linux-kernel - Re: [PATCH 1/8] rust: device: introduce device::Internal

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Message-ID: <2025070110-renounce-blinks-b28f@gregkh>
Date: Tue, 1 Jul 2025 11:26:47 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Danilo Krummrich <dakr@...nel.org>
Cc: rafael@...nel.org, ojeda@...nel.org, alex.gaynor@...il.com,
	boqun.feng@...il.com, gary@...yguo.net, bjorn3_gh@...tonmail.com,
	benno.lossin@...ton.me, a.hindborg@...nel.org, aliceryhl@...gle.com,
	tmgross@...ch.edu, david.m.ertman@...el.com, ira.weiny@...el.com,
	leon@...nel.org, kwilczynski@...nel.org, bhelgaas@...gle.com,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/8] rust: device: introduce device::Internal

On Sat, Jun 21, 2025 at 09:43:27PM +0200, Danilo Krummrich wrote:
> Introduce an internal device context, which is semantically equivalent
> to the Core device context, but reserved for bus abstractions.
> 
> This allows implementing methods for the Device type, which are limited
> to be used within the core context of bus abstractions, i.e. restrict
> the availability for drivers.
> 
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>
> ---
>  rust/kernel/device.rs | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/rust/kernel/device.rs b/rust/kernel/device.rs
> index 665f5ceadecc..e9094d8322d5 100644
> --- a/rust/kernel/device.rs
> +++ b/rust/kernel/device.rs
> @@ -261,6 +261,10 @@ pub trait DeviceContext: private::Sealed {}
>  /// any of the bus callbacks, such as `probe()`.
>  pub struct Core;
>  
> +/// Semantically the same as [`Core`] but reserved for internal usage of the corresponding bus
> +/// abstraction.
> +pub struct Internal;

Naming is hard :)

As this is ONLY for the bus code to touch, why not call it Bus_Internal?

And can a driver touch this, or only the bus owner?

thanks,

greg k-h