tracing: Add hist trigger action 'expected fail' test case

Add a test case verifying that basic action combinations fail as
expected.

Link: http://lkml.kernel.org/r/179[e-mail]

Acked-by: Masami Hiramatsu <[e-mail]>
Signed-off-by: Tom Zanussi <[e-mail]>
Signed-off-by: Steven Rostedt (VMware) <[e-mail]>

tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-action-hist-xfail.tc

···
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+# description: event trigger - test inter-event histogram trigger expected fail actions
+
+fail() { #msg
+    echo $1
+    exit_fail
+}
+
+if [ ! -f set_event ]; then
+    echo "event tracing is not supported"
+    exit_unsupported
+fi
+
+if [ ! -f snapshot ]; then
+    echo "snapshot is not supported"
+    exit_unsupported
+fi
+
+grep -q "snapshot()" README || exit_unsupported # version issue
+
+echo "Test expected snapshot action failure"
+
+echo 'hist:keys=comm:onmatch(sched.sched_wakeup).snapshot()' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger && exit_fail
+
+echo "Test expected save action failure"
+
+echo 'hist:keys=comm:onmatch(sched.sched_wakeup).save(comm,prio)' >> /sys/kernel/debug/tracing/events/sched/sched_waking/trigger && exit_fail
+
+exit_xfail