blk_add_trace_msg
blk_add_trace_msg((bfqd)->queue, "%s " fmt, pid_str, ##args); \
blk_add_trace_msg((bfqd)->queue, "bfq " fmt, ##args)
blk_add_trace_msg(__td->queue, "throtl " fmt, ##args); \
blk_add_trace_msg(q, "elv switch: %s", ctx->name);
blk_add_trace_msg((mddev)->gendisk->queue, fmt, ##args); \
blk_add_trace_msg(mddev->gendisk->queue,