use generic DMA mapping code in powerpc V4

[Christian Zigotzky]

On 12 December 2018 at 3:39PM, Christian Zigotzky wrote:
> Hi Christoph,
>
> Thanks a lot for your reply. I will test your patches tomorrow.
>
> Cheers,
> Christian
>
> Sent from my iPhone
>
>> On 12. Dec 2018, at 15:15, Christoph Hellwig <hch at lst.de> wrote:
>>
>> Thanks for bisecting.  I've spent some time going over the conversion
>> but can't really pinpoint it.  I have three little patches that switch
>> parts of the code to the generic version.  This is on top of the
>> last good commmit (977706f9755d2d697aa6f45b4f9f0e07516efeda).
>>
>> Can you check with whіch one things stop working?
>>
>>
>> <0001-get_required_mask.patch>
>> <0002-swiotlb-dma_supported.patch>
>> <0003-nommu-dma_supported.patch>
>> <0004-alloc-free.patch>

Today I tried the first patch (0001-get_required_mask.patch) with the 
last good commit (977706f9755d2d697aa6f45b4f9f0e07516efeda). 
Unfortunately this patch is already included in the last good commit 
(977706f9755d2d697aa6f45b4f9f0e07516efeda). I will try the next patch.

-- Christian