selftests/ftrace: Replace echo -e with printf

echo -e is not POSIX. Depending on what /bin/sh is, we can get
incorrect output like:
$ -e -n [1] Basic trace file check
$ -e 	[PASS]

Fix that by using printf instead.

Acked-by: Steven Rostedt (VMware) <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Juerg Haefliger <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

1 files changed, 7 insertions, 2 deletions

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 75244db70331..2e5e66774dbb 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -173,8 +173,13 @@ strip_esc() {
 }
 
 prlog() { # messages
-  echo -e "$@"
-  [ "$LOG_FILE" ] && echo -e "$@" | strip_esc >> $LOG_FILE
+  newline="\n"
+  if [ "$1" = "-n" ] ; then
+    newline=
+    shift
+  fi
+  printf "$*$newline"
+  [ "$LOG_FILE" ] && printf "$*$newline" | strip_esc >> $LOG_FILE
 }
 catlog() { #file
   cat $1