linux-kernel - Re: [PATCH 12/14] doc-rst: add ABI documentation to the admin-guide book

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Message-ID: <87y320tj69.fsf@intel.com>
Date:   Mon, 17 Jun 2019 16:50:38 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Mauro Carvalho Chehab <mchehab@...radead.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 12/14] doc-rst: add ABI documentation to the admin-guide book

On Mon, 17 Jun 2019, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> On Mon, Jun 17, 2019 at 03:36:17PM +0300, Jani Nikula wrote:
>> On Fri, 14 Jun 2019, Mauro Carvalho Chehab <mchehab+samsung@...nel.org> wrote:
>> > Em Fri, 14 Jun 2019 16:06:03 +0200
>> > Greg Kroah-Hartman <gregkh@...uxfoundation.org> escreveu:
>> >
>> >> On Fri, Jun 14, 2019 at 04:42:20PM +0300, Jani Nikula wrote:
>> >> > 2) Have the python extension read the ABI files directly, without an
>> >> >    extra pipeline.  
>> >> 
>> >> He who writes the script, get's to dictate the language of the script :)
>> 
>> The point is, it's an extension to a python based tool, written in perl,
>> using pipes for communication, and losing any advantages of integrating
>> with the tool it's extending.
>> 
>> I doubt you'd want to see system() to be used to subsequently extend the
>> perl tool.
>> 
>> I think it's just sad to see the documentation system slowly drift
>> further away from the ideals we had, and towards the old ways we worked
>> so hard to fix.
>
> What are those ideals?

For example, have a single coherent system, instead of a fragile pipe
with each stage written in a different language, each having its own
idiosynchracies, each step losing something in translation.

Have a system that a normal developer can actually look at and
understand. It didn't use to be that way.

> I thought the goal was to be able to write documentation in a as much
> as a normal text file as possible and have automation turn those files
> into "pretty" documentation that we can all use.
>
> And I think that fits with the way this patch set goes, right?  We are
> not on a quest for purity of scripts to generate the documentation at
> the expense of having to force hundreds, or thousands, of developers to
> change their ways, or to force a "flag day" conversion of existing
> documentation resulting in a huge merge mess.

Fair enough, let's dismiss the thought of changing the ABI files. But I
never meant that would somehow be for the "purity of scripts", or that
those two would somehow be at odds here.

> So, we are stuck with the current structure that I totally made up for
> Documentation/ABI/.  Turns out it is almost parsable, as Mauro's tool
> shows.  His tool also validates the existing text, which is great, and
> has caused fixes for it.
>
> If someone wants to write that tool in some other language, like python,
> wonderful, I have no objection, but as it is, this is a useful tool
> already, allowing us to validate, and search, existing documentation
> entries that we have never been able to do before.  It also provides an
> output that can be turned into pretty html/pdf/whatever files by other
> tools in the pipeline, a totally bonus benefit.
>
> So what is going backwards here?
>
> Maybe the processing pipeline isn't as nice as you would like, but
> remember to view this from a normal developer's point of view, not a
> documentation pipeline developer's point of view please.
>
> So, in short, my requirements are:
> 	- keep Documentation/ABI/ file formats as close as possible to
> 	  what we have today, preventing any flag-day issues or merge
> 	  problems
> 	- be able to query and validate Documentation/ABI/
> 	- be able to turn Documentation/ABI into pretty documentation.
>
> If you object to the mechanics of the last requirement here, I don't
> object either, provide something else that works better.  But don't
> throw away the whole thing just because you don't like how things are
> hooked up here.
>
> I'm going to go apply most of the rest of these patches to my
> driver-core tree, stopping at the "hook it up to the kernel
> documentation" point.  Is that ok?

I'll leave it all up to Jon's discretion; I trust he'll understand my
concerns. I have no authority beyond the opinion I've voiced here
anyway.


BR,
Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center