Re: [PATCH] kernel-doc: fix struct_group_tagged() parsing

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On 4/11/24 13:14, Alexander Lobakin wrote:
From: Przemek Kitszel <przemyslaw.kitszel@xxxxxxxxx>
Date: Thu, 11 Apr 2024 13:14:20 +0200

On 4/11/24 11:32, Alexander Lobakin wrote:
From: Kees Cook <keescook@xxxxxxxxxxxx>

kernel-doc emits a warning on struct_group_tagged() if you describe your
struct group member:

include/net/libeth/rx.h:69: warning: Excess struct member 'fp'
description in 'libeth_fq'

The code:

/**
   * struct libeth_fq - structure representing a buffer queue
   * @fp: hotpath part of the structure
   * @pp: &page_pool for buffer management
[...]
   */
struct libeth_fq {
     struct_group_tagged(libeth_fq_fp, fp,
         struct page_pool    *pp;
[...]
     );

When a struct_group_tagged() is encountered, we need to build a
`struct TAG NAME;` from it, so that it will be treated as a valid
embedded struct.
Decouple the regex and do the replacement there. As far as I can see,
this doesn't produce any new warnings on the current mainline tree.

Reported-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Closes: https://lore.kernel.org/netdev/20240405212513.0d189968@xxxxxxxxxx
Fixes: 50d7bd38c3aa ("stddef: Introduce struct_group() helper macro")
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Co-developed-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@xxxxxxxxx>
---
   scripts/kernel-doc | 3 ++-
   1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 43a30f2de513..01ac8f794b30 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1152,7 +1152,8 @@ sub dump_struct($$) {
           # - first eat non-declaration parameters and rewrite for
final match
           # - then remove macro, outer parens, and trailing semicolon
           $members =~ s/\bstruct_group\s*\(([^,]*,)/STRUCT_GROUP(/gos;
-        $members =~
s/\bstruct_group_(attr|tagged)\s*\(([^,]*,){2}/STRUCT_GROUP(/gos;
+        $members =~
s/\bstruct_group_attr\s*\(([^,]*,){2}/STRUCT_GROUP(/gos;
+        $members =~
s/\bstruct_group_tagged\s*\(([^,]*),([^,]*),/struct $1 $2;
STRUCT_GROUP(/gos;
           $members =~
s/\b__struct_group\s*\(([^,]*,){3}/STRUCT_GROUP(/gos;
           $members =~
s/\bSTRUCT_GROUP(\(((?:(?>[^)(]+)|(?1))*)\))[^;]*;/$2/gos;

I would complain on code that matches `[^,]*` part with 0 characters,
meaning no tag for struct_group_tagged(), or no attrs for
struct_group_attrs(). In such cases simpler struct_group() call should
be suggested. However, that issue was presented prior to your patch.

Rather a subject for checkpatch, not kernel-doc?

Good point.

But that reminds me that getting patches accepted into checkpatch is not
possible for mere mortals :/ (exaggerating here, but just a little)



This is clearly an improvement, so:
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@xxxxxxxxx>

Thanks!
Olek





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