Re: [PATCH] dma-mapping: harmonize definition of DMA_ERROR_CODE

[Marek Szyprowski <m.szyprowski@samsung.com>]

Hello,

On 2015-06-10 10:41, Nicholas Mc Guire wrote:
> All architectures except arm that define DMA_ERROR_CODE are casting it
> to (dma_addr_t) - as it is always compared to dma_addr_t in arm as well
> this could be harmonized.
>
> Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>

Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>

> ---
>
> This also fixes the build warning in
> ./arch/arm/include/asm/dma-mapping.h: In function 'dma_mapping_error':
> ./arch/arm/include/asm/dma-mapping.h:176:18: warning: comparison between
> signed and unsigned integer expressions [-Wsign-compare]
>
> While it fixes this build warning it causes another build warning - so
> from that perspective its not much of an improvement - never the less
> having this harmonized with all other archs makes sense I think.
>
> Patch was compile tested with exynos_defconfig
>
> Patch is against 4.1-rc7 (localversion-next is -next-20150609)
>
>   arch/arm/include/asm/dma-mapping.h |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
> index b52101d..68e41e8 100644
> --- a/arch/arm/include/asm/dma-mapping.h
> +++ b/arch/arm/include/asm/dma-mapping.h
> @@ -14,7 +14,7 @@
>   #include <xen/xen.h>
>   #include <asm/xen/hypervisor.h>
>   
> -#define DMA_ERROR_CODE	(~0)
> +#define DMA_ERROR_CODE	(~(dma_addr_t)0x0)
>   extern struct dma_map_ops arm_dma_ops;
>   extern struct dma_map_ops arm_coherent_dma_ops;
>   

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland