linux-kernel - Re: [PATCH v4 0/2] rust: transmute: add `as_bytes(

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Message-ID: <20250728145004.51f10d0b@eugeo>
Date: Mon, 28 Jul 2025 14:50:04 +0100
From: Gary Guo <gary@...yguo.net>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: Abdiel Janulgue <abdiel.janulgue@...il.com>, Danilo Krummrich
 <dakr@...nel.org>, Daniel Almeida <daniel.almeida@...labora.com>, Robin
 Murphy <robin.murphy@....com>, Andreas Hindborg <a.hindborg@...nel.org>,
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Boqun
 Feng <boqun.feng@...il.com>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, Alice Ryhl
 <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, "Christian S.
 Lima" <christiansantoslima21@...il.com>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 0/2] rust: transmute: add `as_bytes(_mut)` methods
 for `AsBytes` trait

On Mon, 28 Jul 2025 21:47:50 +0900
Alexandre Courbot <acourbot@...dia.com> wrote:

> This is the sister patch of [1], providing an `as_bytes` method for
> `AsBytes`, and an `as_bytes_mut` accessor for types also implementing
> `FromBytes`.
> 
> It is going to be used in Nova, but should also be universally useful -
> if anything, it felt a bit strange that `AsBytes` did not provide this
> so far.
> 
> [1] https://lore.kernel.org/rust-for-linux/20250624042802.105623-1-christiansantoslima21@gmail.com/
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
> Changes in v4:
> - Add the `as_bytes_mut` method for types also implementing `FromBytes`.
>   (thanks Alice!)
> - Link to v3: https://lore.kernel.org/r/20250726-as_bytes-v3-1-eb7514faab28@nvidia.com
> 
> Changes in v3:
> - Use `ptr::from_ref` instead of `as *const T`.
> - Link to v2: https://lore.kernel.org/r/20250725-as_bytes-v2-1-c6584c211a6c@nvidia.com
> 
> Changes in v2:
> - Use `size_of_val` to provide a default implementation for both `Sized`
>   and non-`Sized` types, and remove `AsBytesSized`. (thanks Alice!)
> - Link to v1: https://lore.kernel.org/r/20250725-as_bytes-v1-1-6f06a3744f69@nvidia.com
> 
> ---
> Alexandre Courbot (2):
>       rust: transmute: add `as_bytes` method for `AsBytes` trait
>       rust: transmute: add `as_bytes_mut` method to `AsBytes` trait
> 
>  rust/kernel/transmute.rs | 24 +++++++++++++++++++++++-
>  1 file changed, 23 insertions(+), 1 deletion(-)
> ---
> base-commit: 14ae91a81ec8fa0bc23170d4aa16dd2a20d54105
> change-id: 20250725-as_bytes-6cbc11f2e8c3
> 
> Best regards,

Reviewed-by: Gary Guo <gary@...yguo.net>