linux-kernel - Re: [PATCH 13/18] wait: wait.h: Get rid of a kernel-doc/Sphinx warnings

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Date:   Thu, 10 May 2018 14:20:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...radead.org>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 13/18] wait: wait.h: Get rid of a kernel-doc/Sphinx
 warnings

On Thu, May 10, 2018 at 06:38:05AM -0300, Mauro Carvalho Chehab wrote:
> Em Thu, 10 May 2018 01:38:38 -0700
> Christoph Hellwig <hch@...radead.org> escreveu:
> 
> > >   * Use either while holding wait_queue_head::lock or when used for wakeups
> > > - * with an extra smp_mb() like:
> > > + * with an extra smp_mb() like::  
> > 
> > Independent of any philosophical discussion not allowing a setence to
> > end with a single ':' is completely idiotic.  Please fix the tooling
> > instead to allow it, as it is very important for being able to just
> > write understandable comments.

That is exactly my point; the whole rst stuff detracts from normal text.
It makes both reading and writing harder than it needs to be.

> Patches are welcome, although I don't see any easy way to solve it.
> 
> In English, the common case is that a line with ends with a colon is
> followed by a list. E. g.

(google) Dictionary says:

"a punctuation mark (:) used to precede a list of items, a quotation, or
an expansion or explanation."

An enumeration (list) is just one of many possible uses of the colon.

> However, in this specific case, it is followed by an ascii artwork. 
> The double colon is a notation that tells Sphinx to not parse the
> lines at the next block, placing the contents of it inside a literal
> block. It is used also when the next lines contain a code example,
> in order to avoid parsing things like @, () and * inside the code 
> block.
> 
> The kernel-doc tool might eventually have some parsing logic that
> would replace something to a '::' before sending it to Sphinx.

I think typically there will be an 'empty' line between the colon ending
and the 'example/explanation'. This seems true for a number of comments
I found in drm using the '::' nonsense.

Simple regexes don't do multi-line patterns, but maybe the kerneldoc
thing can parse it differently.