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Re: [Xen-devel] [RFC v3 02/45] dma-mapping: Use unsigned long for dma_attrs
- To: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
- From: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
- Date: Fri, 03 Jun 2016 09:50:40 +0200
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- Delivery-date: Fri, 03 Jun 2016 07:51:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 06/03/2016 09:17 AM, Geert Uytterhoeven wrote:
> Hi Krzysztof,
>
> On Thu, Jun 2, 2016 at 5:39 PM, Krzysztof Kozlowski
> <k.kozlowski@xxxxxxxxxxx> wrote:
>> --- a/include/linux/dma-mapping.h
>> +++ b/include/linux/dma-mapping.h
>> @@ -5,13 +5,25 @@
>
>> +/**
>> + * List of possible attributes associated with a DMA mapping. The semantics
>> + * of each attribute should be defined in Documentation/DMA-attributes.txt.
>> + */
>> +#define DMA_ATTR_WRITE_BARRIER (1UL << 1)
>
> Any particular reason they start at 2, not 1?
No reason. I'll fix this in next version (and trim Cc-list). Anyway the
values of constants won't match old ones but that should not be problem
(unless they are hard-coded somewhere).
Best regards,
Krzysztof
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