kernel-doc: restrict syntax for private: and public:

scripts/kernel-doc can (incorrectly) delete struct members that are
surrounded by /* ...  */ <struct members> /* ...  */ if there is a /*
private: */ comment in there somewhere also.

Fix that by making the "/* private:" only allow whitespace between /* and
"private:", not anything/everything in the world.

This fixes some erroneous kernel-doc warnings that popped up while
processing include/linux/usb/composite.h.
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/kernel-doc-nano-HOWTO.txt

@@ -269,7 +269,10 @@ Use the argument mechanism to document members or constants.
 
 Inside a struct description, you can use the "private:" and "public:"
 comment tags.  Structure fields that are inside a "private:" area
-are not listed in the generated output documentation.
+are not listed in the generated output documentation.  The "private:"
+and "public:" tags must begin immediately following a "/*" comment
+marker.  They may optionally include comments between the ":" and the
+ending "*/" marker.
 
 Example:
 
@@ -283,7 +286,7 @@ Example:
 struct my_struct {
     int a;
     int b;
-/* private: */
+/* private: internal use only */
     int c;
 };
 

scripts/kernel-doc

@@ -1411,7 +1411,8 @@ sub dump_struct($$) {
     my $file = shift;
     my $nested;
 
-    if ($x =~/(struct|union)\s+(\w+)\s*{(.*)}/) {
+    if ($x =~ /(struct|union)\s+(\w+)\s*{(.*)}/) {
+	#my $decl_type = $1;
 	$declaration_name = $2;
 	my $members = $3;
 
@@ -1420,8 +1421,8 @@ sub dump_struct($$) {
 	$nested = $1;
 
 	# ignore members marked private:
-	$members =~ s/\/\*.*?private:.*?public:.*?\*\///gos;
-	$members =~ s/\/\*.*?private:.*//gos;
+	$members =~ s/\/\*\s*private:.*?\/\*\s*public:.*?\*\///gos;
+	$members =~ s/\/\*\s*private:.*//gos;
 	# strip comments:
 	$members =~ s/\/\*.*?\*\///gos;
 	$nested =~ s/\/\*.*?\*\///gos;