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genksyms: fix syntax error for attribute after abstact_declarator

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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__ kernel/module/main.i
    $ cat kernel/module/main.i | scripts/genksyms/genksyms -w
        [ snip ]
    kernel/module/main.c:97: syntax error

The syntax error occurs in the following code in kernel/module/main.c:

    static void __mod_update_bounds(enum mod_mem_type type __maybe_unused, void *base,
                                    unsigned int size, struct mod_tree_root *tree)
    {
            [ snip ]
    }

The issue arises from __maybe_unused, which is defined as
__attribute__((__unused__)).

This commit allows direct_abstract_declarator to be followed with
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 00:00:51 +09:00
parent a8b7d066f8
commit 2ac068cb0b
1 changed files with 2 additions and 2 deletions
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4
scripts/genksyms/parse.y
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@ -383,8 +383,8 @@ abstract_declarator:
ptr_operator
| ptr_operator abstract_declarator
{ $$ = $2 ? $2 : $1; }
| direct_abstract_declarator
{ $$ = $1; dont_want_type_specifier = false; }
| direct_abstract_declarator attribute_opt
{ $$ = $2; dont_want_type_specifier = false; }
;
direct_abstract_declarator: