function_graph: Do not expose the graph_time option when profiler is not configured

When the function profiler is not configured, the "graph_time" option is
meaningless, as the function profiler is the only thing that makes use of
it. Do not expose it if the profiler is not configured.

Link: http://lkml.kernel.org/r/20181123061133.GA195223@google.com

Reported-by: Joel Fernandes <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index eaf9b1629956..855c13c61e77 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -60,8 +60,12 @@ static struct tracer_opt trace_opts[] = {
         { TRACER_OPT(funcgraph-tail, TRACE_GRAPH_PRINT_TAIL) },
         /* Include sleep time (scheduled out) between entry and return */
         { TRACER_OPT(sleep-time, TRACE_GRAPH_SLEEP_TIME) },
+
+#ifdef CONFIG_FUNCTION_PROFILER
         /* Include time within nested functions */
         { TRACER_OPT(graph-time, TRACE_GRAPH_GRAPH_TIME) },
+#endif
+
         { } /* Empty entry */
 };