tracing: consolidate trace and trace_event headers

Impact: clean up

Neil Horman (et. al.) criticized the way the trace events were broken up
into two files. The reason for that was that ftrace needed to separate out
the declarations from where the #include <linux/tracepoint.h> was used.
It then dawned on me that the tracepoint.h header only needs to define the
TRACE_EVENT macro if it is not already defined.

The solution is simply to test if TRACE_EVENT is defined, and if it is not
then the linux/tracepoint.h header can define it. This change consolidates
all the <traces>.h and <traces>_event_types.h into the <traces>.h file.

Reported-by: Neil Horman <nhorman@tuxdriver.com>
Reported-by: Theodore Tso <tytso@mit.edu>
Reported-by: Jiaying Zhang <jiayingz@google.com>
Cc: Zhaolei <zhaolei@cn.fujitsu.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

kernel/trace/events.c

@@ -8,6 +8,7 @@
 
 #include "trace_output.h"
 
+#define TRACE_HEADER_MULTI_READ
 #include "trace_events_stage_1.h"
 #include "trace_events_stage_2.h"
 #include "trace_events_stage_3.h"

kernel/trace/trace_events_stage_1.h

@@ -1,7 +1,7 @@
 /*
  * Stage 1 of the trace events.
  *
- * Override the macros in <trace/trace_event_types.h> to include the following:
+ * Override the macros in <trace/trace_events.h> to include the following:
  *
  * struct ftrace_raw_<call> {
  *	struct trace_entry		ent;
@@ -36,4 +36,4 @@
 	};							\
 	static struct ftrace_event_call event_##name
 
-#include <trace/trace_event_types.h>
+#include <trace/trace_events.h>

kernel/trace/trace_events_stage_2.h

@@ -1,7 +1,7 @@
 /*
  * Stage 2 of the trace events.
  *
- * Override the macros in <trace/trace_event_types.h> to include the following:
+ * Override the macros in <trace/trace_events.h> to include the following:
  *
  * enum print_line_t
  * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
@@ -64,7 +64,7 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags)	\
 	return TRACE_TYPE_HANDLED;					\
 }
 	
-#include <trace/trace_event_types.h>
+#include <trace/trace_events.h>
 
 /*
  * Setup the showing format of trace point.
@@ -128,7 +128,7 @@ ftrace_format_##call(struct trace_seq *s)				\
 	return ret;							\
 }
 
-#include <trace/trace_event_types.h>
+#include <trace/trace_events.h>
 
 #undef __field
 #define __field(type, item)						\
@@ -167,4 +167,4 @@ ftrace_define_fields_##call(void)					\
 	return ret;							\
 }
 
-#include <trace/trace_event_types.h>
+#include <trace/trace_events.h>

kernel/trace/trace_events_stage_3.h

@@ -1,7 +1,7 @@
 /*
  * Stage 3 of the trace events.
  *
- * Override the macros in <trace/trace_event_types.h> to include the following:
+ * Override the macros in <trace/trace_events.h> to include the following:
  *
  * static void ftrace_event_<call>(proto)
  * {
@@ -272,7 +272,7 @@ __attribute__((section("_ftrace_events"))) event_##call = {		\
 	_TRACE_PROFILE_INIT(call)					\
 }
 
-#include <trace/trace_event_types.h>
+#include <trace/trace_events.h>
 
 #undef _TRACE_PROFILE
 #undef _TRACE_PROFILE_INIT