Re: [PATCH] module: Fix device table module aliases

[Alexander Stein <alexander.stein@ew.tq-group.com>]

Am Montag, 20. Oktober 2025, 19:53:40 CEST schrieb Josh Poimboeuf:
> Commit 6717e8f91db7 ("kbuild: Remove 'kmod_' prefix from
> __KBUILD_MODNAME") inadvertently broke module alias generation for
> modules which rely on MODULE_DEVICE_TABLE().
> 
> It removed the "kmod_" prefix from __KBUILD_MODNAME, which caused
> MODULE_DEVICE_TABLE() to generate a symbol name which no longer matched
> the format expected by handle_moddevtable() in scripts/mod/file2alias.c.
> 
> As a result, modpost failed to find the device tables, leading to
> missing module aliases.
> 
> Fix this by explicitly adding the "kmod_" string within the
> MODULE_DEVICE_TABLE() macro itself, restoring the symbol name to the
> format expected by file2alias.c.
> 
> Fixes: 6717e8f91db7 ("kbuild: Remove 'kmod_' prefix from __KBUILD_MODNAME")
> Reported-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
> Reported-by: Mark Brown <broonie@kernel.org>
> Reported-by: Cosmin Tanislav <demonsingur@gmail.com>
> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>

Thanks!

> ---
>  include/linux/module.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/module.h b/include/linux/module.h
> index e135cc79aceea..d80c3ea574726 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -251,10 +251,11 @@ struct module_kobject *lookup_or_create_module_kobject(const char *name);
>   */
>  #define __mod_device_table(type, name)	\
>  	__PASTE(__mod_device_table__,	\
> +	__PASTE(kmod_,			\
>  	__PASTE(__KBUILD_MODNAME,	\
>  	__PASTE(__,			\
>  	__PASTE(type,			\
> -	__PASTE(__, name)))))
> +	__PASTE(__, name))))))
>  
>  /* Creates an alias so file2alias.c can find device table. */
>  #define MODULE_DEVICE_TABLE(type, name)					\
> 


-- 
TQ-Systems GmbH | Mühlstraße 2, Gut Delling | 82229 Seefeld, Germany
Amtsgericht München, HRB 105018
Geschäftsführer: Detlef Schneider, Rüdiger Stahl, Stefan Schneider
http://www.tq-group.com/