Add a test case for stacktrace filter command for ftrace.

Signed-off-by: Masami Hiramatsu <[email protected]>
---
 Changes in v3:
 - Remove the last extra line.
 - Run this on an instance too.
---
 .../ftrace/test.d/ftrace/func-filter-stacktrace.tc |   12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 
tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc

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
new file mode 100644
index 000000000000..bf72e783d014
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-stacktrace.tc
@@ -0,0 +1,12 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL2.0
+# description: ftrace - stacktrace filter command
+# flags: instance
+
+echo _do_fork:stacktrace >> set_ftrace_filter
+
+grep -q "_do_fork:stacktrace:unlimited" set_ftrace_filter
+
+(echo "forked"; sleep 1)
+
+grep -q "<stack trace>" trace

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