tracing: Allow events to share their print functions

Multiple events may use the same method to print their data.
Instead of having all events have a pointer to their print funtions,
the trace_event structure now points to a trace_event_functions structure
that will hold the way to print ouf the event.

The event itself is now passed to the print function to let the print
function know what kind of event it should print.

This opens the door to consolidating the way several events print
their output.

   text	   data	    bss	    dec	    hex	filename
4913961	1088356	 861512	6863829	 68bbd5	vmlinux.orig
4900382	1048964	 861512	6810858	 67ecea	vmlinux.init
4900446	1049028	 861512	6810986	 67ed6a	vmlinux.preprint

This change slightly increases the size but is needed for the next change.

v3: Fix the branch tracer events to handle this change.

v2: Fix the new function graph tracer event calls to handle this change.

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 9 insertions, 4 deletions

diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index dd11c830eb84..79f4bac99a94 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1025,7 +1025,7 @@ print_graph_comment(struct trace_seq *s, struct trace_entry *ent,
                 if (!event)
                         return TRACE_TYPE_UNHANDLED;
 
-                ret = event->trace(iter, sym_flags);
+                ret = event->funcs->trace(iter, sym_flags, event);
                 if (ret != TRACE_TYPE_HANDLED)
                         return ret;
         }
@@ -1112,7 +1112,8 @@ print_graph_function(struct trace_iterator *iter)
 }
 
 static enum print_line_t
-print_graph_function_event(struct trace_iterator *iter, int flags)
+print_graph_function_event(struct trace_iterator *iter, int flags,
+                           struct trace_event *event)
 {
         return print_graph_function(iter);
 }
@@ -1225,14 +1226,18 @@ void graph_trace_close(struct trace_iterator *iter)
         }
 }
 
+static struct trace_event_functions graph_functions = {
+        .trace          = print_graph_function_event,
+};
+
 static struct trace_event graph_trace_entry_event = {
         .type           = TRACE_GRAPH_ENT,
-        .trace          = print_graph_function_event,
+        .funcs          = &graph_functions,
 };
 
 static struct trace_event graph_trace_ret_event = {
         .type           = TRACE_GRAPH_RET,
-        .trace          = print_graph_function_event,
+        .funcs          = &graph_functions
 };
 
 static struct tracer graph_trace __read_mostly = {