linux-kernel - Re: [PATCH 07/11] rust: io: add from_raw

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Message-Id: <3ad271f7-12e3-4e92-82eb-cd8cd5dbd703@app.fastmail.com>
Date: Fri, 09 May 2025 07:45:58 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Andrew Ballance" <andrewjballance@...il.com>,
 "Danilo Krummrich" <dakr@...nel.org>, "Dave Airlie" <airlied@...il.com>,
 "Simona Vetter" <simona@...ll.ch>,
 "Andrew Morton" <akpm@...ux-foundation.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>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Rafael J . Wysocki" <rafael@...nel.org>, bhelgaas@...gle.com,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 "Raag Jadav" <raag.jadav@...el.com>,
 "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>, me@...enk.dev,
 "FUJITA Tomonori" <fujita.tomonori@...il.com>, daniel.almeida@...labora.com
Cc: "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 07/11] rust: io: add from_raw_cookie functions

On Fri, May 9, 2025, at 05:15, Andrew Ballance wrote:

> +}
> +#[cfg(not(CONFIG_GENERIC_IOMAP))]
> +mod io_backend {
> +    // for everyone who does not use generic iomap
> +    // except for alpha and parisc, neither of which has a rust compiler,
> +    // ioread/iowrite is defined in `include/asm-generic/io.h`.

I think you should special-case x86 here then. The GENERIC_IOMAP
variant is likely to need another hack for powernv to actually work.

Hopefully we won't have to support m68k/q40 here.

     Arnd