Index: if.c
===================================================================
RCS file: /cvs/src/sys/net/if.c,v
retrieving revision 1.612
diff -u -p -r1.612 if.c
--- if.c	10 Jul 2020 13:23:34 -0000	1.612
+++ if.c	16 Jul 2020 04:22:07 -0000
@@ -520,16 +520,6 @@ if_attachdomain(struct ifnet *ifp)
 }
 
 void
-if_attachhead(struct ifnet *ifp)
-{
-	if_attach_common(ifp);
-	NET_LOCK();
-	TAILQ_INSERT_HEAD(&ifnet, ifp, if_list);
-	if_attachsetup(ifp);
-	NET_UNLOCK();
-}
-
-void
 if_attach(struct ifnet *ifp)
 {
 	if_attach_common(ifp);
Index: if.h
===================================================================
RCS file: /cvs/src/sys/net/if.h,v
retrieving revision 1.203
diff -u -p -r1.203 if.h
--- if.h	25 Jul 2019 15:23:39 -0000	1.203
+++ if.h	16 Jul 2020 04:22:07 -0000
@@ -530,8 +530,6 @@ void	if_attach(struct ifnet *);
 void	if_attach_queues(struct ifnet *, unsigned int);
 void	if_attach_iqueues(struct ifnet *, unsigned int);
 void	if_attach_ifq(struct ifnet *, const struct ifq_ops *, void *);
-void	if_attachtail(struct ifnet *);
-void	if_attachhead(struct ifnet *);
 void	if_deactivate(struct ifnet *);
 void	if_detach(struct ifnet *);
 void	if_down(struct ifnet *);
Index: if_loop.c
===================================================================
RCS file: /cvs/src/sys/net/if_loop.c,v
retrieving revision 1.90
diff -u -p -r1.90 if_loop.c
--- if_loop.c	8 Jan 2020 09:09:10 -0000	1.90
+++ if_loop.c	16 Jul 2020 04:22:07 -0000
@@ -178,12 +178,11 @@ loop_clone_create(struct if_clone *ifc, 
 	ifp->if_output = looutput;
 	ifp->if_type = IFT_LOOP;
 	ifp->if_hdrlen = sizeof(u_int32_t);
+	if_attach(ifp);
 	if (unit == 0) {
-		if_attachhead(ifp);
 		if_addgroup(ifp, ifc->ifc_name);
 		rtable_l2set(0, 0, ifp->if_index);
-	} else
-		if_attach(ifp);
+	}
 	if_alloc_sadl(ifp);
 #if NBPFILTER > 0
 	bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t));