linux-kernel - Re: [PATCH 1/1] rust: macros: fix redefine const

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Date:   Thu, 3 Aug 2023 14:52:18 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Qingsong Chen <changxian.cqs@...group.com>
Cc:     Gary Guo <gary@...yguo.net>, Alice Ryhl <aliceryhl@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>, alex.gaynor@...il.com,
        benno.lossin@...ton.me, bjorn3_gh@...tonmail.com,
        boqun.feng@...il.com, linux-kernel@...r.kernel.org,
        rust-for-linux@...r.kernel.org, sergio.collado@...il.com,
        田洪亮 <tate.thl@...group.com>,
        wedsonaf@...il.com
Subject: Re: [PATCH 1/1] rust: macros: fix redefine const_name in `vtable`

On Thu, Aug 3, 2023 at 11:20 AM Qingsong Chen
<changxian.cqs@...group.com> wrote:
>
> According to the suggestions of Alice and Gary, we could do the fix
> like this:

Could you please send a v2?

I removed the patch from `rust-fixes`, this is the reworded commit
message I used, in case you want to take a look / reuse it (of course,
updating it for v2 as needed):

    rust: macros: vtable: fix `HAS_*` redefinition (`gen_const_name`)

    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);
        }
    ```

    Use `HashSet` to avoid this.

Thanks!

Cheers,
Miguel