linux-kernel - Re: [PATCH V2 2/3] powerpc: Add support for swiotlb on 32-bit

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Message-Id: <E6F31282-646E-46B6-9D5B-B39D4595C984@kernel.crashing.org>
Date:	Wed, 27 May 2009 17:11:57 -0500
From:	Becky Bruce <beckyb@...nel.crashing.org>
To:	Ian Campbell <Ian.Campbell@...citrix.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	"linuxppc-dev@...abs.org" <linuxppc-dev@...abs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/3] powerpc: Add support for swiotlb on 32-bit


On May 27, 2009, at 3:29 PM, Ian Campbell wrote:

> On Wed, 2009-05-27 at 15:05 -0400, Becky Bruce wrote:
>> On May 22, 2009, at 6:11 AM, Ian Campbell wrote:
>>>
>>>
>>> BTW do you need swiotlb_bus_to_virt to be __weak or is the fact that
>>> it
>>> is implemented in terms of swiotlb_bus_to_phys sufficient?
>>
>> The default one in swiotlb calls phys_to_virt on the result of
>> swiotlb_bus_to_phys, which only works on lowmem.
>
> Perhaps we can simply enhance the default one to handle highmem  
> instead
> of making it arch specific?

That's fine by me - as long as what I've got will work for you guys  
I'm happy to stick it in the standard one (inside a nice pretty #ifdef  
CONFIG_HIGHMEM, of course).

Cheers,
B
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