linux-kernel - Re: [PATCH] rust: bindings: rename const binding using sed

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Date:   Sun, 1 Oct 2023 14:12:23 +0200
From:   Alice Ryhl <alice@...l.io>
To:     Gary Guo <gary@...yguo.net>
Cc:     Wedson Almeida Filho <walmeida@...rosoft.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>,
        Vincenzo Palazzo <vincenzopalazzodev@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH] rust: bindings: rename const binding using sed

On 9/30/23 15:36, Gary Guo wrote:
> Current for consts that bindgen don't recognise, we define a helper
> constant with
> 
>      const <TYPE> BINDINGS_<NAME> = <NAME>;
> 
> in `bindings_helper.h` and then we put
> 
>      pub const <NAME>: <TYPE> = BINDINGS_<NAME>;
> 
> in `bindings/lib.rs`. This is fine that we currently only have 3
> constants that are defined this way, but is going to be more annoying
> when more constants are added since every new constant needs to be
> defined in two places.
> 
> This patch changes the way we define constant helpers to
> 
>      const <TYPE> RUST_BINDING_<NAME> = <NAME>;
> 
> and then use `sed` to postprocess Rust code by generated by bindgen to
> remove the distinct prefix, so user of the binding crate can refer to
> the name directly.

Maybe it would make sense to use a less generic name for this sed 
replacement? E.g., maybe RUST_CONST_HELPER_ or something that's less 
likely to overlap with things that are not constants.

Alice