[PATCH 5.4 035/165] selftests/ftrace: Fix ftrace test cases to check unsupported

Greg Kroah-Hartman
2020-01-11T10:23:41Z

From: Masami Hiramatsu <mhiramat@kernel.org>

[ Upstream commit 25deae098e748d8d36bc35129a66734b8f6925c9 ]

Since dynamic function tracer can be disabled, set_ftrace_filter
can be disappeared. Test cases which depends on it, must check
whether the set_ftrace_filter exists or not before testing
and if not, return as unsupported.

Also, if the function tracer itself is disabled, we can not
set "function" to current_tracer. Test cases must check it
before testing, and return as unsupported.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc | 2 ++
tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc | 5 +++++
2 files changed, 7 insertions(+)

diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
index 36fb59f886ea..1a52f2883fe0 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
@@ -3,6 +3,8 @@
# description: ftrace - stacktrace filter command
# flags: instance

+[ ! -f set_ftrace_filter ] && exit_unsupported
+
echo _do_fork:stacktrace >> set_ftrace_filter

grep -q "_do_fork:stacktrace:unlimited" set_ftrace_filter
diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc
index 86a1f07ef2ca..71fa3f49e35e 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_cpumask.tc
@@ -15,6 +15,11 @@ if [ $NP -eq 1 ] ;then
exit_unresolved
fi

+if ! grep -q "function" available_tracers ; then
+ echo "Function trace is not enabled"
+ exit_unsupported
+fi
+
ORIG_CPUMASK=`cat tracing_cpumask`

do_reset() {
--
2.20.1