linux-kernel - Re: [RFC PATCH v3 0/2] rust: crates in other kernel directories

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Date: Fri, 15 Mar 2024 14:44:16 +0100
From: Johannes Berg <johannes@...solutions.net>
To: Martin Rodriguez Reboredo <yakoyoku@...il.com>, Miguel Ojeda
 <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Wedson Almeida
 Filho <wedsonaf@...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@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org
Subject: Re: [RFC PATCH v3 0/2] rust: crates in other kernel directories

Hi,

So I realize this is an old patch, but I didn't find another version,
and discussions seemed ongoing at least a month ago. I also came across
it pretty randomly.

Anyway, question:

> If you want to use a crate with your Rust module just add a `rust-libs`
> variable in your Makefile with a value of the relative directory of
> said crate plus its name, e.g.
> 
>     # Link with the foo crate
>     rust-libs += ../path/to/foo

Should this perhaps be relative to the kernel's root dir instead? 

If I'm reading this correctly, then a hypothetical rust wireless driver
that lives in

  drivers/net/wireless/<vendor>/<name>/

using some wireless rust infrastructure would probably end up with
something like

  rust-libs += ../../../../../net/mac80211/rust/

or whatever, which seems rather odd vs.

  rust-libs += net/mac80211/rust/

Seems to me that chances are that subsystems/drivers that have rust
infrastructure will not necessarily have them close to each other, like
in this example?

You have this in the sample too:

+rust-libs					:= ../../drivers/usb/core/usb

but it's less pronounced since it's just samples/rust/ :)

johannes