[SCSI] add scsi trace core functions and put trace points

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
Signed-off-by: Kei Tokunaga <tokunaga.keiich@jp.fujitsu.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 7c4a0ca..9cb5df5 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -209,6 +209,7 @@
 
 	return 1;
 }
+EXPORT_SYMBOL(trace_seq_putc);
 
 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 {