linux-kernel - Re: [PATCH 8/9] dspbridge: add map support for big buffers

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Message-ID: <AANLkTinaJ=xn_CAJznVtMcA0nwK_-gbo05OQKM7PuoYA@mail.gmail.com>
Date:	Tue, 24 Aug 2010 21:55:08 +0300
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	"Guzman Lugo, Fernando" <fernando.lugo@...com>
Cc:	"Kanigeri, Hari" <h-kanigeri2@...com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ohad@...ery.com" <ohad@...ery.com>,
	"hiroshi.doyu@...ia.com" <hiroshi.doyu@...ia.com>,
	"ameya.palande@...ia.com" <ameya.palande@...ia.com>,
	"felipe.contreras@...ia.com" <felipe.contreras@...ia.com>
Subject: Re: [PATCH 8/9] dspbridge: add map support for big buffers

On Tue, Aug 24, 2010 at 9:44 PM, Guzman Lugo, Fernando
<fernando.lugo@...com> wrote:
>> However, I still have the question about the dependency on
>> iommu; AFAICS the DMM removal doesn't depend on the migration
>> to iommu, which AFAIK has been stalled for some time.
>
> Yeah, DMM removal does not depend on iommu migration. However,
> After the changes for iommu migration the DMM module is not
> Needed anymore, so it is better to remove it too.

Yes, but there are two options:

a) 1. Migrate to iommu, 2. Remove DMM

or:

b) 1. Remove DMM, 2. Migrate to iommu

I've heard there are some problems regarding DMM, and since you say
you have already done the changes, and since iommu migration is not
yet ready AFAIK, it might make sense to go for option b).

Anyway, thanks for the clarification :)

-- 
Felipe Contreras
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