diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index 272464bb7c60249fe93e84a4b81a65c85fe654ce..2b74f96d09d531aef703ff40af345ea48fabe476 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -810,6 +810,12 @@ Here is the list of current tracers that may be configured.
 	to draw a graph of function calls similar to C code
 	source.
 
+	Note that the function graph calculates the timings of when the
+	function starts and returns internally and for each instance. If
+	there are two instances that run function graph tracer and traces
+	the same functions, the length of the timings may be slightly off as
+	each read the timestamp separately and not at the same time.
+
   "blk"
 
 	The block tracer. The tracer used by the blktrace user
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f8aebcb01e62cf5e97f98fbeddd862bcf2d9cb9b..b6e40e8791fa76c8f9867a6d2f3ed914d28e3f05 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4122,6 +4122,7 @@ print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 		   preempt_model_none()      ? "server" :
 		   preempt_model_voluntary() ? "desktop" :
 		   preempt_model_full()      ? "preempt" :
+		   preempt_model_lazy()	     ? "lazy"    :
 		   preempt_model_rt()        ? "preempt_rt" :
 		   "unknown",
 		   /* These are reserved for later use */
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index fce064e205706f50e3b64f345b53c0f23bb226ee..a4e799c1e7670a36d95f83c224db61084bd608e0 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -182,6 +182,7 @@ static int irqsoff_graph_entry(struct ftrace_graph_ent *trace,
 	struct trace_array_cpu *data;
 	unsigned long flags;
 	unsigned int trace_ctx;
+	u64 *calltime;
 	int ret;
 
 	if (ftrace_graph_ignore_func(gops, trace))
@@ -199,6 +200,12 @@ static int irqsoff_graph_entry(struct ftrace_graph_ent *trace,
 	if (!func_prolog_dec(tr, &data, &flags))
 		return 0;
 
+	calltime = fgraph_reserve_data(gops->idx, sizeof(*calltime));
+	if (!calltime)
+		return 0;
+
+	*calltime = trace_clock_local();
+
 	trace_ctx = tracing_gen_ctx_flags(flags);
 	ret = __trace_graph_entry(tr, trace, trace_ctx);
 	atomic_dec(&data->disabled);
@@ -213,12 +220,19 @@ static void irqsoff_graph_return(struct ftrace_graph_ret *trace,
 	struct trace_array_cpu *data;
 	unsigned long flags;
 	unsigned int trace_ctx;
+	u64 *calltime;
+	int size;
 
 	ftrace_graph_addr_finish(gops, trace);
 
 	if (!func_prolog_dec(tr, &data, &flags))
 		return;
 
+	calltime = fgraph_retrieve_data(gops->idx, &size);
+	if (!calltime)
+		return;
+	trace->calltime = *calltime;
+
 	trace_ctx = tracing_gen_ctx_flags(flags);
 	__trace_graph_return(tr, trace, trace_ctx);
 	atomic_dec(&data->disabled);
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index d6c7f18daa15abbeb3cc368946aba76b000e8df8..c58292e424d5601d978cfa816d770b5204448ee4 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -118,6 +118,7 @@ static int wakeup_graph_entry(struct ftrace_graph_ent *trace,
 	struct trace_array *tr = wakeup_trace;
 	struct trace_array_cpu *data;
 	unsigned int trace_ctx;
+	u64 *calltime;
 	int ret = 0;
 
 	if (ftrace_graph_ignore_func(gops, trace))
@@ -135,6 +136,12 @@ static int wakeup_graph_entry(struct ftrace_graph_ent *trace,
 	if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
 		return 0;
 
+	calltime = fgraph_reserve_data(gops->idx, sizeof(*calltime));
+	if (!calltime)
+		return 0;
+
+	*calltime = trace_clock_local();
+
 	ret = __trace_graph_entry(tr, trace, trace_ctx);
 	atomic_dec(&data->disabled);
 	preempt_enable_notrace();
@@ -148,12 +155,19 @@ static void wakeup_graph_return(struct ftrace_graph_ret *trace,
 	struct trace_array *tr = wakeup_trace;
 	struct trace_array_cpu *data;
 	unsigned int trace_ctx;
+	u64 *calltime;
+	int size;
 
 	ftrace_graph_addr_finish(gops, trace);
 
 	if (!func_prolog_preempt_disable(tr, &data, &trace_ctx))
 		return;
 
+	calltime = fgraph_retrieve_data(gops->idx, &size);
+	if (!calltime)
+		return;
+	trace->calltime = *calltime;
+
 	__trace_graph_return(tr, trace, trace_ctx);
 	atomic_dec(&data->disabled);