linux-kernel - Re: [PATCH v2] rust: macros: vtable: fix `HAS_*` redefinition (`gen_const

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Message-ID: <9e9f08b9-5cb1-f4f8-7527-7ae5b1f54ceb@ryhl.io>
Date:   Thu, 3 Aug 2023 21:47:57 +0200
From:   Alice Ryhl <alice@...l.io>
To:     Qingsong Chen <changxian.cqs@...group.com>,
        linux-kernel@...r.kernel.org
Cc:     田洪亮 <tate.thl@...group.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Sergio González Collado <sergio.collado@...il.com>,
        rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v2] rust: macros: vtable: fix `HAS_*` redefinition
 (`gen_const_name`)

On 8/3/23 16:09, Qingsong Chen wrote:
> If we define the same function name twice in a trait (using `#[cfg]`),
> the `vtable` macro will redefine its `gen_const_name`, e.g. this will
> define `HAS_BAR` twice:
> 
> ```rust
>      #[vtable]
>      pub trait Foo {
>          #[cfg(CONFIG_X)]
>          fn bar();
> 
>          #[cfg(not(CONFIG_X))]
>          fn bar(x: usize);
>      }
> ```
> 
> Changelog:
> ----------
> v1 -> v2:
> - Use `BTreeSet` and existing `consts` as suggested by Alice and Gary.
> - Reword commit messages as suggested by Miguel.
> ====================
> 
> Fixes: b44becc5ee80 ("rust: macros: add `#[vtable]` proc macro")
> Signed-off-by: Qingsong Chen <changxian.cqs@...group.com>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>