From: Steven Rostedt <srostedt@redhat.com>
Date: Tue, 24 Mar 2009 03:38:49 +0000 (-0400)
Subject: function-graph: moved the timestamp from arch to generic code
X-Git-Tag: firefly_0821_release~13991^2~206
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5d1a03dc541dc6672e60e57249ed22f40654ca47;p=firefly-linux-kernel-4.4.55.git

function-graph: moved the timestamp from arch to generic code

This patch move the timestamp from happening in the arch specific
code into the general code. This allows for better control by the tracer
to time manipulation.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
---

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 57b33edb7ce3..61df77532120 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -410,7 +410,6 @@ int ftrace_disable_ftrace_graph_caller(void)
 void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
 {
 	unsigned long old;
-	unsigned long long calltime;
 	int faulted;
 	struct ftrace_graph_ent trace;
 	unsigned long return_hooker = (unsigned long)
@@ -453,10 +452,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
 		return;
 	}
 
-	calltime = trace_clock_local();
-
-	if (ftrace_push_return_trace(old, calltime,
-				self_addr, &trace.depth) == -EBUSY) {
+	if (ftrace_push_return_trace(old, self_addr, &trace.depth) == -EBUSY) {
 		*parent = old;
 		return;
 	}
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index db3fed630db3..1141248c84ee 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -369,8 +369,7 @@ struct ftrace_ret_stack {
 extern void return_to_handler(void);
 
 extern int
-ftrace_push_return_trace(unsigned long ret, unsigned long long time,
-			 unsigned long func, int *depth);
+ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth);
 extern void
 ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret);
 
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index e876816fa8e7..d28687e7b3a7 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -57,9 +57,9 @@ static struct tracer_flags tracer_flags = {
 
 /* Add a function return address to the trace stack on thread info.*/
 int
-ftrace_push_return_trace(unsigned long ret, unsigned long long time,
-			 unsigned long func, int *depth)
+ftrace_push_return_trace(unsigned long ret, unsigned long func, int *depth)
 {
+	unsigned long long calltime;
 	int index;
 
 	if (!current->ret_stack)
@@ -71,11 +71,13 @@ ftrace_push_return_trace(unsigned long ret, unsigned long long time,
 		return -EBUSY;
 	}
 
+	calltime = trace_clock_local();
+
 	index = ++current->curr_ret_stack;
 	barrier();
 	current->ret_stack[index].ret = ret;
 	current->ret_stack[index].func = func;
-	current->ret_stack[index].calltime = time;
+	current->ret_stack[index].calltime = calltime;
 	*depth = index;
 
 	return 0;