Re: anonymous enums in kernel doc

[Mauro Carvalho Chehab <mchehab@kernel.org>]

Em Tue, 16 Feb 2021 19:12:58 +0200
Andy Shevchenko <andy.shevchenko@gmail.com> escreveu:

> On Tue, Feb 16, 2021 at 7:05 PM Jonathan Corbet <corbet@lwn.net> wrote:
> >
> > Andy Shevchenko <andy.shevchenko@gmail.com> writes:
> >  
> > > On Tue, Feb 16, 2021 at 6:51 PM Jonathan Corbet <corbet@lwn.net> wrote:  
> > >>  
> > >> > Mauro, can you do some test cases in your workflow against anonymous
> > >> > enum in ernel doc, please?
> > >> >
> > >> > They are broken again, please fix the script!
> > >> >
> > >> > drivers/pinctrl/intel/pinctrl-intel.c:204: warning: wrong kernel-doc
> > >> > identifier on line:
> > >> > * enum - Locking variants of the pad configuration
> > >> >
> > >> > Above is simply a wrong statement.  
> > >>
> > >> The real problem, perhaps, is that there seems to be little point in
> > >> adding kerneldoc comments for anonymous enums; where are you going to
> > >> use that documentation?  
> > >
> > > I had been explicitly told during review (IIRC by maintainers) to make
> > > it such, while the initial version was exactly like you are thinking
> > > of. So, I'm not the right person to be asked :-)  
> 
> Just for a reference [1].
> 
> > >>  The error message could perhaps be changed to
> > >> say that; meanwhile, perhaps this one could be fixed with an action like
> > >> s%/**%/*% ?  
> > >
> > > See above. I think regression comes from the kernel doc script,
> > > earlier it was okay. That said, the author of kernel doc changes has
> > > to submit a patch to amend the driver and maintainers will review it.  
> >
> > kerneldoc now warns about various incorrect things that it used to just
> > silently pass over.  There is no regression here, just a new diagnostic
> > to point out something that was never going to work right.  Unless you
> > have a good idea for what kerneldoc should do with a block like that?  
> 
> As it does, put description of individual fields and prepend it with a
> common part.
> 
> So,
> 
> enum - Bla bla bla
>  @FOO: ABC
>  @BAR: DEF
> Description
> 
> Should go in the doc for the corresponding file like (as an example)
> 
> Anonymous enumeration Bla bla bla
> Description
> 
> FOO ABC
> BAR DEF
> 
> (not sure about indentation, emphasizing and separators, but I think
> you got the idea).
> 
> > (An alternative fix, of course, would be to give the enum a name so it
> > can actually be used for type checking.)  
> 
> That enum is not used as an enum, it provides the logically unified constants.

What's the problem of giving it a name?

You could call it as "intel_pinctrl_pad" or something similar.

> Personally I don't see why the kernel doc can't digest this.

It is not hard to add support for this special case. Just sent a
patch.

Yet, this adds additional complexity on an script that it is
already complex enough.

> 
> [1]: https://patchwork.ozlabs.org/project/linux-gpio/patch/20190808132128.13359-1-andriy.shevchenko@linux.intel.com/
> 

Thanks,
Mauro