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

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Message-ID: <CAH5fLgjMvh65PXdxnkPAtxNH82UDAwtyXmPK+VJPFTtXfiN2JQ@mail.gmail.com>
Date: Mon, 29 Jan 2024 18:08:27 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Benno Lossin <benno.lossin@...ton.me>
Cc: 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>, 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 Wed, Jan 24, 2024 at 11:11 AM Benno Lossin <benno.lossin@...ton.me> wrote:
>
> 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?

Yeah. Does this wording work better for you?

/// For a `struct poll_table` to be valid, its `_qproc` function must
follow the safety
/// requirements of `_qproc` functions:
///
/// * The `_qproc` function is given permission to enqueue a waiter to
the provided `poll_table`
///   during the call. Once the waiter is removed and an rcu grace
period has passed, it must no
///   longer access the `wait_queue_head`.

Alice