Re: [patch v2] x86: allow ZONE_DMA to be configurable

[H. Peter Anvin]

On 04/20/2011 07:31 PM, David Rientjes wrote:
>>
>> This isn't really a very good edit, as ZONE_DMA isn't inherently limited
>> to ISA/LPC devices (and LPC devices which do LPC-native bus mastering
>> DMA are not affected.)  ZONE_DMA is used even for some PCI devices which
>> have restrictions on the DMA address mask.
>>
> 
> Peter, do you think we can merge this patch now?  The discussion from 
> October resulted in the decision to rename CONFIG_EMBEDDED to 
> CONFIG_EXPERT and make CONFIG_GENERIC_ISA_DMA and CONFIG_ISA_DMA_API 
> configurable for x86.  That's all been done via the -mm tree and is in the 
> latest git.
> 
> We've run without ZONE_DMA for a few years without issues (and, obviously, 
> this patch) on x86.

Please address the documentation issues.  ZONE_DMA is *NOT* just for
"old ISA devices" -- there are plenty of other devices with restricted
DMA masks.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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