selftests/ftrace: Add --stop-fail hidden option for debug

Add --stop-fail option for debugging the ftracetest.

With this option, ftracetest stops right after a testcase
fails instead of finish running all testcases.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan (Samsung OSG) <shuah@kernel.org>

tools/testing/selftests/ftrace/ftracetest

@@ -69,6 +69,10 @@ parse_opts() { # opts
       DEBUG=1
       shift 1
     ;;
+    --stop-fail)
+      STOP_FAILURE=1
+      shift 1
+    ;;
     --fail-unsupported)
       UNSUPPORTED_RESULT=1
       shift 1
@@ -117,6 +121,7 @@ KEEP_LOG=0
 DEBUG=0
 VERBOSE=0
 UNSUPPORTED_RESULT=0
+STOP_FAILURE=0
 # Parse command-line options
 parse_opts $*
 
@@ -304,6 +309,10 @@ run_test() { # testfile
 # Main loop
 for t in $TEST_CASES; do
   run_test $t
+  if [ $STOP_FAILURE -ne 0 -a $TOTAL_RESULT -ne 0 ]; then
+    echo "A failure detected. Stop test."
+    exit 1
+  fi
 done
 
 # Test on instance loop
@@ -315,6 +324,10 @@ for t in $TEST_CASES; do
   run_test $t
   rmdir $TRACING_DIR
   TRACING_DIR=$SAVED_TRACING_DIR
+  if [ $STOP_FAILURE -ne 0 -a $TOTAL_RESULT -ne 0 ]; then
+    echo "A failure detected. Stop test."
+    exit 1
+  fi
 done
 
 prlog ""