ftrace: fix up cmdline recording
The new work with converting the trace hooks over to markers broke the
command line recording of ftrace. This patch fixes it again.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 583fe24..0feae23 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -652,9 +652,6 @@
static int cmdline_idx;
static DEFINE_SPINLOCK(trace_cmdline_lock);
-/* trace in all context switches */
-atomic_t trace_record_cmdline_enabled __read_mostly;
-
/* temporary disable recording */
atomic_t trace_record_cmdline_disabled __read_mostly;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index c460e85..6b8bd88 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -218,6 +218,8 @@
void tracing_start_function_trace(void);
void tracing_stop_function_trace(void);
+void tracing_start_cmdline_record(void);
+void tracing_stop_cmdline_record(void);
int register_tracer(struct tracer *type);
void unregister_tracer(struct tracer *type);
@@ -226,8 +228,6 @@
extern unsigned long tracing_max_latency;
extern unsigned long tracing_thresh;
-extern atomic_t trace_record_cmdline_enabled;
-
void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
void update_max_tr_single(struct trace_array *tr,
struct task_struct *tsk, int cpu);
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 0a08465..7ee7dcd 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -29,14 +29,14 @@
static void start_function_trace(struct trace_array *tr)
{
function_reset(tr);
- atomic_inc(&trace_record_cmdline_enabled);
+ tracing_start_cmdline_record();
tracing_start_function_trace();
}
static void stop_function_trace(struct trace_array *tr)
{
tracing_stop_function_trace();
- atomic_dec(&trace_record_cmdline_enabled);
+ tracing_stop_cmdline_record();
}
static void function_trace_init(struct trace_array *tr)
diff --git a/kernel/trace/trace_sched_switch.c b/kernel/trace/trace_sched_switch.c
index 798ec0d..c16935d 100644
--- a/kernel/trace/trace_sched_switch.c
+++ b/kernel/trace/trace_sched_switch.c
@@ -29,6 +29,9 @@
long disabled;
int cpu;
+ tracing_record_cmdline(prev);
+ tracing_record_cmdline(next);
+
if (!tracer_enabled)
return;
@@ -63,8 +66,6 @@
prev = va_arg(*args, typeof(prev));
next = va_arg(*args, typeof(next));
- tracing_record_cmdline(prev);
-
/*
* If tracer_switch_func only points to the local
* switch func, it still needs the ptr passed to it.
@@ -213,18 +214,26 @@
tracing_sched_unregister();
}
+void tracing_start_cmdline_record(void)
+{
+ tracing_start_sched_switch();
+}
+
+void tracing_stop_cmdline_record(void)
+{
+ tracing_stop_sched_switch();
+}
+
static void start_sched_trace(struct trace_array *tr)
{
sched_switch_reset(tr);
- atomic_inc(&trace_record_cmdline_enabled);
tracer_enabled = 1;
- tracing_start_sched_switch();
+ tracing_start_cmdline_record();
}
static void stop_sched_trace(struct trace_array *tr)
{
- tracing_stop_sched_switch();
- atomic_dec(&trace_record_cmdline_enabled);
+ tracing_stop_cmdline_record();
tracer_enabled = 0;
}