kerneldoc, tracing: make kernel-doc understand TRACE_EVENT() macro (take #2)

Add support to kernel-doc for tracepoint comments above TRACE_EVENT()
macro definitions. Paves the way for tracepoint docbook.

[ Impact: extend DocBook infrastructure ]

Signed-off-by: Jason Baron <jbaron@redhat.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: akpm@linux-foundation.org
Cc: rostedt@goodmis.org
Cc: fweisbec@gmail.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: wcohen@redhat.com
LKML-Reference: <d80706b6797e277924d2f3ec9af176c6b2951f88.1241107197.git.jbaron@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 0 deletions

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 0f11870116dc..2b53a55fbece 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1827,6 +1827,25 @@ sub reset_state {
     $state = 0;
 }
 
+sub tracepoint_munge($) {
+        my $file = shift;
+        my $tracepointname = 0;
+        my $tracepointargs = 0;
+
+        if($prototype =~ m/TRACE_EVENT\((.*?),/) {
+                $tracepointname = $1;
+        }
+        if($prototype =~ m/TP_PROTO\((.*?)\)/) {
+                $tracepointargs = $1;
+        }
+        if (($tracepointname eq 0) || ($tracepointargs eq 0)) {
+                print STDERR "Warning(${file}:$.): Unrecognized tracepoint format: \n".
+                             "$prototype\n";
+        } else {
+                $prototype = "static inline void trace_$tracepointname($tracepointargs)";
+        }
+}
+
 sub syscall_munge() {
         my $void = 0;
 
@@ -1881,6 +1900,9 @@ sub process_state3_function($$) {
         if ($prototype =~ /SYSCALL_DEFINE/) {
                 syscall_munge();
         }
+        if ($prototype =~ /TRACE_EVENT/) {
+                tracepoint_munge($file);
+        }
         dump_function($prototype, $file);
         reset_state();
     }