blk_queue_update_dma_alignment(9) centos man page | unix.com

BLK_QUEUE_UPDATE_DMA(9) 					   Block Devices					   BLK_QUEUE_UPDATE_DMA(9)

NAME
       blk_queue_update_dma_alignment - update dma length and memory alignment

SYNOPSIS
       void blk_queue_update_dma_alignment(struct request_queue * q, int mask);

ARGUMENTS
       q
	   the request queue for the device

       mask
	   alignment mask

DESCRIPTION
       update required memory and length alignment for direct dma transactions. If the requested alignment is larger than the current alignment,
       then the current queue alignment is updated to the new value, otherwise it is left alone. The design of this is to allow multiple objects
       (driver, device, transport etc) to set their respective alignments without having them interfere.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   BLK_QUEUE_UPDATE_DMA(9)