Commit 1600cbcf authored by Masami Hiramatsu's avatar Masami Hiramatsu Committed by Steven Rostedt (VMware)
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tracing: Update the stage 3 of trace event macro comment 

Update the comment of the 3rd stage of trace event macro
expansion code. Now there are 2 macros makes different
trace_raw_output_<call>() functions.

Link: https://lkml.kernel.org/r/160277371605.29307.8586817119278606720.stgit@devnote2



Signed-off-by: default avatarMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent efbbdaa2

include/trace/trace_events.h

+20 −9
Original line number Diff line number Diff line
@@ -231,9 +231,11 @@ TRACE_MAKE_SYSTEM_STR(); 
 * {

 *	struct trace_seq *s = &iter->seq;

 *	struct trace_event_raw_<call> *field; <-- defined in stage 1

 *	struct trace_entry *entry;

 *	struct trace_seq *p = &iter->tmp_seq;

 *	int ret;

 *

 * -------(for event)-------

 *

 *	struct trace_entry *entry;

 *

 *	entry = iter->ent;

 *
@@ -245,13 +247,22 @@ TRACE_MAKE_SYSTEM_STR(); 
 *	field = (typeof(field))entry;

 *

 *	trace_seq_init(p);

 *	ret = trace_seq_printf(s, "%s: ", <call>);

 *	if (ret)

 *		ret = trace_seq_printf(s, <TP_printk> "\n");

 *	if (!ret)

 *		return TRACE_TYPE_PARTIAL_LINE;

 *	return trace_output_call(iter, <call>, <TP_printk> "\n");

 *

 * ------(or, for event class)------

 *

 *	int ret;

 *

 *	field = (typeof(field))iter->ent;

 *

 *	ret = trace_raw_output_prep(iter, trace_event);

 *	if (ret != TRACE_TYPE_HANDLED)

 *		return ret;

 *

 *	trace_event_printf(iter, <TP_printk> "\n");

 *

 *	return TRACE_TYPE_HANDLED;

 *	return trace_handle_return(s);

 * -------

 *  }

 *

 * This is the method used to print the raw event to the trace