linux-kernel - Re: [PATCH v5 0/4] rust: miscdevice: Provide sample driver using the new MiscDevice bindings

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Message-ID: <20241206131445.GE7684@google.com>
Date: Fri, 6 Dec 2024 13:14:45 +0000
From: Lee Jones <lee@...nel.org>
To: Danilo Krummrich <dakr@...nel.org>
Cc: linux-kernel@...r.kernel.org, arnd@...db.de, gregkh@...uxfoundation.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,
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v5 0/4] rust: miscdevice: Provide sample driver using the
 new MiscDevice bindings

On Fri, 06 Dec 2024, Danilo Krummrich wrote:

> On Fri, Dec 06, 2024 at 12:54:30PM +0000, Lee Jones wrote:
> > On Fri, 06 Dec 2024, Danilo Krummrich wrote:
> > 
> > > On Fri, Dec 06, 2024 at 12:42:11PM +0000, Lee Jones wrote:
> > > > It has been suggested that the driver should use dev_info() instead of
> > > > pr_info() however there is currently no scaffolding to successfully pull
> > > > a 'struct device' out from driver data post register().  This is being
> > > > worked on and we will convert this over in due course.
> > > 
> > > I think you're going too fast with this series.
> > > 
> > > Please address the comments you receive before sending out new versions.
> > > 
> > > Also, please document the changes you have made from one version to the next,
> > > otherwise it's gonna be very hard to review this.
> > 
> > I can add a change log.
> > 
> > What comments were missed?
> 
> I think MiscDevice should ideally use the generic `Registration` type from [1].

How can an in-tree driver use out-of-tree functionality?

> I see that you use `InPlaceModule` now, which is fine. But since this is just a
> sample, we could probably afford to wait until the generic type lands.
> 
> Also, there was a comment about how we can make use of the `dev_*` macros.
> 
> I really think we should fix those before we land a sample driver. It's gonna
> be hard to explain people later on that they shouldn't do what the example
> does...

We're authoring the sample based on what is available at the moment.

There will always be something better / more convenient coming down the
pipe.  We don't usually put off contributors pending acceptance of
out-of-tree functionality, sample or otherwise.

As I've already mentioned, I'd be _more than_ happy to keep improving
this over time as new and improved helpers / infra. arrives.

> [1] https://lore.kernel.org/rust-for-linux/20241205141533.111830-3-dakr@kernel.org/

-- 
Lee Jones [李琼斯]