linux-kernel - Re: [patch v2] x86: allow ZONE

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Message-ID: <4DAFAD9F.4020809@zytor.com>
Date:	Wed, 20 Apr 2011 21:07:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Clemens Ladisch <clemens@...isch.de>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch v2] x86: allow ZONE_DMA to be configurable

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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