[PATCH 01/12] iommu-common: move to arch/sparc

[Anshuman Khandual]

On 04/16/2018 07:28 PM, David Miller wrote:
> From: Anshuman Khandual <khandual at linux.vnet.ibm.com>
> Date: Mon, 16 Apr 2018 14:26:07 +0530
> 
>> On 04/15/2018 08:29 PM, Christoph Hellwig wrote:
>>> This code is only used by sparc, and all new iommu drivers should use the
>>> drivers/iommu/ framework.  Also remove the unused exports.
>>>
>>> Signed-off-by: Christoph Hellwig <hch at lst.de>
>>
>> Right, these functions are used only from SPARC architecture. Simple
>> git grep confirms it as well. Hence it makes sense to move them into
>> arch code instead.
> 
> Well, we put these into a common location and used type friendly for
> powerpc because we hoped powerpc would convert over to using this
> common piece of code as well.
> 
> But nobody did the powerpc work.
> 
> If you look at the powerpc iommu support, it's the same code basically
> for entry allocation.

I understand. But there are some differences in iommu_table structure,
how both regular and large IOMMU pools are being initialized etc. So
if the movement of code into SPARC help cleaning up these generic config
options in general, I guess we should do that. But I will leave it upto
others who have more experience in this area.

+mpe