linux-kernel - Re: [PATCH v6 RESEND 4/7] rust: io: factor common I/O helpers into Io trait

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Message-ID: <20251117191427.2923aebb.zhiw@nvidia.com>
Date: Mon, 17 Nov 2025 19:14:27 +0200
From: Zhi Wang <zhiw@...dia.com>
To: Tamir Duberstein <tamird@...il.com>
CC: Alice Ryhl <aliceryhl@...gle.com>, <rust-for-linux@...r.kernel.org>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dakr@...nel.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>
Subject: Re: [PATCH v6 RESEND 4/7] rust: io: factor common I/O helpers into
 Io trait

On Fri, 14 Nov 2025 13:53:01 -0500
Tamir Duberstein <tamird@...il.com> wrote:

> On Fri, Nov 14, 2025 at 12:37 PM Zhi Wang <zhiw@...dia.com> wrote:
> >

snip

> 
> What about using an associated Err type? In the infallible case, it
> would be `core::convert::Infallible`. It would be slightly more
> ergonomic if associated type defaults were stable[0], though.
> 
> [0] https://github.com/rust-lang/rust/issues/29661

Thanks, Tamir. From Alice's and Danilo’s discussion, it seems we’ll keep
the fallible and infallible traits separate for now.

Still, I really like the idea of an associated Err type. Thanks for the
trick. :)

Z.