asm-generic: introduce be48 unaligned accessors
The NVMe protocol extended the data integrity fields with unaligned 48-bit reference tags. Provide some helper accessors in preparation for these. Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Reviewed-by: NHannes Reinecke <hare@suse.de> Reviewed-by: NChaitanya Kulkarni <kch@nvidia.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NKeith Busch <kbusch@kernel.org> Reviewed-by: NBart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20220303201312.3255347-4-kbusch@kernel.orgSigned-off-by: NJens Axboe <axboe@kernel.dk>
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