[PATCH v3 2/5] selftests: ftrace: Add --fail-unsupported option

[Masami Hiramatsu <mhiramat@kernel.org>]

Add --fail-unsupported option to fail the test result if
ftracetest gets UNSUPPORTED result. UNSUPPORTED usually
happens when the kernel is old (e.g. stable tree) or some
kernel feature is disabled.

However, if newer kernel has any bug or regression, it
can make test results in UNSUPPORTED too. This option
can detect such kernel regression.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/testing/selftests/ftrace/ftracetest |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
index 290cd42..e033f54 100755
--- a/tools/testing/selftests/ftrace/ftracetest
+++ b/tools/testing/selftests/ftrace/ftracetest
@@ -15,6 +15,7 @@ echo "		-h|--help  Show help message"
 echo "		-k|--keep  Keep passed test logs"
 echo "		-v|--verbose Increase verbosity of test messages"
 echo "		-vv        Alias of -v -v (Show all results in stdout)"
+echo "		--fail-unsupported Treat UNSUPPORTED as a failure"
 echo "		-d|--debug Debug mode (trace all shell commands)"
 echo "		-l|--logdir <dir> Save logs on the <dir>"
 exit $1
@@ -65,6 +66,10 @@ parse_opts() { # opts
       DEBUG=1
       shift 1
     ;;
+    --fail-unsupported)
+      UNSUPPORTED_RESULT=1
+      shift 1
+    ;;
     --logdir|-l)
       LOG_DIR=$2
       shift 2
@@ -108,6 +113,7 @@ LOG_DIR=$TOP_DIR/logs/`date +%Y%m%d-%H%M%S`/
 KEEP_LOG=0
 DEBUG=0
 VERBOSE=0
+UNSUPPORTED_RESULT=0
 # Parse command-line options
 parse_opts $*
 
@@ -187,7 +193,7 @@ eval_result() { # sigval
     $UNSUPPORTED)
       prlog "	[UNSUPPORTED]"
       UNSUPPORTED_CASES="$UNSUPPORTED_CASES $CASENO"
-      return 0 # this is not a bug.
+      return $UNSUPPORTED_RESULT # depends on use case
     ;;
     $XFAIL)
       prlog "	[XFAIL]"