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Message-ID: <4fa15761-7cab-4463-a2ff-717256c67d76@proton.me>
Date: Tue, 02 Jul 2024 06:25:02 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Miguel Ojeda <ojeda@...nel.org>, Wedson Almeida Filho <wedsonaf@...il.com>, Alex Gaynor <alex.gaynor@...il.com>
Cc: Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>, rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH 00/13] Support several Rust toolchain versions

On 01.07.24 20:36, Miguel Ojeda wrote:
> Hi all,
> 
> It is time to start supporting several Rust toolchain versions and thus
> establish a minimum Rust compiler and `bindgen` version.
> 
> For the Rust compiler, we will start with a window of two stable
> releases, and widen it over time. This series keeps the minimum where
> it is (1.78.0), but adds support for the recently released 1.79.0.
> 
> This should already be enough for kernel developers in distributions that
> provide recent Rust compiler versions routinely, such as Arch Linux,
> Debian Unstable (outside the freeze period), Fedora Linux, Gentoo
> Linux (especially the testing channel), Nix (unstable) and openSUSE
> Tumbleweed. A documentation adds the instructions for each of them.
> 
> In addition, Rust for Linux is now being built-tested in Rust's
> pre-merge CI. That is, every change that is attempting to land into the
> Rust compiler is tested against the kernel, and it is merged only if it
> passes -- thanks to the Rust project for that!
> 
> Thus, with the pre-merge CI in place, both projects hope to avoid
> unintentional changes to Rust that break the kernel. This means that,
> in general, apart from intentional changes on their side (that we will
> need to workaround conditionally on our side), the upcoming Rust compiler
> versions should generally work.
> 
> For instance, currently, the beta (1.80.0) and nightly (1.81.0) branches
> work as well.
> 
> Similarly, we kept the minimum as it is for `bindgen`. `bindgen` is also
> adding the kernel to its CI -- thanks!
> 
> Cheers,
> Miguel
> 
> 
> Miguel Ojeda (13):
>   rust: macros: indent list item in `paste!`'s docs
>   rust: init: simplify from `map_err` to `inspect_err`
>   rust: allow `dead_code` for never constructed bindings
>   rust: relax most deny-level lints to warnings
>   rust: simplify Clippy warning flags set
>   rust: start supporting several compiler versions
>   rust: warn about `bindgen` versions 0.66.0 and 0.66.1
>   rust: work around `bindgen` 0.69.0 issue
>   rust: avoid assuming a particular `bindgen` build
>   rust: start supporting several `bindgen` versions
>   kbuild: rust: add `rustc-version` support
>   rust: support the new `-Zub-checks` flag
>   docs: rust: quick-start: add section on Linux distributions
> 
>  Documentation/process/changes.rst  |   9 +--
>  Documentation/rust/quick-start.rst | 118 +++++++++++++++++++++++------
>  Makefile                           |  29 +++----
>  init/Kconfig                       |  11 ++-
>  lib/Kconfig.debug                  |  18 +++++
>  rust/Makefile                      |   4 +-
>  rust/bindings/lib.rs               |   1 +
>  rust/kernel/init.rs                |  12 +--
>  rust/macros/lib.rs                 |   2 +-
>  rust/uapi/lib.rs                   |   1 +
>  scripts/Kconfig.include            |   6 ++
>  scripts/Makefile.compiler          |   4 +
>  scripts/rust_is_available.sh       |  20 ++---
>  scripts/rust_is_available_test.py  |  40 +++++-----
>  scripts/rustc-version.sh           |  52 +++++++++++++
>  15 files changed, 238 insertions(+), 89 deletions(-)
>  create mode 100755 scripts/rustc-version.sh
> 
> 
> base-commit: f2661062f16b2de5d7b6a5c42a9a5c96326b8454
> --
> 2.45.2

I applied the series and successfully ran the kunit tests on nixos.
I tried the following rust versions via fenix:
- rustc 1.78.0 (9b00956e5 2024-04-29)
- rustc 1.79.0 (129f3b996 2024-06-10)
- 1.80.0-beta.4 (64a1fe671 2024-06-21)
- 1.81.0-nightly (6868c831a 2024-06-30)

My bindgen version is 0.69.4.

Everything worked as expected :)

Tested-by: Benno Lossin <benno.lossin@...ton.me>

---
Cheers,
Benno


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