Re: [PATCH] docs: kdoc: fix struct_group_tagged() parsing regression

[Randy Dunlap <rdunlap@infradead.org>]

On 9/14/26 8:51 AM, Omokefe Emmanuel Onanaroghene wrote:
> kernel-doc reports struct_group_tagged() members as excess because
> the macro transformation rewrites it to an anonymous struct and drops their
> member names.
> 
> Keep the tag and member name when transforming struct_group_tagged(). The
> nested members are then recorded as names such as fast.order; accept the
> existing unqualified @order documentation tag during validation.
> 
> Add a regression test based on struct page_pool_params.
> 
> Reported-by: Randy Dunlap <rdunlap@infradead.org>
> Link: https://lore.kernel.org/all/0cf8ea5f-418f-45f0-907c-3d1ed4f03e9f@infradead.org/
> Fixes: 2f07ddbd5793 ("docs: xforms_lists: better evaluate struct_group macros")
> Signed-off-by: Omokefe Emmanuel Onanaroghene <emmaonana18@gmail.com>

Tested-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>

Thanks.

> ---
>  tools/lib/python/kdoc/kdoc_parser.py  |  4 ++-
>  tools/lib/python/kdoc/xforms_lists.py |  2 +-
>  tools/unittests/test_kdoc_parser.py   | 37 +++++++++++++++++++++++++++
>  3 files changed, 41 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/lib/python/kdoc/kdoc_parser.py b/tools/lib/python/kdoc/kdoc_parser.py
> index d9ad1ddc87dd..ced09504f3d7 100644
> --- a/tools/lib/python/kdoc/kdoc_parser.py
> +++ b/tools/lib/python/kdoc/kdoc_parser.py
> @@ -635,7 +635,9 @@ class KernelDoc:
>                  continue
>              if param_name.startswith("{unnamed_"):
>                  continue
> -            if param_name in self.entry.parameterlist:
> +            if param_name in self.entry.parameterlist or \
> +               any(actual.endswith('.' + param_name)
> +                   for actual in self.entry.parameterlist):
>                  continue
>  
>              hint = self.get_suggestions_hint(param_name, self.entry.parameterlist)
> diff --git a/tools/lib/python/kdoc/xforms_lists.py b/tools/lib/python/kdoc/xforms_lists.py
> index e3dda2fe8a53..9e8b3a6b1da1 100644
> --- a/tools/lib/python/kdoc/xforms_lists.py
> +++ b/tools/lib/python/kdoc/xforms_lists.py
> @@ -60,7 +60,7 @@ class CTransforms:
>          #
>          (CMatch("struct_group"), r"struct { \2+ };"),
>          (CMatch("struct_group_attr"), r"struct { \3+ };"),
> -        (CMatch("struct_group_tagged"), r"struct { \3+ };"),
> +        (CMatch("struct_group_tagged"), r"struct \1 { \3+ } \2;"),
>          (CMatch("__struct_group"), r"struct { \4+ };"),
>      ]
>  
> diff --git a/tools/unittests/test_kdoc_parser.py b/tools/unittests/test_kdoc_parser.py
> index c4a76ed13dbc..1a8287e99f2e 100755
> --- a/tools/unittests/test_kdoc_parser.py
> +++ b/tools/unittests/test_kdoc_parser.py
> @@ -418,6 +418,43 @@ class TestSelfValidate(GenerateKdocItem):
>          """
>          self.run_test(self.SOURCE, [self.DEFAULT.copy()], self.EXPORTS)
>  
> +
> +class TestStructGroupTagged(GenerateKdocItem):
> +    def test_nested_struct_group_tagged_members(self):
> +        source = """
> +            /**
> +             * struct page_pool_params - page pool parameters
> +             * @fast: Fast path parameters.
> +             * @order: Order of pages.
> +             * @pool_size: Number of pages.
> +             * @slow: Slow path parameters.
> +             * @netdev: Net device pointer.
> +             * @queue_idx: Queue index.
> +             * @flags: Flags.
> +             */
> +            struct page_pool_params {
> +                struct_group_tagged(page_pool_params_fast, fast,
> +                                    unsigned int order;
> +                                    unsigned int pool_size;
> +                );
> +                struct_group_tagged(page_pool_params_slow, slow,
> +                                    struct net_device *netdev;
> +                                    unsigned int queue_idx;
> +                                    unsigned int flags;
> +                );
> +            };
> +        """
> +
> +        kernel_doc = KernelDoc(self.config, "test.c", self.xforms)
> +        patcher = patch('builtins.open', new_callable=mock_open,
> +                        read_data=dedent(source))
> +        with patcher:
> +            _, entries = kernel_doc.parse_kdoc()
> +
> +        self.assertEqual(len(entries), 1)
> +        self.assertEqual(entries[0].warnings, [])
> +
> +
>  #
>  # Class and logic to create dynamic tests from YAML
>  #

-- 
~Randy