linux-kernel - Re: [PATCH RESEND] rust: transmute: add `from_bytes

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Message-Id: <DE0QHP0YHN2W.2FG5CD7P3A1XA@nvidia.com>
Date: Wed, 05 Nov 2025 20:45:03 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Alexandre Courbot" <acourbot@...dia.com>, "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"
 <lossin@...nel.org>, "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice
 Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>, "Danilo
 Krummrich" <dakr@...nel.org>
Cc: <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] rust: transmute: add `from_bytes_prefix` family
 of methods

On Sat Nov 1, 2025 at 10:41 PM JST, Alexandre Courbot wrote:
> The `from_bytes*` family of functions expect a slice of the exact same
> size as the requested type. This can be sometimes cumbersome for callers
> that deal with dynamic stream of data that needs to be manually cut
> before each invocation of `from_bytes`.
>
> To simplify such callers, introduce a new `from_bytes*_prefix` family of
> methods, which split the input slice at the index required for the
> equivalent `from_bytes` method to succeed, and return its result
> alongside with the remainder of the slice.
>
> This design is inspired by zerocopy's `try_*_from_prefix` family of
> methods.
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
> This patch was part of a minor Nova cleanup series [1], but since it
> requires attention from the core Rust team and is buried under other
> Nova patches, I am taking the freedom to send it separately for
> visibility.
>
> Since the originating series makes use of this, I hope to eventually
> merge it together with it, through the drm-rust tree.
>
> Thanks!
>
> [1] https://lore.kernel.org/all/20251029-nova-vbios-frombytes-v1-0-ac441ebc1de3@nvidia.com/

Pushed along with the rest of the VBIOS series to drm-rust-next, thanks!