BLK_QUEUE_UPDATE_DMA(9) Block Devices BLK_QUEUE_UPDATE_DMA(9)NAMEblk_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.
COPYRIGHTKernel Hackers Manual 2.6. November 2013 BLK_QUEUE_UPDATE_DMA(9)