linux-kernel - Re: [PATCH 1/2] nova-core: Add a library for bitfields in Rust structs

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Message-ID: <307053b6-ce52-45ea-b33b-8ae5f24bf913@kernel.org>
Date: Mon, 25 Aug 2025 12:46:18 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Joel Fernandes <joelagnelf@...dia.com>
Cc: linux-kernel@...r.kernel.org, Alexandre Courbot <acourbot@...dia.com>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 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>,
 John Hubbard <jhubbard@...dia.com>, Alistair Popple <apopple@...dia.com>,
 nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
 rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 1/2] nova-core: Add a library for bitfields in Rust
 structs

On 8/24/25 3:59 PM, Joel Fernandes wrote:
> Add a minimal bitfield library for defining in Rust structures (called
> bitstruct), similar in concept to bit fields in C structs. This will be used
> for defining page table entries and other structures in nova-core.
> 
> Signed-off-by: Joel Fernandes <joelagnelf@...dia.com>
> ---
>   drivers/gpu/nova-core/bitstruct.rs | 149 +++++++++++++++++++++++++++++
>   drivers/gpu/nova-core/nova_core.rs |   1 +
>   2 files changed, 150 insertions(+)
>   create mode 100644 drivers/gpu/nova-core/bitstruct.rs

I think this is much simpler than the register!() macro that we decided to
experiment with and work out within nova-core before making it available as
generic infrastructure.

So, probably this should go under rust/kernel/ directly.

- Danilo