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A dma_addr_t is potentially smaller than a phys_addr_t on some archs. Don't truncate the address when doing the pfn conversion. Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Reported-by: Matthew Wilcox <willy@linux.intel.com> [willy: fix pfn_t_to_phys as well] Signed-off-by: Dan Williams <dan.j.williams@intel.com>