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Message-Id: <20250908-num-v5-0-c0f2f681ea96@nvidia.com>
Date: Mon, 08 Sep 2025 22:25:53 +0900
From: Alexandre Courbot <acourbot@...dia.com>
To: 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>,
Danilo Krummrich <dakr@...nel.org>
Cc: linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
nouveau@...ts.freedesktop.org, Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v5 0/2] rust: add `Alignment` type
The first patch makes two additions:
- Bring an equivalent of the nightly upstream `Alignment` type [1] with
an near-identical public interface,
- Add a new `Alignable` extension trait that provides a way to align
values up or down according to an `Alignment`, and implement it on
unsigned integer types.
The second patch makes use of these in the Nova driver.
[1] https://doc.rust-lang.org/std/ptr/struct.Alignment.html
Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
Changes in v5:
- Update doccomments a bit.
- Use a const generic instead of a regular argument for the const
constructor.
- Link to v4: https://lore.kernel.org/r/20250821-num-v4-0-1f3a425d7244@nvidia.com
Changes in v4:
- Add the `generic_nonzero` feature (stabilized in Rust 1.79) to fix
build with Rust 1.78.
- Import `core::mem::align_of` for older Rust versions (as the patch
adding it to the prelude is not attainable from nova-next yet).
- Link to v3: https://lore.kernel.org/r/20250812-num-v3-0-569d6fe1839f@nvidia.com
Changes in v3:
- Move `align_down` and `align_up` into their own `Alignable` trait.
(thanks Miguel!)
- Fix `Alignment::mask` implementation to match upstream's.
- Add missing `SAFETY:` comments.
- Improve grammar on a few hard-to-parse comments.
- Link to v2: https://lore.kernel.org/r/20250804-num-v2-0-a96b9ca6eb02@nvidia.com
Changes in v2:
- Remove `last_checked_bit` (use Rust's `checked_ilog2` instead).
- Port Rust nightly `Alignment` type and extend it with `align_down` and
`align_up` methods.
- Link to v1: https://lore.kernel.org/r/20250620-num-v1-0-7ec3d3fb06c9@nvidia.com
Changes since split from the nova-core series:
- Rename `fls` to `last_set_bit`,
- Generate per-type doctests,
- Add invariants section to `PowerOfTwo`.
- Do not use reference to `self` in `PowerOfTwo` methods since it
implements `Copy`,
- Use #[derive] where possible instead of implementing traits
manually,
- Remove `Deref` and `Borrow` implementations.
---
Alexandre Courbot (2):
rust: add `Alignment` type
gpu: nova-core: use Alignment for alignment-related operations
Documentation/gpu/nova/core/todo.rst | 1 -
drivers/gpu/nova-core/fb.rs | 6 +-
drivers/gpu/nova-core/vbios.rs | 4 +-
rust/kernel/lib.rs | 2 +
rust/kernel/ptr.rs | 226 +++++++++++++++++++++++++++++++++++
5 files changed, 233 insertions(+), 6 deletions(-)
---
base-commit: 062b3e4a1f880f104a8d4b90b767788786aa7b78
change-id: 20250620-num-9420281c02c7
prerequisite-message-id: <20250808-falcondma_256b-v1-1-15f911d89ffd@...dia.com>
prerequisite-patch-id: 2439f5f9b560ee4867716f0018b5326dcd72cda3
Best regards,
--
Alexandre Courbot <acourbot@...dia.com>
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