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This second one should be a bit more exhaustive, thanks to the use of macros to generate the const conversion functions. Using the `as` operator for integer conversions is discouraged, as it silently strips data if the destination type is smaller than the source. Many such conversions can be replaced with `from`/`into` or (when justified) `try_from`/`try_into`, but these traits cannot unfortunately cover all conversions satisfyingly. There is for instance the case of converting a `usize` to `u64`, which, in the case of the kernel today, is completely lossless but cannot be done because the Rust standard library does not provide a `From` implementation for conversions that are not future-proof. Still, in the kernel it is very practical to be able to perform such conversions when they are safe to do for the current build target. This patchset tries to eradicate the use of `as` in nova-core, by using existing means and introducing new ones. The first 4 patches use the already-available `From` and `TryFrom` trait where it is possible or advisable. The fifth patch introduces a new module that proposes conversion functions for those that are infallible under the current build target. This is done through a set of const functions, and the `FromAs` and `IntoAs` extension traits which, as their names lightly suggest, offer conversion for those types on which the `as` operator can be used losslessly. This new module is put to use in the sixth patch. The idea was first suggested by Danilo, and I hope I captured it properly. :) As Danilo suggested, this could eventually find its place in the kernel crate if the implementation is deemed to be fit, but for now let's review and let it mature in nova-core. Suggested-by: Danilo Krummrich Link: https://lore.kernel.org/rust-for-linux/DDK4KADWJHMG.1FUPL3SDR26XF@kernel.org/ Signed-off-by: Alexandre Courbot --- Changes in v2: - Use macro to generate const conversion functions. - Use `CAST:` comments to justify remaining `as` conversions. - Add more conditional compilation guards. - Link to v1: https://lore.kernel.org/r/20251026-nova-as-v1-0-60c78726462d@nvidia.com --- Alexandre Courbot (7): gpu: nova-core: replace `as` with `from` conversions where possible gpu: nova-core: vbios: remove unneeded u8 conversions gpu: nova-core: vbios: add conversion to u8 for BiosImageType gpu: nova-core: use `try_from` instead of `as` for u32 conversions gpu: nova-core: add extra integer conversion functions and traits gpu: nova-core: replace use of `as` with functions from `num` gpu: nova-core: justify remaining uses of `as` drivers/gpu/nova-core/falcon.rs | 9 +- drivers/gpu/nova-core/falcon/hal/ga102.rs | 6 +- drivers/gpu/nova-core/fb.rs | 7 +- drivers/gpu/nova-core/fb/hal/ga100.rs | 4 + drivers/gpu/nova-core/fb/hal/tu102.rs | 16 ++- drivers/gpu/nova-core/firmware.rs | 7 +- drivers/gpu/nova-core/firmware/booter.rs | 31 +++--- drivers/gpu/nova-core/firmware/fwsec.rs | 25 ++--- drivers/gpu/nova-core/firmware/gsp.rs | 5 +- drivers/gpu/nova-core/firmware/riscv.rs | 7 +- drivers/gpu/nova-core/nova_core.rs | 1 + drivers/gpu/nova-core/num.rs | 158 ++++++++++++++++++++++++++++++ drivers/gpu/nova-core/regs.rs | 5 +- drivers/gpu/nova-core/vbios.rs | 60 +++++++----- 14 files changed, 262 insertions(+), 79 deletions(-) --- base-commit: ca16b15e78f4dee1631c0a68693f5e7d9b3bb3ec change-id: 20251022-nova-as-8ece4142872a Best regards, -- Alexandre Courbot