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

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Message-ID: <aW93LS71i01F8FLA@google.com>
Date: Tue, 20 Jan 2026 12:38:05 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Zhi Wang <zhiw@...dia.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 11:26:04AM +0000, Alice Ryhl wrote:
> On Tue, Jan 20, 2026 at 11:12:18AM +0100, Danilo Krummrich wrote:
> > 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.
> 
> Ok with me.

with cfg(CONFIG_64BIT) adjusted:
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>