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

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Date:   Thu, 26 Oct 2023 18:39:57 -0300
From:   Martin Rodriguez Reboredo <yakoyoku@...il.com>
To:     Benno Lossin <benno.lossin@...ton.me>,
        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>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Alice Ryhl <aliceryhl@...gle.com>,
        Asahi Lina <lina@...hilina.net>,
        Sven Van Asbroeck <thesven73@...il.com>,
        Viktor Garske <viktor@...ar.de>, Finn Behrens <me@...enk.dev>
Cc:     rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] rust: macros: improve `#[vtable]` documentation

On 10/26/23 17:19, Benno Lossin wrote:
> 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>
> ---
> v2 -> v3:
> - don't hide the import of the constant in the example
> - fixed "function" typo
> - improve paragraph about optional functions
> - do not remove the `Send + Sync + Sized` bounds on the example
> 
> v1 -> v2:
> - removed imperative mode in the paragraph describing optional
>    functions.
> 
> [...]
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>