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

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Message-Id: <1CC4638E-C682-4F68-A616-553169BB677C@collabora.com>
Date: Mon, 21 Jul 2025 12:10:10 -0300
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>,
 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@...nel.org>,
 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 Wilczyński <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

Hi Alice, thanks for looking into this again :)

[…]

>> diff --git a/rust/kernel/irq/request.rs b/rust/kernel/irq/request.rs
>> new file mode 100644
>> index 0000000000000000000000000000000000000000..2f4637d8bc4c9fda23cbc8307687035957b0042a
>> --- /dev/null
>> +++ b/rust/kernel/irq/request.rs
>> @@ -0,0 +1,267 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// SPDX-FileCopyrightText: Copyright 2025 Collabora ltd.
>> +
>> +//! This module provides types like [`Registration`] which allow users to
>> +//! register handlers for a given IRQ line.
>> +
>> +use core::marker::PhantomPinned;
>> +
>> +use crate::alloc::Allocator;
>> +use crate::device::Bound;
>> +use crate::device::Device;
> 
> The usual style is to write this as:
> 
> use crate::device::{Bound, Device};

I dislike this syntax because I think it is a conflict magnet. Moreover, when
you get conflicts, they are harder to solve than they are when each import
is in its own line, at least IMHO.  

In any case, I don't think we have a guideline for imports at the moment?

[…]

>> +/// 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.
>> +///
>> +/// ```
>> +/// use core::sync::atomic::AtomicU32;
>> +/// use core::sync::atomic::Ordering;
>> +///
>> +/// use kernel::prelude::*;
>> +/// use kernel::device::Bound;
>> +/// use kernel::irq::flags;
>> +/// use kernel::irq::Registration;
>> +/// use kernel::irq::IrqRequest;
>> +/// use kernel::irq::IrqReturn;
> 
> /// use kernel::irq::{Flags, IrqRequest, IrqReturn, Registration};

Same here. I’d rather not do this, if it’s ok with others.

— Daniel