linux-kernel - Re: [PATCH] fsldma: add support to 36-bit physical address

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Message-ID: <AANLkTinfHQGqWx2txwG4-nORcwcFD9dYstmVv8iK9oZ8@mail.gmail.com>
Date:	Thu, 23 Sep 2010 15:11:57 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Timur Tabi <timur.tabi@...il.com>,
	Scott Wood <scottwood@...escale.com>,
	Dan Malek <ppc6dev@...italdans.com>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	Becky Bruce <beckyb@...nel.crashing.org>
Subject: Re: [PATCH] fsldma: add support to 36-bit physical address

On Tue, Sep 21, 2010 at 10:41 PM, Kumar Gala <galak@...nel.crashing.org> wrote:
>
> On Sep 21, 2010, at 5:34 PM, Timur Tabi wrote:
>
>> On Tue, Sep 21, 2010 at 5:17 PM, Scott Wood <scottwood@...escale.com> wrote:
>>
>>> It needs to be the actual device that is performing the DMA -- the
>>> platform may need to do things such as IOMMU manipulation where
>>> knowing the device matters.
>>
>> Ok, this all makes sense.  So it appears that the patch is valid, at
>> least in theory.  I would like to see some testing of it, but I
>> realize that may be too difficult.  There's no easy way to force an
>> allocation above 4GB.
>
> I think the patch is pretty safe w/o testing.  However I agree we need a better solution to testing 36-bit addressing.

I'll take that as an acked-by, but I'll wait for the next version of
the patch with the completed changelog before acting on it.

--
Dan
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