use generic DMA mapping code in powerpc V4

[Christian Zigotzky]

On 13 December 2018 at 10:47AM, Christian Zigotzky wrote:
> On 13 December 2018 at 10:10AM, Christoph Hellwig wrote:
>> On Thu, Dec 13, 2018 at 09:41:50AM +0100, Christian Zigotzky wrote:
>>> 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.
>> Hmm, I don't think this is the case.  This is my local git log output:
>>
>> commit 83a4b87de6bc6a75b500c9959de88e2157fbcd7c
>> Author: Christoph Hellwig <hch at lst.de>
>> Date:   Wed Dec 12 15:07:49 2018 +0100
>>
>>      get_required_mask
>>
>> commit 977706f9755d2d697aa6f45b4f9f0e07516efeda
>> Author: Christoph Hellwig <hch at lst.de>
>> Date:   Sat Nov 10 22:34:27 2018 +0100
>>
>>      powerpc/dma: remove dma_nommu_mmap_coherent
>>
>> I've also pushed a git branch with these out to:
>>
>>      git://git.infradead.org/users/hch/misc.git powerpc-dma.5-debug
>>
> Sorry Christioph. I was wrong. The first patch isn't included in the 
> last good commit. I will try it again. I can only test beside my main 
> work. That means it takes longer.
>
> -- Christian
>
>
I tried it again but I get the following error message:

MODPOST vmlinux.o
arch/powerpc/kernel/dma-iommu.o: In function `.dma_iommu_get_required_mask':
(.text+0x274): undefined reference to `.dma_direct_get_required_mask'
make: *** [vmlinux] Error 1