Index: kern/kern_stub.c
===================================================================
RCS file: /cvsroot/src/sys/kern/kern_stub.c,v
retrieving revision 1.47
diff -p -u -r1.47 kern_stub.c
--- kern/kern_stub.c	27 Jan 2019 02:55:26 -0000	1.47
+++ kern/kern_stub.c	7 Oct 2019 03:34:15 -0000
@@ -232,6 +232,8 @@ enodev(void)
 
 	return (ENODEV);
 }
+__strong_alias(devenodev,enodev);
+__strong_alias(ttyenodev,enodev);
 
 /*
  * Unconfigured device function; driver not configured.
@@ -275,6 +277,7 @@ eopnotsupp(void)
 
 	return (EOPNOTSUPP);
 }
+__strong_alias(deveopnotsupp,eopnotsupp);
 
 /*
  * Generic null operation, void return value.
@@ -283,6 +286,7 @@ void
 voidop(void)
 {
 }
+__strong_alias(ttyvenodev,voidop);
 
 /*
  * Generic null operation, always returns success.
Index: sys/conf.h
===================================================================
RCS file: /cvsroot/src/sys/sys/conf.h,v
retrieving revision 1.151
diff -p -u -r1.151 conf.h
--- sys/conf.h	17 Dec 2016 03:46:52 -0000	1.151
+++ sys/conf.h	7 Oct 2019 03:34:15 -0000
@@ -126,30 +126,35 @@ devmajor_t cdevsw_lookup_major(const str
 #define	dev_type_kqfilter(n)	int n (dev_t, struct knote *)
 #define dev_type_discard(n)	int n (dev_t, off_t, off_t)
 
-#define	noopen		((dev_type_open((*)))enodev)
-#define	noclose		((dev_type_close((*)))enodev)
-#define	noread		((dev_type_read((*)))enodev)
-#define	nowrite		((dev_type_write((*)))enodev)
-#define	noioctl		((dev_type_ioctl((*)))enodev)
-#define	nostop		((dev_type_stop((*)))enodev)
+int devenodev(dev_t, ...);
+int deveopnotsupp(dev_t, ...);
+int ttyenodev(struct tty *, ...);
+void ttyvenodev(struct tty *, ...);
+
+#define	noopen		((dev_type_open((*)))devenodev)
+#define	noclose		((dev_type_close((*)))devenodev)
+#define	noread		((dev_type_read((*)))devenodev)
+#define	nowrite		((dev_type_write((*)))devenodev)
+#define	noioctl		((dev_type_ioctl((*)))devenodev)
+#define	nostop		((dev_type_stop((*)))ttyvenodev)
 #define	notty		NULL
 #define	nopoll		seltrue
 paddr_t	nommap(dev_t, off_t, int);
-#define	nodump		((dev_type_dump((*)))enodev)
+#define	nodump		((dev_type_dump((*)))devenodev)
 #define	nosize		NULL
 #define	nokqfilter	seltrue_kqfilter
-#define nodiscard	((dev_type_discard((*)))enodev)
+#define nodiscard	((dev_type_discard((*)))devenodev)
 
-#define	nullopen	((dev_type_open((*)))nullop)
-#define	nullclose	((dev_type_close((*)))nullop)
-#define	nullread	((dev_type_read((*)))nullop)
-#define	nullwrite	((dev_type_write((*)))nullop)
-#define	nullioctl	((dev_type_ioctl((*)))nullop)
-#define	nullstop	((dev_type_stop((*)))nullop)
-#define	nullpoll	((dev_type_poll((*)))nullop)
-#define	nulldump	((dev_type_dump((*)))nullop)
-#define	nullkqfilter	((dev_type_kqfilter((*)))eopnotsupp)
-#define nulldiscard	((dev_type_discard((*)))nullop)
+#define	nullopen	((dev_type_open((*)))devenodev)
+#define	nullclose	((dev_type_close((*)))devenodev)
+#define	nullread	((dev_type_read((*)))devenodev)
+#define	nullwrite	((dev_type_write((*)))devenodev)
+#define	nullioctl	((dev_type_ioctl((*)))devenodev)
+#define	nullstop	((dev_type_stop((*)))ttyvenodev)
+#define	nullpoll	((dev_type_poll((*)))devenodev)
+#define	nulldump	((dev_type_dump((*)))devenodev)
+#define	nullkqfilter	((dev_type_kqfilter((*)))deveopnotsupp)
+#define nulldiscard	((dev_type_discard((*)))devenodev)
 
 /* device access wrappers. */
 
@@ -216,11 +221,10 @@ struct linesw *ttyldisc_default(void);
 void	       ttyldisc_release(struct linesw *);
 
 /* For those defining their own line disciplines: */
-#define	ttynodisc ((int (*)(dev_t, struct tty *))enodev)
-#define	ttyerrclose ((int (*)(struct tty *, int))enodev)
-#define	ttyerrio ((int (*)(struct tty *, struct uio *, int))enodev)
-#define	ttyerrinput ((int (*)(int, struct tty *))enodev)
-#define	ttyerrstart ((int (*)(struct tty *))enodev)
+#define	ttynodisc ((int (*)(dev_t, struct tty *))devenodev)
+#define	ttyerrclose ((int (*)(struct tty *, int))ttyenodev)
+#define	ttyerrio ((int (*)(struct tty *, struct uio *, int))ttyenodev)
+#define	ttyerrstart ((int (*)(struct tty *))ttyenodev)
 
 int	ttyerrpoll (struct tty *, int, struct lwp *);
 int	ttynullioctl(struct tty *, u_long, void *, int, struct lwp *);