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由 Pete Wyckoff 提交于
Let queue_dma_alignment return 0 if it was specifically set to 0. This permits devices with no particular alignment restrictions to use arbitrary user space buffers without copying. Signed-off-by: NPete Wyckoff <pw@osc.edu> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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