dma-pool fixes

Christoph Hellwig hch at
Tue Jul 28 06:47:40 EDT 2020

Hi Amit,

can you try these two patches?  The first one makes sure we don't apply
physical address based checks for IOMMU allocations, and the second one
is a slightly tweaked version of the patch from Nicolas to allow dipping
into the CMA areas for allocations to expand the atomic pools.

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