linux-kernel - Re: [PATCH v3] rust: macros: vtable: fix `HAS_*` redefinition (`gen_const

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Message-ID: <CANiq72ka691RCpO02jBT9yOX9_jQTe5n-GVG35x7F25B+HdX8Q@mail.gmail.com>
Date:   Wed, 9 Aug 2023 21:28:55 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Qingsong Chen <changxian.cqs@...group.com>
Cc:     linux-kernel@...r.kernel.org,
        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 v3] rust: macros: vtable: fix `HAS_*` redefinition (`gen_const_name`)

On Tue, Aug 8, 2023 at 4:54 AM Qingsong Chen <changxian.cqs@...group.com> 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:
>
>     #[vtable]
>     pub trait Foo {
>         #[cfg(CONFIG_X)]
>         fn bar();
>
>         #[cfg(not(CONFIG_X))]
>         fn bar(x: usize);
>     }
>
> Fixes: b44becc5ee80 ("rust: macros: add `#[vtable]` proc macro")
> Signed-off-by: Qingsong Chen <changxian.cqs@...group.com>

Applied to `rust-fixes`, thanks everyone!

Cheers,
Miguel