linux-kernel - Re: [PATCH] appletalk: Fix compile regression

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Message-ID: <9d4884eb-eee7-334f-801c-e3089d296308@huawei.com>
Date:   Wed, 6 Mar 2019 10:24:09 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] appletalk: Fix compile regression


On 2019/3/5 21:24, Arnd Bergmann wrote:
> A bugfix just broke compilation of appletalk when CONFIG_SYSCTL
> is disabled:
> 
> In file included from net/appletalk/ddp.c:65:
> net/appletalk/ddp.c: In function 'atalk_init':
> include/linux/atalk.h:164:34: error: expected expression before 'do'
>  #define atalk_register_sysctl()  do { } while(0)
>                                   ^~
> net/appletalk/ddp.c:1934:7: note: in expansion of macro 'atalk_register_sysctl'
>   rc = atalk_register_sysctl();
> 
> This is easier to avoid by using conventional inline functions
> as stubs rather than macros. The header already has inline
> functions for other purposes, so I'm changing over all the
> macros for consistency.
> 

Thank you for fix this


> Fixes: 6377f787aeb9 ("appletalk: Fix use-after-free in atalk_proc_exit")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  include/linux/atalk.h | 18 ++++++++++++++----
>  1 file changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/include/linux/atalk.h b/include/linux/atalk.h
> index 5a90f28d5ff2..d5cfc0b15b76 100644
> --- a/include/linux/atalk.h
> +++ b/include/linux/atalk.h
> @@ -161,16 +161,26 @@ extern int sysctl_aarp_resolve_time;
>  extern int atalk_register_sysctl(void);
>  extern void atalk_unregister_sysctl(void);
>  #else
> -#define atalk_register_sysctl()		do { } while(0)
> -#define atalk_unregister_sysctl()	do { } while(0)
> +static inline int atalk_register_sysctl(void)
> +{
> +	return 0;
> +}
> +static inline void atalk_unregister_sysctl(void)
> +{
> +}
>  #endif
>  
>  #ifdef CONFIG_PROC_FS
>  extern int atalk_proc_init(void);
>  extern void atalk_proc_exit(void);
>  #else
> -#define atalk_proc_init()	({ 0; })
> -#define atalk_proc_exit()	do { } while(0)
> +static inline int atalk_proc_init(void)
> +{
> +	return 0;
> +}
> +static inline void atalk_proc_exit(void)
> +{
> +}
>  #endif /* CONFIG_PROC_FS */
>  
>  #endif /* __LINUX_ATALK_H__ */
>