linux-kernel - Re: [PATCH v5 3/4] rust: add bitmap API.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CANiq72=rbA-Tie7JPY8rj5c5iHBqV0oYZvx5AX7UAJvp1ER7MA@mail.gmail.com>
Date: Fri, 28 Mar 2025 10:06:20 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: David Gow <davidgow@...gle.com>
Cc: Yury Norov <yury.norov@...il.com>, Burak Emir <bqe@...gle.com>, 
	Rasmus Villemoes <linux@...musvillemoes.dk>, Viresh Kumar <viresh.kumar@...aro.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/4] rust: add bitmap API.

On Fri, Mar 28, 2025 at 9:51 AM David Gow <davidgow@...gle.com> wrote:
>
> KUnit. That being said, I suspect that supporting the "just build this
> one test module against your existing kernel" case is going to be a
> bit more of a pain here anyway, as it might end up depending on having
> exactly the same toolchain/config/etc due to Rust's ABI not being
> stable. (Am I missing anything here, Miguel?) And, of course, Rust's
> built-in tests here would get automatically compiled down to KUnit
> tests if enabled.

The ABI is not stable indeed, and modules need to be built with the
same toolchain.

> So, what I suspect you're looking for here is a separate module /
> crate which benchmarks the bitmap type. With the way Rust crates are
> laid out, I suspect this would need to live in a separate directory
> and look something like samples/rust/rust_minimal.rs?

Yeah, the module Yury mentioned seems like a normal one that calls
`ktime_get()` etc., so doing something like that in Rust should be
fine too.

But, yeah, I was thinking more in terms of having a proper framework
for those, rather than doing a custom thing per module and even having
those `ktime_get()` calls manually placed for every test etc.

Thanks for the context!

Cheers,
Miguel