tracing/function-graph-tracer: provide a selftest for the function graph tracer

Making it more easy to do a basic regression test for this tracer.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 222f97d336a6..88f8d9d80a93 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -750,6 +750,9 @@ static struct tracer graph_trace __read_mostly = {
         .print_line     = print_graph_function,
         .print_header   = print_graph_headers,
         .flags          = &tracer_flags,
+#ifdef CONFIG_FTRACE_SELFTEST
+        .selftest       = trace_selftest_startup_function_graph,
+#endif
 };
 
 static __init int init_graph_trace(void)