--- xinu/sys/mark.c	2018/04/24 17:39:02	1.1
+++ xinu/sys/mark.c	2018/04/24 17:39:23	1.1.1.2
@@ -4,6 +4,7 @@
 #include <kernel.h>
 #include <mark.h>
 
+
 #ifdef	MEMMARK
 int	*marks[MAXMARK];
 int	nmarks;
@@ -15,6 +16,9 @@ int	mkmutex;
  */
 _mkinit()
 {
+#ifdef	DEBUG
+	dotrace("_mkinit", NULL, 0);
+#endif
 	mkmutex = screate(1);
 	nmarks = 0;
 }
@@ -25,9 +29,13 @@ _mkinit()
  *  mark  --  mark a location if it hasn't been marked
  *------------------------------------------------------------------------
  */
-SYSCALL	mark(loc)
-int	*loc;
+mark(loc)
+int *loc;
 {
+
+#ifdef	DEBUG
+	dotrace("mark", &loc, 1);
+#endif
 	if ( *loc>=0 && *loc<nmarks && marks[*loc]==loc )
 		return(0);
 	if (nmarks>=MAXMARK)