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

On Mon, Apr 16, 2018 at 09:58:33AM -0400, David Miller wrote:

From: Anshuman Khandual <redacted>
Date: Mon, 16 Apr 2018 14:26:07 +0530

quoted

On 04/15/2018 08:29 PM, Christoph Hellwig wrote:

quoted

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@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 could also introduce a new config symbol and keep it in common code,
but it has been there for a while without any new user.

Right now it just means we built the code for everyone who selects
CONFIG_IOMMU_HELPER, which is just about anyone these days.