linux-kernel - Re: [PATCH v3] rust: macros: improve `#[vtable]` documentation

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Message-ID: <87bkcf6yst.fsf@samsung.com>
Date:   Tue, 31 Oct 2023 07:22:59 +0000
From:   Andreas Hindborg <a.hindborg@...sung.com>
To:     Benno Lossin <benno.lossin@...ton.me>
CC:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Martin Rodriguez Reboredo <yakoyoku@...il.com>,
        "Asahi Lina" <lina@...hilina.net>,
        Sven Van Asbroeck <thesven73@...il.com>,
        "Viktor Garske" <viktor@...ar.de>, Finn Behrens <me@...enk.dev>,
        "rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] rust: macros: improve `#[vtable]` documentation


Benno Lossin <benno.lossin@...ton.me> writes:

> Traits marked with `#[vtable]` need to provide default implementations
> for optional functions. The C side represents these with `NULL` in the
> vtable, so the default functions are never actually called. We do not
> want to replicate the default behavior from C in Rust, because that is
> not maintainable. Therefore we should use `build_error` in those default
> implementations. The error message for that is provided at
> `kernel::error::VTABLE_DEFAULT_ERROR`.
>
> Signed-off-by: Benno Lossin <benno.lossin@...ton.me>

Reviewed-by: Andreas Hindborg <a.hindborg@...sung.com>