Re: [dpdk-dev] [PATCH] fix rte_memcpy() macro: avoid unused value warning

["Qiu, Michael" <michael.qiu@intel.com>]

On 12/16/2014 12:55 AM, Michal Jastrzebski wrote:
> From: Pawel Wodkowski <pawelx.wodkowski@intel.com>
>
> This change use statements in expressions C extension provided by gcc to avoid
> 'value computed is not used' warning/error when size is not known at compile
> time.
>
> Comments on possible side effects are welcome an tests are welcome.
>
> Reported-by: Qiu, Michael <michael.qiu@intel.com>
> Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
> ---
>  .../common/include/arch/x86/rte_memcpy.h           |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
> index 290c5cd..c3e8b81 100644
> --- a/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
> +++ b/lib/librte_eal/common/include/arch/x86/rte_memcpy.h
> @@ -169,9 +169,9 @@ rte_mov256(uint8_t *dst, const uint8_t *src)
>  }
>  
>  #define rte_memcpy(dst, src, n)              \
> -	((__builtin_constant_p(n)) ?          \
> +	({ (__builtin_constant_p(n)) ?          \
>  	memcpy((dst), (src), (n)) :          \
> -	rte_memcpy_func((dst), (src), (n)))
> +	rte_memcpy_func((dst), (src), (n)); })
>  
>  static inline void *
>  rte_memcpy_func(void *dst, const void *src, size_t n)

Acked-by: Qiu, Michael <michael.qiu@intel.com>