Date:   Mon, 9 Oct 2017 10:19:55 -0300
From:   Mauro Carvalho Chehab <mchehab@...pensource.com>
To:     Markus Heiser <markus.heiser@...marit.de>
Cc:     Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 00/17] kernel-doc: add supported to document nested
 structs/

Em Sun, 8 Oct 2017 12:07:29 +0200
Markus Heiser <markus.heiser@...marit.de> escreveu:

> > Am 07.10.2017 um 18:34 schrieb Jonathan Corbet <corbet@....net>:
> > 
> > On Wed,  4 Oct 2017 08:48:38 -0300
> > Mauro Carvalho Chehab <mchehab@...pensource.com> wrote:
> >   
> >> Right now, it is not possible to document nested struct and nested unions.
> >> kernel-doc simply ignore them.
> >> 
> >> Add support to document them.  
> > 
> > So I've finally found some time to actually look at these; sorry for being
> > so absent from the discussion.  I plead $EXCUSES...

Thanks for looking into it!

> > 
> > Some overall impressions:
> > 
> > - Seems like something we want.
> > - I love hacking all the cruft out of kernel-doc; I've been meaning to
> >  do that for a bit.
> > - It would sure be nice to restore proper man-page generation rather than
> >  documenting a hack with a perl script.  Someday.
> > 
> > I have one real complaint, though: with these patches applied, a "make
> > htmldocs" generates about 5500 (!) more warnings than it did before.  Over
> > the last couple of months, I put a bit of focused time into reducing
> > warnings, and managed to get rid of 20-30 of them.  Now I feel despondent.

Yeah, I know the feeling...

> > 
> > I really don't want to add that much noise to the docs build; I think it
> > will defeat any hope of cleaning up the warnings we already have.  I
> > wonder if we could suppress warnings about nested structs by default, and
> > add a flag or envar to turn them back on for those who want them?  
> 
> This is what I vote for: +1
> 
> > In truth, now that I look, the real problem is that the warnings are
> > repeated many times - as in, like 100 times:
> >   
> >> ./include/net/cfg80211.h:4115: warning: Function parameter or member 'wext.ibss' not described in 'wireless_dev'
> >> ./include/net/cfg80211.h:4115: warning: Function parameter or member 'wext.ibss' not described in 'wireless_dev'  
> > <107 instances deleted...>  
> >> ./include/net/cfg80211.h:4115: warning: Function parameter or member 'wext.ibss' not described in 'wireless_dev'  
> > 
> > That's not something that used to happen, and is certainly not helpful.
> > Figuring that out would help a lot.  Can I get you to take a look at
> > what's going on here?  
> 
> Hi Jon, if you grep for 
> 
>  .. kernel-doc:: include/net/cfg80211.h
> 
> e.g. by:  grep cfg80211.h Documentation/driver-api/80211/cfg80211.rst | wc -l
> you will see, that this directive is used 110 times in one reST file. If you
> have 5 warnings about the kernel-doc markup in include/net/cfg80211.h you will
> get 550 warnings about kernel-doc markup just for just one source code file.
> 
> This is because the kernel-doc parser is an external process which is called
> (in this example) 110 times for one reST file and one source code file. If 
> include/net/cfg80211.h is referred in other reST files, we got accordingly
> more and more warnings .. thats really noise. 

I guess the solution here is simple: if any output selection argument
is passed (-export, -internal, -function, -nofunction), only report
warnings for things that match the output criteria. 

Not sure how easy is to implement that. I'll take a look.

> So what I see is, that a major part of such noise is self made, it was one major
> goal when I started with the python implementation: run kernel-doc parser in the 
> Sphinx process, cache the results and use it in all reST files where it is required
> from a kernel-doc directive.
> 
> Since there is also a man page solution in the py- version I vote to merge the
> py-version into the kernel (ATM man is similar to what we had in DocBook and
> it is expandable). If you want to have a preview of the result, try this patch:
> 
>  https://return42.github.io/linuxdoc/linux.html
> 
> The only drawback of the py version I see is, that Mauro prefers perl and I do
> not want to lose him as an contributer to the kernel-doc parser. IMO he is an
> experienced C programmer with an excellent regexpr knowledge. This is, what is
> needed for this job. May be we can motivate him to give python one more try,
> this is what I hope.
> 
> The py version includes all patches we had to the perl version, but I also
> know, that you are not 100% compliant with the coding style, this could
> all be fixed in a RFC round. Excuse me if I annoying with this solution;
> IMO it contains what we need, if we really want to make a step forward.

I can probably submit regex patches, no matter if it is perl or python.

I actually submitted several patches patchwork, in the past, and I'm doing
lately some contributions to Solaar, with is written in python, in order
to fix support for my mice.

The thing is that it takes me more time to write code in Python, as I
never had the time to study the language. So, I learned what I needed
there by coding.

Thanks,
Mauro

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