fgraph: Add new fgraph_ops structure to enable function graph hooks

Currently the registering of function graph is to pass in a entry and return
function. We need to have a way to associate those functions together where
the entry can determine to run the return hook. Having a structure that
contains both functions will facilitate the process of converting the code
to be able to do such.

This is similar to the way function hooks are enabled (it passes in
ftrace_ops). Instead of passing in the functions to use, a single structure
is passed in to the registering function.

The unregister function is now passed in the fgraph_ops handle. When we
allow more than one callback to the function graph hooks, this will let the
system know which one to remove.

Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 16 insertions, 5 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 855c13c61e77..140b4b51ab34 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -345,17 +345,25 @@ static void trace_graph_thresh_return(struct ftrace_graph_ret *trace)
 		trace_graph_return(trace);
 }
 
+static struct fgraph_ops funcgraph_thresh_ops = {
+	.entryfunc = &trace_graph_entry,
+	.retfunc = &trace_graph_thresh_return,
+};
+
+static struct fgraph_ops funcgraph_ops = {
+	.entryfunc = &trace_graph_entry,
+	.retfunc = &trace_graph_return,
+};
+
 static int graph_trace_init(struct trace_array *tr)
 {
 	int ret;
 
 	set_graph_array(tr);
 	if (tracing_thresh)
-		ret = register_ftrace_graph(&trace_graph_thresh_return,
-					    &trace_graph_entry);
+		ret = register_ftrace_graph(&funcgraph_thresh_ops);
 	else
-		ret = register_ftrace_graph(&trace_graph_return,
-					    &trace_graph_entry);
+		ret = register_ftrace_graph(&funcgraph_ops);
 	if (ret)
 		return ret;
 	tracing_start_cmdline_record();
@@ -366,7 +374,10 @@ static int graph_trace_init(struct trace_array *tr)
 static void graph_trace_reset(struct trace_array *tr)
 {
 	tracing_stop_cmdline_record();
-	unregister_ftrace_graph();
+	if (tracing_thresh)
+		unregister_ftrace_graph(&funcgraph_thresh_ops);
+	else
+		unregister_ftrace_graph(&funcgraph_ops);
 }
 
 static int graph_trace_update_thresh(struct trace_array *tr)