linux-kernel - Re: [RFC v2] scripts: kernel-doc: fix typedef support for struct/union parsing

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Date:   Thu, 25 Feb 2021 12:48:00 +0100
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Aditya Srivastava <yashsri421@...il.com>
Cc:     Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [RFC v2] scripts: kernel-doc: fix typedef support for
 struct/union parsing

On Wed, Feb 24, 2021 at 2:30 PM Aditya Srivastava <yashsri421@...il.com> wrote:
>
> Currently, there are 447 files in the kernel tree, which use 'typedef
> struct/union' syntax for defining some struct/union. In total, there
> are ~1290 such occurrences in the kernel tree.
>
> However, kernel-doc does not support it currently, and running
> scripts/kernel-doc -none on emits:
> "error: Cannot parse struct or union!"
>

I will help rephrasing it more precisely:

Currently, there are ~1290 occurrences in 447 files in the kernel tree
'typedef struct/union' syntax for defining some struct/union. However,
kernel-doc currently does not support that syntax. Of the ~1290
occurrences, there are four occurrences in ./include/linux/zstd.h with
typedef struct/union syntax and a preceding kernel-doc; all other
occurrences have no preceding kernel-doc.

Add support for parsing struct/union following this syntax.

I also tested it; here is my quick diff of "git ls-files | xargs
./scripts/kernel-doc -none 2>&1" before and after patch application:

< include/linux/zstd.h:154: error: Cannot parse struct or union!
< include/linux/zstd.h:171: error: Cannot parse struct or union!
< include/linux/zstd.h:181: error: Cannot parse struct or union!
18857d18853
< include/linux/zstd.h:936: error: Cannot parse struct or union!

So, again:

Tested-by: Lukas Bulwahn <lukas.bulwahn@...il.com>

Aditya, can you please pick up my rephrasing and send out a v3.

Lukas