linux-kernel - Re: [PATCH v2 2/2] rust: workqueue: remove HasWork::OFFSET

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Message-ID: <Z_eMe7y0ixrBrHaz@google.com>
Date: Thu, 10 Apr 2025 09:16:43 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: Tamir Duberstein <tamird@...il.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>, Benno Lossin <benno.lossin@...ton.me>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Rafael J. Wysocki" <rafael@...nel.org>, Danilo Krummrich <dakr@...nel.org>, Tejun Heo <tj@...nel.org>, 
	Lai Jiangshan <jiangshanlai@...il.com>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v2 2/2] rust: workqueue: remove HasWork::OFFSET

On Wed, Apr 09, 2025 at 06:03:22AM -0400, Tamir Duberstein wrote:
> Implement `HasWork::work_container_of` in `impl_has_work!`, narrowing
> the interface of `HasWork` and replacing pointer arithmetic with
> `container_of!`. Remove the provided implementation of
> `HasWork::get_work_offset` without replacement; an implementation is
> already generated in `impl_has_work!`. Remove the `Self: Sized` bound on
> `HasWork::work_container_of` which was apparently necessary to access
> `OFFSET` as `OFFSET` no longer exists.
> 
> A similar API change was discussed on the hrtimer series[1].
> 
> Link: https://lore.kernel.org/all/20250224-hrtimer-v3-v6-12-rc2-v9-1-5bd3bf0ce6cc@kernel.org/ [1]
> Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
> Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
> Tested-by: Alice Ryhl <aliceryhl@...gle.com>
> Signed-off-by: Tamir Duberstein <tamird@...il.com>
> ---
>  rust/kernel/workqueue.rs | 45 ++++++++++++---------------------------------
>  1 file changed, 12 insertions(+), 33 deletions(-)
> 
> diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
> index f98bd02b838f..1d640dbdc6ad 100644
> --- a/rust/kernel/workqueue.rs
> +++ b/rust/kernel/workqueue.rs
> @@ -429,51 +429,23 @@ pub unsafe fn raw_get(ptr: *const Self) -> *mut bindings::work_struct {
>  ///
>  /// # Safety
>  ///
> -/// The [`OFFSET`] constant must be the offset of a field in `Self` of type [`Work<T, ID>`]. The
> -/// methods on this trait must have exactly the behavior that the definitions given below have.
> +/// The methods on this trait must have exactly the behavior that the definitions given below have.

This wording probably needs to be rephrased. You got rid of the
definitions that sentence refers to.

Alice