linux-kernel - Re: [PATCH 2/2] driver core: class: warn if a compatibility class is registered

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Message-ID: <ZtbRpMbX6g6vLUzO@shikoro>
Date: Tue, 3 Sep 2024 11:06:44 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Wolfram Sang <wsa@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] driver core: class: warn if a compatibility class is
 registered

On Tue, Sep 03, 2024 at 11:04:44AM +0200, Wolfram Sang wrote:
> 
> > > +	pr_warn("Compatibility class %s will go away soon, please migrate userspace tools to use bus devices\n",
> > > +		name);
> > 
> > That's not going to do anything except annoy users who have no control
> > over this, sorry.  Please just fix up all of the kernel and then delete
> > this function.
> 
> So, we deprecated this sysfs-class 15 years ago and hid it with a
> Kconfig symbol. However, we never pursued this further, so e.g. Debian
> has the Kconfig symbol still enabled. Can we really remove this from one
> release to the next without another transition period? I am not afraid
> of tools like lm-sensors which were converted long ago. But custom code
> might rely on sysfs-paths created by this class. It was even advertised
> in IPMI docs until last week (fixed now).

I missed that Heiner was changing the driver core, not I2C core. So, to
give more details, I am talking about I2C_COMPAT and the "i2c-adapter"
class. The main question from above still stands.


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