linux-kernel - Re: [PATCH 05/10] rust: kernel: Update ARef and AlwaysRefCounted imports to use sync::aref

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Message-ID: <7bd3232c-90cc-4e71-8aed-2ac911cb20f9@gmail.com>
Date: Sun, 23 Nov 2025 13:16:24 +0000
From: Igor Korotin <igor.korotin.linux@...il.com>
To: Shankari Anand <shankari.ak0208@...il.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Arve Hjønnevåg <arve@...roid.com>,
 Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>,
 Joel Fernandes <joelagnelf@...dia.com>,
 Christian Brauner <brauner@...nel.org>, Carlos Llamas <cmllamas@...gle.com>,
 Suren Baghdasaryan <surenb@...gle.com>, Danilo Krummrich <dakr@...nel.org>,
 Alice Ryhl <aliceryhl@...gle.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Alexandre Courbot <acourbot@...dia.com>,
 "Rafael J . Wysocki" <rafael@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 Michal Wilczynski <m.wilczynski@...sung.com>
Cc: Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>,
 Trevor Gross <tmgross@...ch.edu>,
 Daniel Almeida <daniel.almeida@...labora.com>,
 Abdiel Janulgue <abdiel.janulgue@...il.com>,
 Robin Murphy <robin.murphy@....com>, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
 rust-for-linux@...r.kernel.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH 05/10] rust: kernel: Update ARef and AlwaysRefCounted
 imports to use sync::aref

Hello Shankari

On 11/23/2025 9:24 AM, Shankari Anand wrote:
> Update call sites in `i2c.rs` to import `ARef` and
> `AlwaysRefCounted` from `sync::aref` instead of `types`.
> 
> This aligns with the ongoing effort to move `ARef` and
> `AlwaysRefCounted` to sync.
> 
> Suggested-by: Benno Lossin <lossin@...nel.org>
> Link: https://github.com/Rust-for-Linux/linux/issues/1173
> Signed-off-by: Shankari Anand <shankari.ak0208@...il.com>
> ---
>   rust/kernel/i2c.rs | 10 ++++------
>   1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/rust/kernel/i2c.rs b/rust/kernel/i2c.rs
> index 1aee46f59460..c50ca464d87c 100644
> --- a/rust/kernel/i2c.rs
> +++ b/rust/kernel/i2c.rs
> @@ -17,10 +17,8 @@
>       of,
>       prelude::*,
>       str::CStrExt as _,
> -    types::{
> -        AlwaysRefCounted,
> -        Opaque, //
> -    }, //
> +    sync::aref::AlwaysRefCounted,
> +    types::Opaque, //
>   };
>   
>   use core::{
> @@ -32,7 +30,7 @@
>       }, //
>   };
>   
> -use kernel::types::ARef;
> +use kernel::sync::aref::ARef;
>   
>   /// An I2C device id table.
>   #[repr(transparent)]
> @@ -408,7 +406,7 @@ pub fn get(index: i32) -> Result<ARef<Self>> {
>   kernel::impl_device_context_into_aref!(I2cAdapter);
>   
>   // SAFETY: Instances of `I2cAdapter` are always reference-counted.
> -unsafe impl crate::types::AlwaysRefCounted for I2cAdapter {
> +unsafe impl crate::sync::aref::AlwaysRefCounted for I2cAdapter {

NIT: This module already imports `AlwaysRefCounted`, so please use the
imported name instead of the full path for consistency.

>       fn inc_ref(&self) {
>           // SAFETY: The existence of a shared reference guarantees that the refcount is non-zero.
>           unsafe { bindings::i2c_get_adapter(self.index()) };

Thanks
Igor