5042 stop using deprecated atomic functions

@@ -2835,15 +2835,16 @@
         ASSERT(vnodeops != NULL);
 
         op = vp->v_op;
         membar_consumer();
         /*
-         * If vp->v_femhead == NULL, then we'll call casptr() to do the
-         * compare-and-swap on vp->v_op.  If either fails, then FEM is
+         * If vp->v_femhead == NULL, then we'll call atomic_cas_ptr() to do
+         * the compare-and-swap on vp->v_op.  If either fails, then FEM is
          * in effect on the vnode and we need to have FEM deal with it.
          */
-        if (vp->v_femhead != NULL || casptr(&vp->v_op, op, vnodeops) != op) {
+        if (vp->v_femhead != NULL || atomic_cas_ptr(&vp->v_op, op, vnodeops) !=
+            op) {
                 fem_setvnops(vp, vnodeops);
         }
 }
 
 /*