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

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Message-ID: <8735v8d5ja.fsf@meer.lwn.net>
Date:   Thu, 29 Apr 2021 17:39:37 -0600
From:   Jonathan Corbet <corbet@....net>
To:     Aditya Srivastava <yashsri421@...il.com>
Cc:     yashsri421@...il.com, 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:

> 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?

Thanks,

jon