linux-kernel - Re: [PATCH 7/7] rust: file: add abstraction for `poll

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Date:   Thu, 30 Nov 2023 14:50:07 -0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Alice Ryhl <aliceryhl@...gle.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...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>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Carlos Llamas <cmllamas@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Kees Cook <keescook@...omium.org>,
        Matthew Wilcox <willy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        rust-for-linux@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 7/7] rust: file: add abstraction for `poll_table`

On Wed, Nov 29, 2023 at 01:12:51PM +0000, Alice Ryhl wrote:
[...]
> +// Make the `CondVar` methods callable on `PollCondVar`.
> +impl Deref for PollCondVar {
> +    type Target = CondVar;
> +
> +    fn deref(&self) -> &CondVar {
> +        &self.inner
> +    }
> +}

I generally think we should avoid using Deref for "subclass pattern" due
to the potential confusion for the code readers (of the deref() usage).
Would it be possible we start with `impl AsRef<CondVar>`?

Thanks!

Regards,
Boqun