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From: Alice Ryhl <aliceryhl@google.com>
To: Alexandre Courbot <acourbot@nvidia.com>
Cc: "Danilo Krummrich" <dakr@kernel.org>,
	"Daniel Almeida" <daniel.almeida@collabora.com>,
	"Miguel Ojeda" <ojeda@kernel.org>, "Gary Guo" <gary@garyguo.net>,
	"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
	"Benno Lossin" <lossin@kernel.org>,
	"Andreas Hindborg" <a.hindborg@kernel.org>,
	"Trevor Gross" <tmgross@umich.edu>,
	"Boqun Feng" <boqun@kernel.org>,
	"Yury Norov" <yury.norov@gmail.com>,
	"John Hubbard" <jhubbard@nvidia.com>,
	"Alistair Popple" <apopple@nvidia.com>,
	"Joel Fernandes" <joelagnelf@nvidia.com>,
	"Timur Tabi" <ttabi@nvidia.com>, "Edwin Peer" <epeer@nvidia.com>,
	"Eliot Courtney" <ecourtney@nvidia.com>,
	"Dirk Behme" <dirk.behme@de.bosch.com>,
	"Steven Price" <steven.price@arm.com>,
	rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 4/9] rust: num: make Bounded::get const
Date: Mon, 16 Feb 2026 08:56:49 +0000	[thread overview]
Message-ID: <aZLb0VcA3oZLfYvr@google.com> (raw)
In-Reply-To: <20260216-register-v6-4-eec9a4de9e9e@nvidia.com>

On Mon, Feb 16, 2026 at 05:04:40PM +0900, Alexandre Courbot wrote:
> There is a need to access the inner value of a `Bounded` in const
> context, notably for bitfields and registers. Remove the invariant check
> of `Bounded::get`, which allows us to make it const.
> 
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
> ---
>  rust/kernel/num/bounded.rs | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/rust/kernel/num/bounded.rs b/rust/kernel/num/bounded.rs
> index 8e4c08924d96..b09b93cd0c5c 100644
> --- a/rust/kernel/num/bounded.rs
> +++ b/rust/kernel/num/bounded.rs
> @@ -379,6 +379,9 @@ pub fn from_expr(expr: T) -> Self {
>  
>      /// Returns the wrapped value as the backing type.
>      ///
> +    /// This is similar to the [`Deref`] implementation, but doesn't enforce the size invariant of
> +    /// the [`Bounded`], which might produce slightly less optimal code.

The unreachable_unchecked() hint is const, so I see no reason you
couldn't add the same call in `fn get`.

Alice

  reply	other threads:[~2026-02-16  8:56 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-16  8:04 [PATCH v6 0/9] rust: add `register!` macro Alexandre Courbot
2026-02-16  8:04 ` [PATCH v6 1/9] rust: enable the `generic_arg_infer` feature Alexandre Courbot
2026-02-16  8:04 ` [PATCH v6 2/9] rust: num: add `shr` and `shl` methods to `Bounded` Alexandre Courbot
2026-02-16  8:55   ` Alice Ryhl
2026-02-16  8:04 ` [PATCH v6 3/9] rust: num: add `into_bool` method " Alexandre Courbot
2026-02-16  8:04 ` [PATCH v6 4/9] rust: num: make Bounded::get const Alexandre Courbot
2026-02-16  8:56   ` Alice Ryhl [this message]
2026-02-16  9:16     ` Gary Guo
2026-02-16  8:04 ` [PATCH v6 5/9] rust: io: add IoRef and IoWrite types Alexandre Courbot
2026-02-16  9:01   ` Alice Ryhl
2026-02-16  9:36     ` Alexandre Courbot
2026-02-16 10:35       ` Alice Ryhl
2026-02-16 10:52         ` Alexandre Courbot
2026-02-20  6:38           ` Alexandre Courbot
2026-02-20  8:18             ` Alice Ryhl
2026-02-20 14:45               ` Alexandre Courbot
2026-02-21  8:43                 ` Alice Ryhl
2026-02-16  8:04 ` [PATCH v6 6/9] rust: io: use generic read/write accessors for primitive accesses Alexandre Courbot
2026-02-16  8:04 ` [PATCH v6 7/9] rust: io: add `register!` macro Alexandre Courbot
2026-02-16  8:04 ` [PATCH v6 8/9] sample: rust: pci: use " Alexandre Courbot
2026-02-16  8:04 ` [PATCH FOR REFERENCE v6 9/9] gpu: nova-core: use the kernel " Alexandre Courbot
2026-02-20 13:20 ` [PATCH v6 0/9] rust: add " Dirk Behme
2026-02-22 13:25   ` Alexandre Courbot

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