linux-kernel - Re: [PATCH v3] powerpc/setup_64: fix -Wempty-body warnings

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Date:   Fri, 12 Jul 2019 11:30:27 -0400
From:   Qian Cai <cai@....pw>
To:     mpe@...erman.id.au
Cc:     paulus@...ba.org, benh@...nel.crashing.org,
        tyreld@...ux.vnet.ibm.com, joe@...ches.com,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] powerpc/setup_64: fix -Wempty-body warnings

Ping.

On Fri, 2019-06-28 at 10:03 -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");
> 
> Fix it by using the no_printk() macro, and make sure that format and
> argument are always verified by the compiler.
> 
> Suggested-by: Tyrel Datwyler <tyreld@...ux.vnet.ibm.com>
> Suggested-by: Joe Perches <joe@...ches.com>
> Signed-off-by: Qian Cai <cai@....pw>
> ---
> 
> v3: Use no_printk() macro, and make sure that format and argument are always
>     verified by the compiler using a more generic form ##__VA_ARGS__ per Joe.
> 
> v2: Fix it by using a NOP while loop per Tyrel.
> 
>  arch/powerpc/kernel/setup_64.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index 44b4c432a273..cea933a43f0a 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -69,9 +69,9 @@
>  #include "setup.h"
>  
>  #ifdef DEBUG
> -#define DBG(fmt...) udbg_printf(fmt)
> +#define DBG(fmt, ...) udbg_printf(fmt, ##__VA_ARGS__)
>  #else
> -#define DBG(fmt...)
> +#define DBG(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
>  #endif
>  
>  int spinning_secondaries;