linux-kernel - Re: [PATCH 2/4] firmware: coreboot: Generate aliases for coreboot modules

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Date: Mon, 22 Jan 2024 15:24:36 -0300
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: Tzung-Bi Shih <tzungbi@...nel.org>, kernel@...labora.com,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Abhijit Gangurde <abhijit.gangurde@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>,
	Nipun Gupta <nipun.gupta@....com>,
	Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>,
	Umang Jain <umang.jain@...asonboard.com>,
	linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] firmware: coreboot: Generate aliases for coreboot
 modules

On Sun, Jan 21, 2024 at 02:41:29PM +0200, Andy Shevchenko wrote:
> On Wed, Jan 17, 2024 at 09:53:23AM -0300, Nícolas F. R. A. Prado wrote:
> > On Sun, Jan 14, 2024 at 07:08:13PM +0200, Andy Shevchenko wrote:
> > > On Thu, Jan 11, 2024 at 12:11:47PM -0300, Nícolas F. R. A. Prado wrote:
> > > > Generate aliases for coreboot modules to allow automatic module probing.
> 
> ...
> 
> > > > +/**
> > > > + * struct coreboot_device_id - Identifies a coreboot table entry
> > > > + * @tag: tag ID
> > > > + */
> > > > +struct coreboot_device_id {
> > > > +	__u32 tag;
> > > > +};
> > > 
> > > Don't you want to have a driver data or so associated with this?
> > 
> > There's no need for it currently in any driver. This struct is being created
> > simply to allow auto modprobe. So it seems reasonable to leave it out and add it
> > later when/if needed.
> 
> The problem is that you introduce a kinda ABI here, how do you handle this later?

Sorry, but I don't follow. What ABI is there to guarantee stability for here?
This header is not exported to userspace (not under uapi/). Only kernel code
will make use of this struct and it can be updated whenever this struct is
changed without anything breaking.

Thanks,
Nícolas