357  * blk_queue_alignment_offset - set physical block alignment offset
359  * @offset: alignment offset in bytes
483  *    attempt to combine the values and ensure proper alignment.
486  *    top device's block sizes and alignment offsets may be adjusted to
487  *    ensure alignment with the bottom device. If no compatible sizes
495 	unsigned int top, bottom, alignment, ret = 0;  in blk_stack_limits()  local
524 	alignment = queue_limit_alignment_offset(b, start);  in blk_stack_limits()
526 	/* Bottom device has different alignment.  Check that it is  in blk_stack_limits()
527 	 * compatible with the current top alignment.  in blk_stack_limits()
529 	if (t->alignment_offset != alignment) {  in blk_stack_limits()
533 		bottom = max(b->physical_block_size, b->io_min) + alignment;  in blk_stack_limits()
588 	t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment)  in blk_stack_limits()
597 	/* Discard alignment and granularity */  in blk_stack_limits()
599 		alignment = queue_limit_discard_alignment(b, start);  in blk_stack_limits()
602 		    t->discard_alignment != alignment) {  in blk_stack_limits()
604 			bottom = b->discard_granularity + alignment;  in blk_stack_limits()
617 		t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) %  in blk_stack_limits()
711  * blk_queue_dma_alignment - set dma length and memory alignment
713  * @mask:  alignment mask
716  *    set required memory and length alignment for direct dma transactions.
727  * blk_queue_update_dma_alignment - update dma length and memory alignment
729  * @mask:  alignment mask
732  *    update required memory and length alignment for direct dma transactions.
733  *    If the requested alignment is larger than the current alignment, then
734  *    the current queue alignment is updated to the new value, otherwise it