linux-kernel - Re: [PATCH v9] rust: transmute: Add methods for FromBytes trait

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Message-Id: <DC906GRT9ESF.2ZV7RUZR0XZEK@nvidia.com>
Date: Fri, 22 Aug 2025 22:49:57 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Miguel Ojeda" <miguel.ojeda.sandonis@...il.com>
Cc: "Christian" <christiansantoslima21@...il.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"
 <benno.lossin@...ton.me>, "Andreas Hindborg" <a.hindborg@...nel.org>,
 "Alice Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
 "Danilo Krummrich" <dakr@...nel.org>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>, <~lkcamp/patches@...ts.sr.ht>,
 <richard120310@...il.com>
Subject: Re: [PATCH v9] rust: transmute: Add methods for FromBytes trait

On Fri Aug 22, 2025 at 5:07 PM JST, Miguel Ojeda wrote:
> On Fri, Aug 22, 2025 at 5:10 AM Alexandre Courbot <acourbot@...dia.com> wrote:
>>
>> The methods making use of this feature are definitely usable by other
>> crates, and can also be inlined by the compiler. Would that be a
>> problem?
>
> No, that is fine.

Strangely though, even after enabling the feature, I am still occasionally getting this warning:

  CLIPPY L rust/kernel.o
warning: current MSRV (Minimum Supported Rust Version) is `1.78.0` but this item is stable since `1.79.0`
  --> rust/kernel/transmute.rs:39:45
   |
39 |         if bytes.len() == size && slice_ptr.is_aligned() {
   |                                             ^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
   = note: `-W clippy::incompatible-msrv` implied by `-W clippy::all`
   = help: to override `-W clippy::all` add `#[allow(clippy::incompatible_msrv)]`

warning: current MSRV (Minimum Supported Rust Version) is `1.78.0` but this item is stable since `1.79.0`
  --> rust/kernel/transmute.rs:57:45
   |
57 |         if bytes.len() == size && slice_ptr.is_aligned() {
   |                                             ^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

warning: 2 warnings emitted