tracing: update comments to match event code macros

Impact: clean up / comments

The comments that described the ftrace macros to manipulate the
TRACE_EVENT and TRACE_FORMAT macros no longer match the code.
This patch updates them.
Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>

kernel/trace/trace_events_stage_1.h

@@ -6,11 +6,13 @@
  * struct ftrace_raw_<call> {
  *	struct trace_entry		ent;
  *	<type>				<item>;
+ *	<type2>				<item2>[<len>];
  *	[...]
  * };
  *
- * The <type> <item> is created by the TRACE_FIELD(type, item, assign)
- * macro. We simply do "type item;", and that will create the fields
+ * The <type> <item> is created by the __field(type, item) macro or
+ * the __array(type2, item2, len) macro.
+ * We simply do "type item;", and that will create the fields
  * in the structure.
  */
 

kernel/trace/trace_events_stage_2.h

@@ -20,7 +20,7 @@
  *
  *	field = (typeof(field))entry;
  *
- *	ret = trace_seq_printf(s, <TP_RAW_FMT> "%s", <ARGS> "\n");
+ *	ret = trace_seq_printf(s, <TP_printk> "\n");
  *	if (!ret)
  *		return TRACE_TYPE_PARTIAL_LINE;
  *
@@ -76,10 +76,9 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags)	\
  *	int ret;
  *
  *	ret = trace_seq_printf(s, #type " " #item ";"
- *			       " size:%d; offset:%d;\n",
- *			       sizeof(field.type),
- *			       offsetof(struct ftrace_raw_##call,
- *					item));
+ *			       " offset:%u; size:%u;\n",
+ *			       offsetof(struct ftrace_raw_##call, item),
+ *			       sizeof(field.type));
  *
  * }
  */

kernel/trace/trace_events_stage_3.h

@@ -56,7 +56,8 @@
  * 		return;
  * 	entry	= ring_buffer_event_data(event);
  *
- * 	<tstruct>;  <-- Here we assign the entries by the TRACE_FIELD.
+ * 	<assign>;  <-- Here we assign the entries by the __field and
+ *			__array macros.
  *
  * 	trace_current_buffer_unlock_commit(event, irq_flags, pc);
  * }
@@ -96,11 +97,10 @@
  * __attribute__((__aligned__(4)))
  * __attribute__((section("_ftrace_events"))) event_<call> = {
  * 	.name 			= "<call>",
+ *	.system			= "<system>",
+ * 	.raw_init		= ftrace_raw_init_event_<call>,
  * 	.regfunc		= ftrace_reg_event_<call>,
  * 	.unregfunc		= ftrace_unreg_event_<call>,
- * 	.raw_init		= ftrace_raw_init_event_<call>,
- * 	.raw_reg		= ftrace_raw_reg_event_<call>,
- * 	.raw_unreg		= ftrace_raw_unreg_event_<call>,
  *	.show_format		= ftrace_format_<call>,
  * }
  *