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

[Omokefe Emmanuel Onanaroghene <emmaonana18@gmail.com>]

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>
---
 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
 #
-- 
2.43.0