From: Alice Ryhl <aliceryhl@google.com>
To: Alexandre Courbot <acourbot@nvidia.com>
Cc: "Danilo Krummrich" <dakr@kernel.org>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Joel Fernandes" <joelagnelf@nvidia.com>,
"Yury Norov" <yury.norov@gmail.com>,
"Jesung Yang" <y.j3ms.n@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"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>,
linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org
Subject: Re: [PATCH v2 1/2] rust: add BitInt integer wrapping type
Date: Mon, 3 Nov 2025 10:17:48 +0000 [thread overview]
Message-ID: <aQiBTOj1jl4xM3pJ@google.com> (raw)
In-Reply-To: <20251102-bounded_ints-v2-1-7ef0c26b1d36@nvidia.com>
On Sun, Nov 02, 2025 at 11:24:42PM +0900, Alexandre Courbot wrote:
> Add the `BitInt` type, which is an integer on which the number of bits
> allowed to be used is restricted, capping its maximal value below that
> of primitive type is wraps.
>
> This is useful to e.g. enforce guarantees when working with bit fields.
>
> Alongside this type, provide many `From` and `TryFrom` implementations
> are to reduce friction when using with regular integer types. Proxy
> implementations of common integer traits are also provided.
>
> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
> + // Statically assert that `VALUE` fits within the set number of bits.
> + const {
> + build_assert!(fits_within!(VALUE, $type, NUM_BITS));
> + }
Since it's in a const block, this can just be an assert!.
Alice
next prev parent reply other threads:[~2025-11-03 10:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-02 14:24 [PATCH v2 0/2] rust: add BitInt type and use in Nova's bitfield macro Alexandre Courbot
2025-11-02 14:24 ` [PATCH v2 1/2] rust: add BitInt integer wrapping type Alexandre Courbot
2025-11-03 10:17 ` Alice Ryhl [this message]
2025-11-03 10:49 ` Alice Ryhl
2025-11-03 13:42 ` Alexandre Courbot
2025-11-02 14:24 ` [PATCH FOR REFERENCE v2 2/2] gpu: nova-core: use BitInt for bitfields Alexandre Courbot
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