linux-kernel - Re: module: Remove const attribute from alias for MODULE_DEVICE

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Date:   Sat, 29 Jul 2017 23:48:25 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Rusty Russell <rusty@...tcorp.com.au>,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <mmarek@...e.com>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        Doug Anderson <dianders@...omium.org>,
        Grant Grundler <grundler@...omium.org>,
        Greg Hackmann <ghackmann@...gle.com>,
        Michael Davidson <md@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Bernhard.Rosenkranzer@...aro.org
Subject: Re: module: Remove const attribute from alias for MODULE_DEVICE_TABLE

+++ Matthias Kaehlcke [24/07/17 18:27 -0700]:
>MODULE_DEVICE_TABLE(type, name) creates an alias of type 'extern const
>typeof(name)'. If 'name' is already constant the 'const' attribute is
>specified twice, which is not allowed in C89 (see discussion at
>https://lkml.org/lkml/2017/5/23/1440). Since the kernel is built with
>-std=gnu89 clang generates warnings like this:
>
>drivers/thermal/x86_pkg_temp_thermal.c:509:1: warning: duplicate 'const'
>  declaration specifier
>      [-Wduplicate-decl-specifier]
>MODULE_DEVICE_TABLE(x86cpu, pkg_temp_thermal_ids);
>^
>./include/linux/module.h:212:8: note: expanded from macro 'MODULE_DEVICE_TABLE'
>extern const typeof(name) __mod_##type##__##name##_device_table
>
>Remove the const attribute from the alias to avoid the duplicate
>specifier. After all it is only an alias and the attribute shouldn't
>have any effect.
>
>Signed-off-by: Matthias Kaehlcke <mka@...omium.org>

Applied, thanks!

Jessica

> include/linux/module.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/include/linux/module.h b/include/linux/module.h
>index e7bdd549e527..fe5aa3736707 100644
>--- a/include/linux/module.h
>+++ b/include/linux/module.h
>@@ -209,7 +209,7 @@ extern void cleanup_module(void);
> #ifdef MODULE
> /* Creates an alias so file2alias.c can find device table. */
> #define MODULE_DEVICE_TABLE(type, name)					\
>-extern const typeof(name) __mod_##type##__##name##_device_table		\
>+extern typeof(name) __mod_##type##__##name##_device_table		\
>   __attribute__ ((unused, alias(__stringify(name))))
> #else  /* !MODULE */
> #define MODULE_DEVICE_TABLE(type, name)
>-- 
>2.14.0.rc0.284.gd933b75aa4-goog
>