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iov_iter: Define flags to qualify page extraction.
Define flags to qualify page extraction to pass into iov_iter_*_pages*() rather than passing in FOLL_* flags. For now only a flag to allow peer-to-peer DMA is supported. Signed-off-by: David Howells <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]> Reviewed-by: John Hubbard <[email protected]> Reviewed-by: Jens Axboe <[email protected]> cc: Al Viro <[email protected]> cc: Logan Gunthorpe <[email protected]> cc: [email protected] cc: [email protected] Signed-off-by: Steve French <[email protected]>
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