BLK_QUEUE_UPDATE_DMA

Section: Block Devices (9)
Updated: February 2011
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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.  

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