linux-kernel - Re: [PATCH v2] powerpc/setup_64: fix -Wempty-body warnings

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Message-ID: <1561665166.5154.90.camel@lca.pw>
Date:   Thu, 27 Jun 2019 15:52:46 -0400
From:   Qian Cai <cai@....pw>
To:     mpe@...erman.id.au
Cc:     paulus@...ba.org, benh@...nel.crashing.org,
        tyreld@...ux.vnet.ibm.com, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] powerpc/setup_64: fix -Wempty-body warnings

Ping.

On Wed, 2019-06-05 at 16:53 -0400, Qian Cai wrote:
> At the beginning of setup_64.c, it has,
> 
>   #ifdef DEBUG
>   #define DBG(fmt...) udbg_printf(fmt)
>   #else
>   #define DBG(fmt...)
>   #endif
> 
> where DBG() could be compiled away, and generate warnings,
> 
> arch/powerpc/kernel/setup_64.c: In function 'initialize_cache_info':
> arch/powerpc/kernel/setup_64.c:579:49: warning: suggest braces around
> empty body in an 'if' statement [-Wempty-body]
>     DBG("Argh, can't find dcache properties !\n");
>                                                  ^
> arch/powerpc/kernel/setup_64.c:582:49: warning: suggest braces around
> empty body in an 'if' statement [-Wempty-body]
>     DBG("Argh, can't find icache properties !\n");
> 
> Suggested-by: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
> Signed-off-by: Qian Cai <cai@....pw>
> ---
> 
> v2: fix it by using a NOP while loop.
> 
>  arch/powerpc/kernel/setup_64.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index 44b4c432a273..bed4ae8d338c 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -71,7 +71,7 @@
>  #ifdef DEBUG
>  #define DBG(fmt...) udbg_printf(fmt)
>  #else
> -#define DBG(fmt...)
> +#define DBG(fmt...) do { } while (0)
>  #endif
>  
>  int spinning_secondaries;