linux-kernel - Re: [PATCH v4 15/16] rust: block: refactor to use `&raw [const|mut]`

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Message-ID: <Z9efT3ramQIwwRXG@Mac.home>
Date: Sun, 16 Mar 2025 21:04:31 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Antonio Hickey <contact@...e-forge.io>
Cc: Andreas Hindborg <a.hindborg@...nel.org>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	Antonio Hickey <contact@...oniohickey.com>,
	linux-block@...r.kernel.org, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 15/16] rust: block: refactor to use `&raw [const|mut]`

On Sun, Mar 16, 2025 at 02:14:24AM -0400, Antonio Hickey wrote:
> Replacing all occurrences of `addr_of!(place)` and `addr_of_mut!(place)`
> with `&raw const place` and `&raw mut place` respectively.
> 
> This will allow us to reduce macro complexity, and improve consistency
> with existing reference syntax as `&raw const`, `&raw mut` are similar
> to `&`, `&mut` making it fit more naturally with other existing code.
> 
> Suggested-by: Benno Lossin <benno.lossin@...ton.me>
> Link: https://github.com/Rust-for-Linux/linux/issues/1148
> Signed-off-by: Antonio Hickey <contact@...oniohickey.com>

Reviewed-by: Boqun Feng <boqun.feng@...il.com>

Regards,
Boqun

> ---
>  rust/kernel/block/mq/request.rs | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/rust/kernel/block/mq/request.rs b/rust/kernel/block/mq/request.rs
> index 7943f43b9575..4a5b7ec914ef 100644
> --- a/rust/kernel/block/mq/request.rs
> +++ b/rust/kernel/block/mq/request.rs
> @@ -12,7 +12,7 @@
>  };
>  use core::{
>      marker::PhantomData,
> -    ptr::{addr_of_mut, NonNull},
> +    ptr::NonNull,
>      sync::atomic::{AtomicU64, Ordering},
>  };
>  
> @@ -187,7 +187,7 @@ pub(crate) fn refcount(&self) -> &AtomicU64 {
>      pub(crate) unsafe fn refcount_ptr(this: *mut Self) -> *mut AtomicU64 {
>          // SAFETY: Because of the safety requirements of this function, the
>          // field projection is safe.
> -        unsafe { addr_of_mut!((*this).refcount) }
> +        unsafe { &raw mut (*this).refcount }
>      }
>  }
>  
> -- 
> 2.48.1
>