FETCH_OP_RETVAL  1145 kernel/trace/trace_kprobe.c 	case FETCH_OP_RETVAL:
FETCH_OP_RETVAL   281 kernel/trace/trace_probe.c 			code->op = FETCH_OP_RETVAL;
FETCH_OP_RETVAL   236 kernel/trace/trace_uprobe.c 	case FETCH_OP_RETVAL: