diff options
Diffstat (limited to 'kernel/trace/trace_functions_graph.c')
| -rw-r--r-- | kernel/trace/trace_functions_graph.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c index 5049fe25ceef..71b2fb068b6b 100644 --- a/kernel/trace/trace_functions_graph.c +++ b/kernel/trace/trace_functions_graph.c @@ -464,7 +464,7 @@ static int graph_trace_init(struct trace_array *tr) else tr->gops->retfunc = trace_graph_return; - /* Make gops functions are visible before we start tracing */ + /* Make gops functions visible before we start tracing */ smp_mb(); ret = register_ftrace_graph(tr->gops); @@ -475,6 +475,28 @@ static int graph_trace_init(struct trace_array *tr) return 0; } +static int ftrace_graph_trace_args(struct trace_array *tr, int set) +{ + trace_func_graph_ent_t entry; + + if (set) + entry = trace_graph_entry_args; + else + entry = trace_graph_entry; + + /* See if there's any changes */ + if (tr->gops->entryfunc == entry) + return 0; + + unregister_ftrace_graph(tr->gops); + + tr->gops->entryfunc = entry; + + /* Make gops functions visible before we start tracing */ + smp_mb(); + return register_ftrace_graph(tr->gops); +} + static void graph_trace_reset(struct trace_array *tr) { tracing_stop_cmdline_record(); @@ -1607,6 +1629,9 @@ func_graph_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set) if (bit == TRACE_GRAPH_GRAPH_TIME) ftrace_graph_graph_time_control(set); + if (bit == TRACE_GRAPH_ARGS) + return ftrace_graph_trace_args(tr, set); + return 0; } |