From: "Steven Rostedt (VMware)" <rost...@goodmis.org> 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.ga195...@google.com Reported-by: Joel Fernandes <j...@joelfernandes.org> Signed-off-by: Steven Rostedt (VMware) <rost...@goodmis.org> --- kernel/trace/trace.h | 5 +++++ kernel/trace/trace_functions_graph.c | 4 ++++ 2 files changed, 9 insertions(+) diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index f67060a75f38..ab16eca76e59 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -862,7 +862,12 @@ static __always_inline bool ftrace_hash_empty(struct ftrace_hash *hash) #define TRACE_GRAPH_PRINT_FILL_MASK (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT) extern void ftrace_graph_sleep_time_control(bool enable); + +#ifdef CONFIG_FUNCTION_PROFILER extern void ftrace_graph_graph_time_control(bool enable); +#else +static inline void ftrace_graph_graph_time_control(bool enable) { } +#endif extern enum print_line_t print_graph_function_flags(struct trace_iterator *iter, u32 flags); 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 */ }; -- 2.19.1
