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To support "hybrid" DMA ops in a subsequent patch, we will need both a direct DMA offset and an iommu pointer. Those are currently exclusive (a union), so change them to be separate fields. While there, also type iommu_table_base properly and make exist only on CONFIG_PPC64 since it's not referenced on 32-bit at all. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>