linux-kernel - Re: [PATCH v8 02/17] arm64: define DMA_ERROR

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Date:	Thu, 10 Oct 2013 10:44:39 +0100
From:	Will Deacon <will.deacon@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>
Subject: Re: [PATCH v8 02/17] arm64: define DMA_ERROR_CODE

On Wed, Oct 09, 2013 at 09:48:15PM +0100, Stefano Stabellini wrote:
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Acked-by: Catalin Marinas <catalin.marinas@....com>
> CC: will.deacon@....com
> ---
>  arch/arm64/include/asm/dma-mapping.h |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
> index 8d18100..c2cb8a0 100644
> --- a/arch/arm64/include/asm/dma-mapping.h
> +++ b/arch/arm64/include/asm/dma-mapping.h
> @@ -25,6 +25,7 @@
>  
>  #define ARCH_HAS_DMA_GET_REQUIRED_MASK
>  
> +#define DMA_ERROR_CODE	(~0)

Hmm, is this guaranteed to be large enough for a dma_addr_t? Other 64-bit
architectures using a non-zero error code cast to dma_addr_t before the
negation.

Will
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