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Another improvement is that the type invariants are now enforced from a single place. This series provides `BitInt`, a wrapper type for primitive integers that guarantees that only a given number of bits are used to represent values. This is particularly useful when working with bitfields, as the guarantee that a given value fits within the number of assigned bits can be enforced by the type system, saving cumbersome runtime checks, or (worse) stripping data when bits are silently dropped. Don't worry too much about the size; a lot of it is rustdoc. :) For a basic usage, please see the rustdoc of the `BitInt` type on the first patch. The first use of this will be to represent bitfields in Nova register types to guarantee that no data is ever stripped when manipulating them. This should eventually allow the `bitfield` and `register` macros to move out of Nova and into the kernel crate. The second patch is here to illustrate the use of this module; it is not intended to be merged this cycle as it would likely result in big merge conflicts with the drm tree. This series applies on top of drm-rust-next for the needs of the second patch. The first patch should apply cleanly on rust-next. A branch with this series and its dependencies is available here: https://github.com/Gnurou/linux/tree/b4/bounded_ints Signed-off-by: Alexandre Courbot --- Changes in v2: - Move type invariants of `BitInt` to a centralizing private constructor. - Simplify `From` implementations to and from primitive types. - Remove ability to convert between unsigned and signed types as it was buggy, and its utility doubtful. - Use macro to implement `Integer` and avoid repeating code. - Fix a few typos. - More doctests, and split them into different paragraphs in the `BitInt` main doccomment. - Fix build with Rust 1.78. - Finish implementing relevant `core::ops` traits. - Link to v1: https://lore.kernel.org/r/20251031-bounded_ints-v1-0-e2dbcd8fda71@nvidia.com Changes in v1: - Rebase on top of `drm-rust-next`. - Rename `BoundedInt` to `BitInt` (thanks Yury!). - Add lots of documentation. - Use shifts to validate bounds, as it works with both unsigned and signed types contrary to the mask method. - Support signed types (albeit with some bugs). - Use `new` for the const static constructor and make it the preferred way to build values (thanks Alice and Joel!). - Rename `LargerThanX` into `AtLeastX` (thanks Joel!). - Support basic arithmetic operations (+, -, etc.) against the backing type. - Add `Deref` implementation as alternative to the `get` method. - Write correct `Default` implementation for bitfields. - Make the new bitfield accessors `inline(always)`. - Update bitfield documentation to the new usage. - Link to RFC v2: https://lore.kernel.org/r/20251009-bounded_ints-v2-0-ff3d7fee3ffd@nvidia.com Changes in RFC v2: - Thorough implementation of `BoundedInt`. - nova-core fully adapted to use `BoundedInt`. - Link to RFC v1: https://lore.kernel.org/r/20251002-bounded_ints-v1-0-dd60f5804ea4@nvidia.com --- Alexandre Courbot (2): rust: add BitInt integer wrapping type [FOR REFERENCE] gpu: nova-core: use BitInt for bitfields drivers/gpu/nova-core/bitfield.rs | 366 ++++++----- drivers/gpu/nova-core/falcon.rs | 134 ++-- drivers/gpu/nova-core/falcon/hal/ga102.rs | 5 +- drivers/gpu/nova-core/fb/hal/ga100.rs | 3 +- drivers/gpu/nova-core/gpu.rs | 9 +- drivers/gpu/nova-core/regs.rs | 139 ++-- rust/kernel/lib.rs | 1 + rust/kernel/num.rs | 50 ++ rust/kernel/num/bitint.rs | 1001 +++++++++++++++++++++++++++++ 9 files changed, 1405 insertions(+), 303 deletions(-) --- base-commit: 9a3c2f8a4f84960a48c056d0da88de3d09e6d622 change-id: 20251001-bounded_ints-1d0457d9ae26 Best regards, -- Alexandre Courbot