On Tue, Jan 23, 2018 at 04:39:58PM -0800, Bart Van Assche wrote: > Since we want to remove the single queue code from the SCSI core > at the appropriate time and since scsi-mq performs better than > scsi-sq even when using only a single hardware queue, use scsi-mq > if it has been enabled. scsi_debug already always uses scsi-mq if enabled. The somewhat misnamed sdebug_mq_active variable is only used for decoding multiqueue tags. That being said the blk_mq_unique_tag* helpers should be safe to use even without blk-mq, so the variable could probably just be removed entirely.
