ftracetest: Add functions file that holds helper functions

Created the file tools/testing/ftrace/test.d/functions that will
hold helper functions.

Current helper functions include:

 Add clear_trace() helper to reset the trace file

   Used as a descriptive name to show that "echo > trace" is clearing
   the trace file.

 Add disable/enable_tracing() helper calls

   Add calls that disable and enable tracing respectively by echoing
   0 or 1 into tracing_on.

 Add helper reset_tracer() function

    Add a helper function reset_tracer() that will clear the current_tracer
    (echo nop > current_tracer).

Link: http://lkml.kernel.org/r/20141103212737.696365174@goodmis.org
Link: http://lkml.kernel.org/r/20141104153028.465517119@goodmis.org

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
new file mode 100644
index 000000000000..5d8cd06d920f
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/functions
@@ -0,0 +1,16 @@
+
+clear_trace() { # reset trace output
+    echo > trace
+}
+
+disable_tracing() { # stop trace recording
+    echo 0 > tracing_on
+}
+
+enable_tracing() { # start trace recording
+    echo 1 > tracing_on
+}
+
+reset_tracer() { # reset the current tracer
+    echo nop > current_tracer
+}