linux-kernel - Re: [PATCH v10 2/5] rust: io: separate generic I/O helpers from MMIO implementation

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Message-Id: <DFTLJCC9IJW2.2UMF3Z6AF6K4W@garyguo.net>
Date: Tue, 20 Jan 2026 17:35:24 +0000
From: "Gary Guo" <gary@...yguo.net>
To: "Zhi Wang" <zhiw@...dia.com>, "Danilo Krummrich" <dakr@...nel.org>
Cc: "Alice Ryhl" <aliceryhl@...gle.com>, <rust-for-linux@...r.kernel.org>,
 <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <bhelgaas@...gle.com>, <kwilczynski@...nel.org>, <ojeda@...nel.org>,
 <alex.gaynor@...il.com>, <boqun.feng@...il.com>, <gary@...yguo.net>,
 <bjorn3_gh@...tonmail.com>, <lossin@...nel.org>, <a.hindborg@...nel.org>,
 <tmgross@...ch.edu>, <markus.probst@...teo.de>, <helgaas@...nel.org>,
 <cjia@...dia.com>, <smitra@...dia.com>, <ankita@...dia.com>,
 <aniketa@...dia.com>, <kwankhede@...dia.com>, <targupta@...dia.com>,
 <acourbot@...dia.com>, <joelagnelf@...dia.com>, <jhubbard@...dia.com>,
 <zhiwang@...nel.org>, <daniel.almeida@...labora.com>
Subject: Re: [PATCH v10 2/5] rust: io: separate generic I/O helpers from
 MMIO implementation

On Tue Jan 20, 2026 at 5:26 PM GMT, Zhi Wang wrote:
> On Tue, 20 Jan 2026 11:12:18 +0100
> "Danilo Krummrich" <dakr@...nel.org> wrote:
>
> Hey folks:
>
> Thanks for the comments and RBs! Agreed. I will adopt this approach in
> v11: using a single series of IoCapable<T> traits and retaining
> IoKnownSize.

Thanks a lot for doing all of this.

Best,
Gary


>
> Z.
>
>> On Tue Jan 20, 2026 at 9:04 AM CET, Alice Ryhl wrote:
>> > On Mon, Jan 19, 2026 at 10:22:44PM +0200, Zhi Wang wrote:
>> > Overall looks good to me. Some comments below:
>> >
>> > I still think it would make sense to have `IoCapable<T>:
>> > IoTryCapable<T>`, but it's not a big deal.
>> 
>> I think with this approach it's not necessary to have this requirement.
>> In practice, most impls will have both, but I think it's a good thing
>> that we don't have to have an impl even if not used by any driver, i.e.
>> it helps avoiding dead code.
>> 
>> >> +    /// Infallible 64-bit read with compile-time bounds check.
>> >> +    #[cfg(CONFIG_64BIT)]
>> >> +    fn read64(&self, offset: usize) -> u64
>> >> +    #[cfg(CONFIG_64BIT)]
>> >> +    fn try_read64(&self, offset: usize) -> Result<u64>
>> >
>> > These don't really need cfg(CONFIG_64BIT). You can place that cfg on
>> > impl blocks of IoCapable<u64>.
>> 
>> If you agree with the above, I can fix this up when applying the series.