1 files changed, 14 insertions, 0 deletions
diff --git a/block/blktrace.c b/block/blktrace.c
index b2cbb4e5d76..20e11f354f1 100644
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -75,6 +75,20 @@ static void trace_note_time(struct blk_trace *bt)
 	local_irq_restore(flags);
 }
 
+void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
+{
+	int n;
+	va_list args;
+	static char bt_msg_buf[BLK_TN_MAX_MSG];
+
+	va_start(args, fmt);
+	n = vscnprintf(bt_msg_buf, BLK_TN_MAX_MSG, fmt, args);
+	va_end(args);
+
+	trace_note(bt, 0, BLK_TN_MESSAGE, bt_msg_buf, n);
+}
+EXPORT_SYMBOL_GPL(__trace_note_message);
+
 static int act_log_check(struct blk_trace *bt, u32 what, sector_t sector,
 			 pid_t pid)
 {