tracing: Add DEFINE_EVENT(), DEFINE_SINGLE_EVENT() support to docbook

The introduction of the new 'DECLARE_EVENT_CLASS()' obviates the
need for the 'TRACE_EVENT()' macro in some cases. Thus, docbook
style comments that used to live with 'TRACE_EVENT()' are now
moved to 'DEFINE_EVENT()'. Thus, we need to make the docbook
system understand the new 'DEFINE_EVENT()' macro. In addition
I've tried to futureproof the patch, by also adding support for
'DEFINE_SINGLE_EVENT()', since there has been discussion about
renaming: TRACE_EVENT() -> DEFINE_SINGLE_EVENT().

Without this patch the tracepoint docbook fails to build.

I've verified that this patch correctly builds the tracepoint
docbook which currently covers signals, and irqs.

Changes in v2:
 - properly indent perl 'if' statements
Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: William Cohen <wcohen@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
LKML-Reference: <200912011718.nB1HIn7t011371@int-mx04.intmail.prod.int.phx2.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

scripts/kernel-doc

@@ -1852,10 +1852,17 @@ sub tracepoint_munge($) {
 	my $tracepointname = 0;
 	my $tracepointargs = 0;
 
-	if($prototype =~ m/TRACE_EVENT\((.*?),/) {
+	if ($prototype =~ m/TRACE_EVENT\((.*?),/) {
 		$tracepointname = $1;
 	}
-	if($prototype =~ m/TP_PROTO\((.*?)\)/) {
+	if ($prototype =~ m/DEFINE_SINGLE_EVENT\((.*?),/) {
+		$tracepointname = $1;
+	}
+	if ($prototype =~ m/DEFINE_EVENT\((.*?),(.*?),/) {
+		$tracepointname = $2;
+	}
+	$tracepointname =~ s/^\s+//; #strip leading whitespace
+	if ($prototype =~ m/TP_PROTO\((.*?)\)/) {
 		$tracepointargs = $1;
 	}
 	if (($tracepointname eq 0) || ($tracepointargs eq 0)) {
@@ -1920,7 +1927,9 @@ sub process_state3_function($$) {
 	if ($prototype =~ /SYSCALL_DEFINE/) {
 		syscall_munge();
 	}
-	if ($prototype =~ /TRACE_EVENT/) {
+	if ($prototype =~ /TRACE_EVENT/ || $prototype =~ /DEFINE_EVENT/ ||
+	    $prototype =~ /DEFINE_SINGLE_EVENT/)
+	{
 		tracepoint_munge($file);
 	}
 	dump_function($prototype, $file);