[PATCH 7/7] selftests/ftrace: Return unsupported if it detects older kernel

[Masami Hiramatsu]

Return unsupported if the kernel is too old to support
instance independent ftrace filter for some testcases.

Signed-off-by: Masami Hiramatsu <mhira...@kernel.org>
---
 .../ftrace/test.d/ftrace/func_event_triggers.tc    |    9 +++++++++
 .../test.d/ftrace/func_traceonoff_triggers.tc      |    9 +++++++++
 2 files changed, 18 insertions(+)

diff --git 
a/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc 
b/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc
index aa31368..77dfb6b 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_event_triggers.tc
@@ -72,6 +72,15 @@ run_enable_disable() {
     test_event_enabled $check_disable
 
     echo "schedule:${enable}_event:$EVENT" > set_ftrace_filter
+    if [ -d ../../instances ]; then # Check instances
+       cur=`cat set_ftrace_filter`
+       top=`cat ../../set_ftrace_filter`
+       if [ "$cur" = "$top" ]; then
+           echo "This kernel is too old to support per instance filter"
+           reset_ftrace_filter
+           exit_unsupported
+       fi
+    fi
 
     echo " make sure it works 5 times"
 
diff --git 
a/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc 
b/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
index 1b0817b..9cf3852 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_traceonoff_triggers.tc
@@ -75,6 +75,15 @@ fi
 echo '** SET TRACEOFF'
 
 echo "$func:traceoff" > set_ftrace_filter
+if [ -d ../../instances ]; then # Check instances
+    cur=`cat set_ftrace_filter`
+    top=`cat ../../set_ftrace_filter`
+    if [ "$cur" = "$top" ]; then
+       echo "This kernel is too old to support per instance filter"
+       reset_ftrace_filter
+       exit_unsupported
+    fi
+fi
 
 cnt=`grep schedule set_ftrace_filter | wc -l`
 if [ $cnt -ne 1 ]; then