+/**
+ * blk_add_trace_msg - Add a (simple) message to the blktrace stream
+ * @q: queue the io is for
+ * @fmt: format to print message in
+ * args... Variable argument list for format
+ *
+ * Description:
+ * Records a (simple) message onto the blktrace stream.
+ *
+ * NOTE: BLK_TN_MAX_MSG characters are output at most.
+ * NOTE: Can not use 'static inline' due to presence of var args...
+ *
+ **/
+#define blk_add_trace_msg(q, fmt, ...) \
+ do { \
+ struct blk_trace *bt = (q)->blk_trace; \
+ if (unlikely(bt)) \
+ __trace_note_message(bt, fmt, ##__VA_ARGS__); \
+ } while (0)
+#define BLK_TN_MAX_MSG 1024