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Re: Package for development of out-of-tree kernel modules written in Rust

From NoisyCoil <noisycoil@disroot.org>
Newsgroups linux.debian.kernel
Subject Re: Package for development of out-of-tree kernel modules written in Rust
Date 2025-04-03 23:40 +0200
Message-ID <KxAs2-aRlS-5@gated-at.bofh.it> (permalink)
References (7 earlier) <Kxf4d-aCq3-1@gated-at.bofh.it> <Kxu3f-aMPG-13@gated-at.bofh.it> <Kxwy5-aOvY-1@gated-at.bofh.it> <KxxXb-aPhh-3@gated-at.bofh.it> <KxAil-aRi4-3@gated-at.bofh.it>
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On 03/04/25 23:08, Miguel Ojeda wrote:
> On Thu, Apr 3, 2025 at 8:33 PM Bastian Blank<waldi@debian.org> wrote:
>> What the heck is this good for, where config dependency would be useful?
> C macros in the kernel use the kernel config all the time, why would
> this be different?
> 
> What is the root issue here?

I think the key issue here is Debian wants to support cross-compiling 
out-of-tree kernel modules, but doing so with Rust modules requires one 
to have libmacros.so compiled and packaged for the build architecture, 
which in the context of cross-compilation is different than the target 
architecture. Stuff for the build architecture is config-independent in 
Debian's packaging and should probably remain so, as otherwise one would 
need to build such stuff for every single build architecture + target 
configuration (and arch) combination supported by Debian, which doesn't 
scale up, if at all possible.

The difference with C is C does not compile macros into shared 
libraries, so this issue does not arise. If libmacros.so (and more 
generally, for the future, every proc macro) could be compiled not only 
at kernel build time (which I understand is necessary anyway), but also 
recompiled while the out-of-tree module is being compiled, then this 
issue would not arise for Rust either. One could simply ship the headers 
package without the proc macros, and rebuild the proc macros when needed.

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Package for development of out-of-tree kernel modules written in Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 01:30 +0100
  Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-02-26 12:50 +0100
    Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 13:20 +0100
      Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 14:00 +0100
        Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 15:20 +0100
          Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 19:30 +0100
            Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 22:00 +0100
              Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-27 18:40 +0100
        Re: Package for development of out-of-tree kernel modules written  in Rust Ben Hutchings <ben@decadent.org.uk> - 2025-02-26 19:20 +0100
          Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 19:30 +0100
            Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 20:10 +0100
              Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 20:20 +0100
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-27 18:40 +0100
              Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-02 23:00 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-02 23:30 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-02 23:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-03 00:50 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-03 16:50 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-03 19:30 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-03 21:00 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-03 23:30 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-03 23:40 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-06 23:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-12 18:50 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-13 13:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-13 17:40 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-13 18:40 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-04-13 20:30 +0200
                Re: Package for development of out-of-tree kernel modules written  in Rust Ben Hutchings <ben@decadent.org.uk> - 2025-04-16 17:40 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-05-03 17:10 +0200
                Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-04-04 11:20 +0200
                Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-04-06 23:40 +0200
          Re: Package for development of out-of-tree kernel modules written in Rust Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> - 2025-02-26 19:40 +0100
      Re: Package for development of out-of-tree kernel modules written in  Rust NoisyCoil <noisycoil@disroot.org> - 2025-02-26 14:40 +0100
      Re: Package for development of out-of-tree kernel modules written in  Rust Bastian Blank <waldi@debian.org> - 2025-02-26 14:40 +0100

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