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From:   Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Date:   Mon, 13 Feb 2023 14:19:38 +0100
Message-ID: <CANiq72=FZtNmYvbb-YPHmQ=bm8rH8VO3M9nemT4i03g9A2PD2Q@mail.gmail.com>
Subject: Re: [PATCH] rust: fix regexp in scripts/is_rust_module.sh
To:     Andrea Righi <andrea.righi@canonical.com>,
        Eric Curtin <ecurtin@redhat.com>, Daniel Xu <dxu@dxuuu.xyz>,
        Martin Reboredo <yakoyoku@gmail.com>
Cc:     Miguel Ojeda <ojeda@kernel.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        bjorn3_gh@protonmail.com, rust-for-linux@vger.kernel.org,
        linux-kernel@vger.kernel.org
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On Fri, Feb 10, 2023 at 4:26 PM Andrea Righi <andrea.righi@canonical.com> wrote:
>
> nm can use "R" or "r" to show read-only data sections, but
> scripts/is_rust_module.sh can only recognize "r", so with some versions
> of binutils it can fail to detect if a module is a Rust module or not.

Do you know which versions? If so, it would be nice to document it here.

> Moreover, with this patch applied I can also relax the constraint of
> "RUST depends on !DEBUG_INFO_BTF" and build a kernel with Rust and BTF
> enabled at the same time (of course BTF generation is still skipped for
> Rust modules).

Even if that build succeeds, can you load the modules? i.e. the
constraint was there due to
https://github.com/Rust-for-Linux/linux/issues/735.

Also Cc'ing Daniel, Eric and Martin since they are the ones working on this.

Cheers,
Miguel