You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: buddy.rs
    path of file: ./repos/octox/src/kernel
    
    the code of the file until where you have to start completion: // buddy memory allocator

use crate::list::List;
use core::alloc::Layout;
use core::cmp;
use core::ptr::{self, NonNull};

const fn round_up(n: usize, sz: usize) -> usize {
    (((n - 1) / sz) + 
    
    fn mark_data_structures(&mut self, p: usize) -> usize {
        let meta = p - self.base;
        println!(
            "bd: {} meta bytes for managing {} bytes of memory",
            meta,
            Self::blk_size(self.max_size())
        );
        self.mark(self.base, p);
        meta
    }