linux-kernel - Re: [PATCH v2] powerpc/mm/radix: use do/while(0) trick for single statement block

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Date:   Mon, 23 Apr 2018 14:13:44 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Mathieu Malaterre <malat@...ian.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc/mm/radix: use do/while(0) trick for single
 statement block

On 04/23/18 12:36, Mathieu Malaterre wrote:
> In commit 7a22d6321c3d ("powerpc/mm/radix: Update command line parsing for
> disable_radix") an `if` statement was added for a possible empty body
> (prom_debug).
> 
> Fix the following warning, treated as error with W=1:
> 
>   arch/powerpc/kernel/prom_init.c:656:46: error: suggest braces around empty body in an ‘if’ statement [-Werror=empty-body]
> 
> Suggested-by: Randy Dunlap <rdunlap@...radead.org>
> Signed-off-by: Mathieu Malaterre <malat@...ian.org>

Acked-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
> v2: update macro directly
> 
>  arch/powerpc/kernel/prom_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c
> index 5ae153b97d0a..7edf3aa5bc6d 100644
> --- a/arch/powerpc/kernel/prom_init.c
> +++ b/arch/powerpc/kernel/prom_init.c
> @@ -103,7 +103,7 @@ int of_workarounds;
>  #ifdef DEBUG_PROM
>  #define prom_debug(x...)	prom_printf(x)
>  #else
> -#define prom_debug(x...)
> +#define prom_debug(x...)	do { } while (0)
>  #endif
>  
>  
> 


-- 
~Randy