linux-kernel - Re: [PATCH 5/7] docs: kdoc: tighten up the array-of-pointers case

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Message-ID: <20250813005334.31db20b0@foz.lan>
Date: Wed, 13 Aug 2025 00:53:34 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Jonathan Corbet <corbet@....net>
Cc: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Akira Yokosawa
 <akiyks@...il.com>
Subject: Re: [PATCH 5/7] docs: kdoc: tighten up the array-of-pointers case

On Tue, 12 Aug 2025 13:57:46 -0600
Jonathan Corbet <corbet@....net> wrote:

> Simplify one gnarly regex and remove another altogether; add a comment
> describing what is going on.
> 
> Signed-off-by: Jonathan Corbet <corbet@....net>
> ---
>  scripts/lib/kdoc/kdoc_parser.py | 18 +++++++-----------
>  1 file changed, 7 insertions(+), 11 deletions(-)
> 
> diff --git a/scripts/lib/kdoc/kdoc_parser.py b/scripts/lib/kdoc/kdoc_parser.py
> index 36c4035343dc..d7fb79a64487 100644
> --- a/scripts/lib/kdoc/kdoc_parser.py
> +++ b/scripts/lib/kdoc/kdoc_parser.py
> @@ -527,23 +527,19 @@ class KernelDoc:
>                  dtype = KernRe(r'([^\(]+\(\*?)\s*' + re.escape(param)).sub(r'\1', arg)
>                  self.push_parameter(ln, decl_type, param, dtype,
>                                      arg, declaration_name)
> -
> +            #
> +            # The array-of-pointers case.  Dig the parameter name out from the middle
> +            # of the declaration.
> +            #
>              elif KernRe(r'\(.+\)\s*\[').search(arg):
> -                # Array-of-pointers
> -
> -                arg = arg.replace('#', ',')

Hmm... if I'm not mistaken, there is(was?) a previous code that replaced
commas by "#". Such statement is needed to catch some corner case.

This like here is(was?) needed to restore the original arg string.

> -                r = KernRe(r'[^\(]+\(\s*\*\s*([\w\[\].]*?)\s*(\s*\[\s*[\w]+\s*\]\s*)*\)')
> +                r = KernRe(r'[^\(]+\(\s*\*\s*' r'([\w.]*?)' r'\s*(\[\s*\w+\s*\]\s*)*\)')

As mentioned on patch 6/7, IMHO doing concats like that at the same line
IMO makes it harder to understand. This works best:

                r = KernRe(r'[^\(]+\(\s*\*\s*'
			   r'([\w.]*?)'
			   r'\s*(\[\s*\w+\s*\]\s*)*\)')


>                  if r.match(arg):
>                      param = r.group(1)
>                  else:
>                      self.emit_msg(ln, f"Invalid param: {arg}")
>                      param = arg
> -
> -                dtype = KernRe(r'([^\(]+\(\*?)\s*' + re.escape(param)).sub(r'\1', arg)
> -
> -                self.push_parameter(ln, decl_type, param, dtype,
> -                                    arg, declaration_name)
> -
> +                dtype = arg.replace(param, '')
> +                self.push_parameter(ln, decl_type, param, dtype, arg, declaration_name)
>              elif arg:
>                  #
>                  # Clean up extraneous spaces and split the string at commas; the first



Thanks,
Mauro