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We track the details of which Rust features we use at our usual "live list" [1] (and its sub-lists), but in light of a discussion in the LWN article [2], it would help to clarify it in the source code. In particular, we are very close to rely only on stable Rust language-wise -- essentially only two language features remain (including the `kernel` crate). Thus add some details in both the feature list of the `kernel` crate as well as the list of allowed features. This does not over every single feature, and there are quite a few non-language features that we use too. To have the full picture, please refer to [1]. Link: https://github.com/Rust-for-Linux/linux/issues/2 [1] Link: https://lwn.net/Articles/1015409/ [2] Suggested-by: Andreas Hindborg <a.hindborg@kernel.org> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Link: https://lore.kernel.org/r/20250327211302.286313-1-ojeda@kernel.org [ Improved comments with suggestions from the list. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>