11.127435362 -0400
@@ -170,6 +170,8 @@ static int op_powerpc_create_files(struc
 
 int __init oprofile_arch_init(struct oprofile_operations *ops)
 {
+	ops->backtrace = op_powerpc_backtrace;
+
 	if (!cur_cpu_spec->oprofile_cpu_type)
 		return -ENODEV;