linux-kernel - Re: [PATCH v7 3/6] rust: irq: add support for non-threaded IRQs and handlers

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Message-ID: <aIBrvCebaQSCaQqZ@tardis-2.local>
Date: Tue, 22 Jul 2025 21:57:32 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Daniel Almeida <daniel.almeida@...labora.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Krzysztof Wilczy´nski <kwilczynski@...nel.org>,
	Benno Lossin <lossin@...nel.org>, linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v7 3/6] rust: irq: add support for non-threaded IRQs and
 handlers

On Tue, Jul 22, 2025 at 09:32:40PM -0700, Boqun Feng wrote:
[...]
> > +/// A registration of an IRQ handler for a given IRQ line.
> > +///
> > +/// # Examples
> > +///
> > +/// The following is an example of using `Registration`. It uses a
> > +/// [`AtomicU32`](core::sync::AtomicU32) to provide the interior mutability.
> 
> We are going to remove all usage of core::sync::Atomic* when the LKMM
> atomics [1] land. You can probably use `Completion` here (handler does
> complete_all(), and registration uses wait_for_completion()) because
> `Completion` is irq-safe. And this brings my next comment..
> 

Missed the link:

[1]: https://lore.kernel.org/rust-for-linux/20250719030827.61357-1-boqun.feng@gmail.com/

Regards,
Boqun

[..]