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/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Acked-by: Masami Hiramatsu <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index f15c0da07aca0a5818eaad98503bc5a7c6181ffa..c6381a9faf83ce40d7696cc4465ebe966e59eda1 100755 (executable)
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -235,6 +235,9 @@ run_test() { # testfile
   fi
 }
 
+# load in the helper functions
+. $TEST_DIR/functions
+
 # Main loop
 for t in $TEST_CASES; do
   run_test $t

diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
new file mode 100644 (file)
index 0000000..5d8cd06
--- /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
+}