linux-kernel - Re: [PATCH v3 05/10] rust: list: add macro for implementing ListItem

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Message-ID: <CAH5fLgg_6o5HTtLc7ngyRsa5gLM2Gtqm=QaBT+oaFjhdZg=O6A@mail.gmail.com>
Date: Wed, 31 Jul 2024 15:03:26 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Miguel Ojeda <ojeda@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>
Cc: 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>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Marco Elver <elver@...gle.com>, Coly Li <colyli@...e.de>, Paolo Abeni <pabeni@...hat.com>, 
	Pierre Gondois <pierre.gondois@....com>, Ingo Molnar <mingo@...nel.org>, 
	Jakub Kicinski <kuba@...nel.org>, Wei Yang <richard.weiyang@...il.com>, 
	Matthew Wilcox <willy@...radead.org>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v3 05/10] rust: list: add macro for implementing ListItem

On Tue, Jul 23, 2024 at 10:23 AM Alice Ryhl <aliceryhl@...gle.com> wrote:
> +#[macro_export]
> +macro_rules! impl_list_item {
> +    (
> +        impl$({$($generics:tt)*})? ListItem<$num:tt> for $t:ty {
> +            using ListLinks;
> +        } $($rest:tt)*

This uses $($rest:tt)* but does not call itself at the end. This means
that trying to use this macro with several impl blocks results in
additional impl blocks being silently swallowed. The macro should use
repetition properly here.

Alice