ftrace: fix comm on function trace output

In cleaning up of the sched_switch code, the function trace recording
of task comms was removed. This patch adds back the recording of comms
for function trace. The output of ftrace now has the task comm instead
of <...>.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 4165d34bd28a..0a084656d7cf 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -29,12 +29,14 @@ static void function_reset(struct trace_array *tr)
 static void start_function_trace(struct trace_array *tr)
 {
         function_reset(tr);
+        atomic_inc(&trace_record_cmdline_enabled);
         tracing_start_function_trace();
 }
 
 static void stop_function_trace(struct trace_array *tr)
 {
         tracing_stop_function_trace();
+        atomic_dec(&trace_record_cmdline_enabled);
 }
 
 static void function_trace_init(struct trace_array *tr)