dma-mapping-6.0-2022-09-10

dma-mapping fixes for Linux 6.0

 - revert a panic on swiotlb initialization failure (Yu Zhao)
 - fix the lookup for partial syncs in dma-debug (Robin Murphy)
 - fix a shift overflow in swiotlb (Chao Gao)
 - fix a comment typo in swiotlb (Chao Gao)
 - mark a function static now that all abusers are gone
   (Christoph Hellwig)
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