--- linux-2.6.22.14/arch/powerpc/oprofile/common.c	2008-01-22 13:59:11.000000000 +0200
+++ linux/arch/powerpc/oprofile/common.c	2008-01-21 16:52:31.000000000 +0200
@@ -139,6 +139,8 @@ 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;