Re: swiotlb cleanups v2

Any comments? I would be good to make some progress on this series
as the base for the various additional pools.

On Mon, Mar 01, 2021 at 08:44:22AM +0100, Christoph Hellwig wrote:

Hi Konrad,

this series contains a bunch of swiotlb cleanups, mostly to reduce the
amount of internals exposed to code outside of swiotlb.c, which should
helper to prepare for supporting multiple different bounce buffer pools.

Changes since v1:
 - rebased to v5.12-rc1
 - a few more cleanups
 - merge and forward port the patch from Claire to move all the global
   variables into a struct to prepare for multiple instances
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