swiotlb-xen: ensure we have a single callsite for xen_dma_map_page
Refactor the code a bit to make further changes easier. Reviewed-by: NStefano Stabellini <sstabellini@kernel.org> Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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