tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: Apache-2.0 OR MIT
2
3use pin_init::*;
4
5// Struct with size over 1GiB
6#[derive(Debug)]
7pub struct BigStruct {
8 buf: [u8; 1024 * 1024 * 1024],
9 a: u64,
10 b: u64,
11 c: u64,
12 d: u64,
13 managed_buf: ManagedBuf,
14}
15
16#[derive(Debug)]
17pub struct ManagedBuf {
18 buf: [u8; 1024 * 1024],
19}
20
21impl ManagedBuf {
22 pub fn new() -> impl Init<Self> {
23 init!(ManagedBuf { buf <- zeroed() })
24 }
25}
26
27fn main() {
28 // we want to initialize the struct in-place, otherwise we would get a stackoverflow
29 let buf: Box<BigStruct> = Box::init(init!(BigStruct {
30 buf <- zeroed(),
31 a: 7,
32 b: 186,
33 c: 7789,
34 d: 34,
35 managed_buf <- ManagedBuf::new(),
36 }))
37 .unwrap();
38 println!("{}", core::mem::size_of_val(&*buf));
39}