Re: [PATCH 08/32] dmaengine: ste_dma40: Optimise local MAX() macro

[Vinod Koul]

On Thu, Apr 18, 2013 at 11:11:50AM +0100, Lee Jones wrote:
> The current implementation of the DMA40's local MAX() macro evaluates
> its arguments more times than is necessary. This patch strips it
> optimises it to only evaluate what's appropriate.
> 
> Cc: Vinod Koul <vinod.koul@xxxxxxxxx>
> Cc: Dan Williams <djbw@xxxxxx>
> Cc: Per Forlin <per.forlin@xxxxxxxxxxxxxx>
> Cc: Rabin Vincent <rabin@xxxxxx>
> Reported-by: Harvey Harrison <harvey.harrison@xxxxxxxxx>
> Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
> ---
>  drivers/dma/ste_dma40.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
> index b21a8a3..7b451b2 100644
> --- a/drivers/dma/ste_dma40.c
> +++ b/drivers/dma/ste_dma40.c
> @@ -53,7 +53,7 @@
>  #define D40_ALLOC_PHY		BIT(30)
>  #define D40_ALLOC_LOG_FREE	BIT(0)
>  
> -#define MAX(a, b) (((a) < (b)) ? (b) : (a))
> +#define MAX(a, b) ((a > b) ? a : b)
Am not a big fan of own redefines, can you use kernel max() macro instead

--
~Vinod
>  
>  #define D40_IS_SRC(dir)  ((dir == STEDMA40_PERIPH_TO_MEM) ? true : false)
>  #define D40_IS_DST(dir) (((dir == STEDMA40_MEM_TO_PERIPH) || \
> -- 
> 1.7.10.4
> 
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