linux-kernel - Re: [PATCH] modules: mark __inittest/__exittest as __maybe

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Message-ID: <87inot9c7e.fsf@rustcorp.com.au>
Date:   Thu, 02 Feb 2017 19:55:09 +1030
From:   Rusty Russell <rusty@...tcorp.com.au>
To:     Arnd Bergmann <arnd@...db.de>, Jessica Yu <jeyu@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Jiri Kosina <jikos@...nel.org>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Miroslav Benes <mbenes@...e.cz>,
        Anson Jacob <ansonjacob.aj@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] modules: mark __inittest/__exittest as __maybe_unused

Arnd Bergmann <arnd@...db.de> writes:
> clang warns about unused inline functions by default:
>
> arch/arm/crypto/aes-cipher-glue.c:68:1: warning: unused function '__inittest' [-Wunused-function]
> arch/arm/crypto/aes-cipher-glue.c:69:1: warning: unused function '__exittest' [-Wunused-function]
>
> As these appear in every single module, let's just disable the warnings by marking the
> two functions as __maybe_unused.

Um, won't you have to do that to hundreds of kernel headers?  Why
module.h?

Confused,
Rusty.

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/module.h | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/module.h b/include/linux/module.h
> index 38b4b2c754c8..48a5c57c858e 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -126,13 +126,13 @@ extern void cleanup_module(void);
>  
>  /* Each module must use one module_init(). */
>  #define module_init(initfn)					\
> -	static inline initcall_t __inittest(void)		\
> +	static inline initcall_t __maybe_unused __inittest(void)		\
>  	{ return initfn; }					\
>  	int init_module(void) __attribute__((alias(#initfn)));
>  
>  /* This is only required if you want to be unloadable. */
>  #define module_exit(exitfn)					\
> -	static inline exitcall_t __exittest(void)		\
> +	static inline exitcall_t __maybe_unused __exittest(void)		\
>  	{ return exitfn; }					\
>  	void cleanup_module(void) __attribute__((alias(#exitfn)));
>  
> -- 
> 2.9.0