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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: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-10-15 23:55:16 +09:00 committed by Steven Rostedt (VMware)
parent efbbdaa22b
commit 1600cbcf69
1 changed files with 20 additions and 9 deletions
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27
include/trace/trace_events.h
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@ -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");
*
* return TRACE_TYPE_HANDLED;
* ------(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_handle_return(s);
* -------
* }
*
* This is the method used to print the raw event to the trace