[PATCH] arm: dma-mapping: add cast to DMA_ERROR_CODE

[Dirk Behme]

On 15.08.2015 17:52, Dirk Behme wrote:
> Fix the compiler warning
>
> ./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]
>    return dma_addr == DMA_ERROR_CODE;
>                    ^
>
> we get building the kernel with W=1.
>
> This is done the same way we have already in the arm64 version.
>
> Signed-off-by: Dirk Behme <dirk.behme at gmail.com>
> ---
>   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)0)
>   extern struct dma_map_ops arm_dma_ops;
>   extern struct dma_map_ops arm_coherent_dma_ops;


I've put this as 8420/1 into the patch system:

http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=8420/1

Any comments on this?

Best regards

Dirk