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Subject: Re: use generic DMA mapping code in powerpc V4
From:   Christian Zigotzky <chzigotzky@xenosoft.de>
To:     Christoph Hellwig <hch@lst.de>
Cc:     linux-arch@vger.kernel.org,
        Darren Stevens <darren@stevens-zone.net>,
        linux-kernel@vger.kernel.org, Julian Margetson <runaway@candw.ms>,
        linux-mm@kvack.org, iommu@lists.linux-foundation.org,
        Paul Mackerras <paulus@samba.org>,
        Olof Johansson <olof@lixom.net>, linuxppc-dev@lists.ozlabs.org
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Message-ID: <84558d7f-5a7f-5219-0c3a-045e6b4c494f@xenosoft.de>
Date:   Thu, 13 Dec 2018 09:41:50 +0100
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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@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