linux-kernel - Re: [RFC v3] scripts: kernel-doc: reduce repeated regex expressions into variables

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Message-ID: <87bl9ujy2r.fsf@meer.lwn.net>
Date:   Sat, 01 May 2021 09:03:24 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Aditya Srivastava <yashsri421@...il.com>
Cc:     lukas.bulwahn@...il.com, willy@...radead.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC v3] scripts: kernel-doc: reduce repeated regex expressions
 into variables

Aditya Srivastava <yashsri421@...il.com> writes:

> On 30/4/21 5:09 am, Jonathan Corbet wrote:
>> Aditya Srivastava <yashsri421@...il.com> writes:
>> 
>>> There are some regex expressions in the kernel-doc script, which are used
>>> repeatedly in the script.
>>>
>>> Reduce such expressions into variables, which can be used everywhere.
>>>
>>> A quick manual check found that no errors and warnings were added/removed
>>> in this process.
>>>
>>> Suggested-by: Jonathan Corbet <corbet@....net>
>>> Signed-off-by: Aditya Srivastava <yashsri421@...il.com>
>>> ---
>>> Changes in v3:
>>> - Remove variables for separate qualifiers in "sub dump_struct"
>>> - Make a common variable for all the qualifiers
>>> - Make $attribute global variable to use it at "sub check_sections" as well
>>>
>>> Changes in v2:
>>> - Rename $pointer_function to $function_pointer
>>> - Combine elsif-block expressions at "sub dump_function" into lesser regex expressions
>>> - Combine $prototype_end1,$prototype_end2 expressions into a common $prototype_end
>>>
>>>  scripts/kernel-doc | 71 ++++++++++++++++++++++------------------------
>>>  1 file changed, 34 insertions(+), 37 deletions(-)
>> 
>> So this looks good but ... it adds a warning to the build:
>> 
>> /stuff/k/git/kernel/Documentation/driver-api/media/v4l2-controls:823: ./include/media/v4l2-ctrls.h:964: WARNING: Invalid C declaration: Expected identifier in nested name. [error at 6]
>>   const * v4l2_ctrl_get_menu (u32 id)
>>   ------^
>> 
>> So it looks like something isn't being parsed quite identically?
>>
>
> Hi Jonathan!
> I could not reproduce this error..
> Can you suggest me how can I reproduce this error?
> I ran kernel-doc -none {$file} over the tree.
>
> Probably, this is not a kernel-doc error

It's a Sphinx error; run "make htmldocs" to see it.  That said, the
error itself should be enough to point at where the problem is.

Thanks,

jon