linux-kernel - Re: [PATCH] module: fix noreturn attribute for __module_put_and

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Date:	Fri, 18 Mar 2016 13:18:24 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] module: fix noreturn attribute for __module_put_and_exit()

Jiri Kosina <jikos@...nel.org> writes:
> __module_put_and_exit() is makred noreturn in module.h declaration, but is 
> lacking the attribute in the definition, which makes some tools (such as 
> sparse) unhappy. Amend the definition with the attribute as well (and 
> reformat the declaration so that it uses more common format).
>
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

Hi Jiri,

        While I'm not sure we shouldn't just fix sparse, we should also
use __noreturn.

Cheers,
Rusty.

> ---
>  include/linux/module.h | 4 ++--
>  kernel/module.c        | 2 +-
>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/module.h b/include/linux/module.h
> index 2bb0c30..4cd52b5 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -562,8 +562,8 @@ int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
>  					     struct module *, unsigned long),
>  				   void *data);
>  
> -extern void __module_put_and_exit(struct module *mod, long code)
> -	__attribute__((noreturn));
> +extern void __attribute__((noreturn)) __module_put_and_exit(struct module *mod,
> +			long code);
>  #define module_put_and_exit(code) __module_put_and_exit(THIS_MODULE, code)
>  
>  #ifdef CONFIG_MODULE_UNLOAD
> diff --git a/kernel/module.c b/kernel/module.c
> index 794ebe8..61f56c2 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -335,7 +335,7 @@ static inline void add_taint_module(struct module *mod, unsigned flag,
>   * A thread that wants to hold a reference to a module only while it
>   * is running can call this to safely exit.  nfsd and lockd use this.
>   */
> -void __module_put_and_exit(struct module *mod, long code)
> +void __attribute__((noreturn)) __module_put_and_exit(struct module *mod, long code)
>  {
>  	module_put(mod);
>  	do_exit(code);
>
> -- 
> Jiri Kosina
> SUSE Labs