linux-kernel - Re: [PATCH v3 9/9] rust: file: add abstraction for `poll

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Date: Wed, 24 Jan 2024 10:11:28 +0000
From: Benno Lossin <benno.lossin@...ton.me>
To: Alice Ryhl <aliceryhl@...gle.com>, Miguel Ojeda <ojeda@...nel.org>, 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>, 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>
Cc: 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 v3 9/9] rust: file: add abstraction for `poll_table`

On 18.01.24 15:36, Alice Ryhl wrote:
> +/// Wraps the kernel's `struct poll_table`.
> +///
> +/// # Invariants
> +///
> +/// This struct contains a valid `struct poll_table`.
> +///
> +/// For a `struct poll_table` to be valid, its `_qproc` function must follow the safety
> +/// requirements of `_qproc` functions. It must ensure that when the waiter is removed and a rcu

The first sentence sounds a bit weird, what is meant by `_qproc` functions?
Do you have a link to where that is defined? Or is the whole definition the
next sentence?

-- 
Cheers,
Benno

> +/// grace period has passed, it must no longer access the `wait_queue_head`.
> +#[repr(transparent)]
> +pub struct PollTable(Opaque<bindings::poll_table>);