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genksyms: fix syntax error for attribute after 'union'

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A longstanding issue with genksyms is that it has hidden syntax errors.

When a syntax error occurs, yyerror() is called. However,
error_with_pos() is a no-op unless the -w option is provided.

You can observe syntax errors by manually passing the -w option.

For example, with CONFIG_MODVERSIONS=y on v6.13-rc1:

    $ make -s KCFLAGS=-D__GENKSYMS__ fs/lockd/svc.i
    $ cat fs/lockd/svc.i | scripts/genksyms/genksyms -w
        [ snip ]
    ./include/net/addrconf.h:35: syntax error

The syntax error occurs in the following code in include/net/addrconf.h:

    union __packed {
            [ snip ]
    };

The issue arises from __packed, which is defined as
__attribute__((__packed__)), immediately after the 'union' keyword.

This commit allows the 'union' keyword to be followed by attributes.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Nicolas Schier <n.schier@avm.de>
This commit is contained in:
Masahiro Yamada 2025-01-14 00:00:53 +09:00
parent 82db1c2910
commit 6494bd2d05
1 changed files with 5 additions and 5 deletions
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10
scripts/genksyms/parse.y
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@ -236,16 +236,16 @@ type_specifier:
so that it is easier to expand the definition fully later. */
| STRUCT_KEYW attribute_opt IDENT
{ remove_node($1); (*$3)->tag = SYM_STRUCT; $$ = $3; }
| UNION_KEYW IDENT
{ remove_node($1); (*$2)->tag = SYM_UNION; $$ = $2; }
| UNION_KEYW attribute_opt IDENT
{ remove_node($1); (*$3)->tag = SYM_UNION; $$ = $3; }
| ENUM_KEYW IDENT
{ remove_node($1); (*$2)->tag = SYM_ENUM; $$ = $2; }
/* Full definitions of an s/u/e. Record it. */
| STRUCT_KEYW attribute_opt IDENT class_body
{ record_compound($1, $3, $4, SYM_STRUCT); $$ = $4; }
| UNION_KEYW IDENT class_body
{ record_compound($1, $2, $3, SYM_UNION); $$ = $3; }
| UNION_KEYW attribute_opt IDENT class_body
{ record_compound($1, $3, $4, SYM_UNION); $$ = $4; }
| ENUM_KEYW IDENT enum_body
{ record_compound($1, $2, $3, SYM_ENUM); $$ = $3; }
/*
@ -255,7 +255,7 @@ type_specifier:
{ add_symbol(NULL, SYM_ENUM, NULL, 0); $$ = $2; }
/* Anonymous s/u definitions. Nothing needs doing. */
| STRUCT_KEYW attribute_opt class_body { $$ = $3; }
| UNION_KEYW class_body { $$ = $2; }
| UNION_KEYW attribute_opt class_body { $$ = $3; }
;
simple_type_specifier: