linux-kernel - Re: [PATCH v6 1/3] rust: Introduce irq module

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Message-ID: <CALNs47u56oVYxwNq+POgOu0m141gwG-mEoRBH8hzevj6Ve-Vag@mail.gmail.com>
Date: Sun, 29 Sep 2024 16:36:29 -0400
From: Trevor Gross <tmgross@...ch.edu>
To: Lyude Paul <lyude@...hat.com>
Cc: rust-for-linux@...r.kernel.org, Danilo Krummrich <dakr@...hat.com>, airlied@...hat.com, 
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, 
	Benno Lossin <benno.lossin@...ton.me>, Daniel Almeida <daniel.almeida@...labora.com>, 
	Gary Guo <gary@...yguo.net>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl <aliceryhl@...gle.com>, 
	FUJITA Tomonori <fujita.tomonori@...il.com>, Valentin Obst <kernel@...entinobst.de>
Subject: Re: [PATCH v6 1/3] rust: Introduce irq module

On Mon, Sep 16, 2024 at 5:31 PM Lyude Paul <lyude@...hat.com> wrote:
>
> This introduces a module for dealing with interrupt-disabled contexts,
> including the ability to enable and disable interrupts
> (with_irqs_disabled()) - along with the ability to annotate functions as
> expecting that IRQs are already disabled on the local CPU.
>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
> Reviewed-by: Daniel Almeida <daniel.almeida@...labora.com>
> Reviewed-by: Gary Guo <gary@...yguo.net>

> +impl IrqDisabled<'_> {
> +    /// Create a new [`IrqDisabled`] token in an interrupt disabled context.
> +    ///
> +    /// This creates an [`IrqDisabled`] token, which can be passed to functions that must be run
> +    /// without interrupts. If debug assertions are enabled, this function will assert that
> +    /// interrupts are disabled upon creation. Otherwise, it has no size or cost at runtime.
> +    ///
> +    /// # Panics
> +    ///
> +    /// If debug assertions are enabled, this function will panic if interrupts are not disabled
> +    /// upon creation.
> +    ///
> +    /// # Safety
> +    ///
> +    /// This function must only be called in contexts where it is already known that interrupts have
> +    /// been disabled for the current CPU, and the user is making a promise that they will remain
> +    /// disabled at least until this [`IrqDisabled`] is dropped.
> +    pub unsafe fn new() -> Self {

It could be worth mentioning that you probably won't be calling this
function directly if you need an IrqDisabled, linking to
with_irqs_disabled instead.

Either way this looks great!

Reviewed-by: Trevor Gross <tmgross@...ch.edu>