[PATCHv2 3/5] logger: Log to the FTrace buffer if tracing is enabled

[Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>]

From: Kieran Bingham <kieran.bingham@ideasonboard.com>

Extend the logger such that it will detect the tracing system, and also
append print statement to this ring buffer.

This provides the relevant logging output interspersed in the ftrace
logs for an effective solution to identifying the actions that caused
the traces to occur

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 scripts/logger.sh | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/scripts/logger.sh b/scripts/logger.sh
index 8123f0c9f6e3..8412b0ba9a08 100755
--- a/scripts/logger.sh
+++ b/scripts/logger.sh
@@ -6,6 +6,17 @@ now() {
 
 label=${1:+ [$1]}
 
+TRACE_MARKER=/sys/kernel/debug/tracing/trace_marker
+if [ -e $TRACE_MARKER ]; then
+	extra_log_files=$TRACE_MARKER
+fi
+
 while read line ; do
-	echo "$(now)$label $line"
+	newline="$(now)$label $line"
+
+	echo "$newline"
+
+	for f in $extra_log_files; do
+		echo "$newline" >> $f;
+	done;
 done
-- 
2.7.4