diff --git a/sys/cam/scsi/scsi_target.c b/sys/cam/scsi/scsi_target.c
index de7e05cea61..b65ebecb8f9 100644
--- a/sys/cam/scsi/scsi_target.c
+++ b/sys/cam/scsi/scsi_target.c
@@ -113,7 +113,6 @@ static struct cdevsw targ_cdevsw = {
 	.d_poll =	targpoll,
 	.d_name =	"targ",
 	.d_maj =	TARG_CDEV_MAJOR,
-	.d_flags =	D_KQFILTER,
 	.d_kqfilter =	targkqfilter
 };
 
diff --git a/sys/dev/cy/cy.c b/sys/dev/cy/cy.c
index 53ea3bccd65..4e2e499da1a 100644
--- a/sys/dev/cy/cy.c
+++ b/sys/dev/cy/cy.c
@@ -405,7 +405,7 @@ static struct cdevsw sio_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	driver_name,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/dev/cy/cy_isa.c b/sys/dev/cy/cy_isa.c
index 53ea3bccd65..4e2e499da1a 100644
--- a/sys/dev/cy/cy_isa.c
+++ b/sys/dev/cy/cy_isa.c
@@ -405,7 +405,7 @@ static struct cdevsw sio_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	driver_name,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/dev/dgb/dgb.c b/sys/dev/dgb/dgb.c
index b702297f792..e77e2f1ca19 100644
--- a/sys/dev/dgb/dgb.c
+++ b/sys/dev/dgb/dgb.c
@@ -250,7 +250,7 @@ static struct cdevsw dgb_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"dgb",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/dev/digi/digi.c b/sys/dev/digi/digi.c
index 42c1b1ce4a6..22f1b2eb735 100644
--- a/sys/dev/digi/digi.c
+++ b/sys/dev/digi/digi.c
@@ -151,7 +151,7 @@ static struct cdevsw digi_sw = {
 	.d_poll =	ttypoll,
 	.d_name =	driver_name,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter
 };
 
diff --git a/sys/dev/rc/rc.c b/sys/dev/rc/rc.c
index eb023d8ba38..07c0c5b913c 100644
--- a/sys/dev/rc/rc.c
+++ b/sys/dev/rc/rc.c
@@ -154,7 +154,7 @@ static struct cdevsw rc_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"rc",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/dev/sab/sab.c b/sys/dev/sab/sab.c
index 56fd6ea7b80..362e8b72a35 100644
--- a/sys/dev/sab/sab.c
+++ b/sys/dev/sab/sab.c
@@ -168,7 +168,7 @@ static struct cdevsw sabtty_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"sabtty",
 	.d_maj =	MAJOR_AUTO,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/dev/si/si.c b/sys/dev/si/si.c
index ef37bfdd675..d96266ce069 100644
--- a/sys/dev/si/si.c
+++ b/sys/dev/si/si.c
@@ -124,7 +124,7 @@ static struct cdevsw si_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"si",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index 9f28b32199d..b3d8d21a78e 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -322,7 +322,7 @@ static struct cdevsw sio_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	sio_driver_name,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/dev/syscons/syscons.c b/sys/dev/syscons/syscons.c
index 1cf572b3251..b6b8e6b0f2e 100644
--- a/sys/dev/syscons/syscons.c
+++ b/sys/dev/syscons/syscons.c
@@ -221,7 +221,7 @@ static struct cdevsw sc_cdevsw = {
 	.d_mmap =	scmmap,
 	.d_name =	"sc",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter
 };
 
diff --git a/sys/dev/usb/ucom.c b/sys/dev/usb/ucom.c
index 5409913aaef..c25bc39e326 100644
--- a/sys/dev/usb/ucom.c
+++ b/sys/dev/usb/ucom.c
@@ -136,7 +136,7 @@ static struct cdevsw ucom_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"ucom",
 	.d_maj =	UCOM_CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 #if __FreeBSD_version < 500014
 	/* bmaj */	-1,
 #endif
diff --git a/sys/dev/zs/zs.c b/sys/dev/zs/zs.c
index 9ee3cdf3cf9..d901e10501f 100644
--- a/sys/dev/zs/zs.c
+++ b/sys/dev/zs/zs.c
@@ -158,7 +158,7 @@ static struct cdevsw zstty_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"zstty",
 	.d_maj =	MAJOR_AUTO,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/fs/specfs/spec_vnops.c b/sys/fs/specfs/spec_vnops.c
index f8c8a431dd5..4cbc308abdc 100644
--- a/sys/fs/specfs/spec_vnops.c
+++ b/sys/fs/specfs/spec_vnops.c
@@ -392,8 +392,6 @@ spec_kqfilter(ap)
 
 	dev = ap->a_vp->v_rdev;
 	dsw = devsw(dev);
-	if (!(dsw->d_flags & D_KQFILTER))
-		return (1);
 	if (dsw->d_flags & D_NOGIANT) {
 		DROP_GIANT();
 		error = dsw->d_kqfilter(dev, ap->a_kn);
diff --git a/sys/i386/isa/cx.c b/sys/i386/isa/cx.c
index 0892a0fbfc5..5f5f92e74e0 100644
--- a/sys/i386/isa/cx.c
+++ b/sys/i386/isa/cx.c
@@ -81,7 +81,7 @@ struct cdevsw cx_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"cx",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/i386/isa/cy.c b/sys/i386/isa/cy.c
index 53ea3bccd65..4e2e499da1a 100644
--- a/sys/i386/isa/cy.c
+++ b/sys/i386/isa/cy.c
@@ -405,7 +405,7 @@ static struct cdevsw sio_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	driver_name,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/i386/isa/istallion.c b/sys/i386/isa/istallion.c
index d9886873a43..9397d593e9c 100644
--- a/sys/i386/isa/istallion.c
+++ b/sys/i386/isa/istallion.c
@@ -650,7 +650,7 @@ static struct cdevsw stli_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	stli_drvname,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/i386/isa/pcvt/pcvt_drv.c b/sys/i386/isa/pcvt/pcvt_drv.c
index 55570ea5197..e795180d29d 100644
--- a/sys/i386/isa/pcvt/pcvt_drv.c
+++ b/sys/i386/isa/pcvt/pcvt_drv.c
@@ -105,7 +105,7 @@ static struct cdevsw vt_cdevsw = {
 	.d_mmap =	pcvt_mmap,
 	.d_name =	"vt",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/i386/isa/stallion.c b/sys/i386/isa/stallion.c
index ebf3534db4b..52185478ea3 100644
--- a/sys/i386/isa/stallion.c
+++ b/sys/i386/isa/stallion.c
@@ -544,7 +544,7 @@ static struct cdevsw stl_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"stl",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/kern/subr_xxx.c b/sys/kern/subr_xxx.c
index 85ec59b5256..448a8e26f02 100644
--- a/sys/kern/subr_xxx.c
+++ b/sys/kern/subr_xxx.c
@@ -128,7 +128,7 @@ nokqfilter(dev, kn)
 	struct knote *kn;
 {
 
-	return (ENODEV);
+	return (1);
 }
 
 int
diff --git a/sys/kern/tty_cons.c b/sys/kern/tty_cons.c
index e536b45287b..cd5c84f7d85 100644
--- a/sys/kern/tty_cons.c
+++ b/sys/kern/tty_cons.c
@@ -79,7 +79,7 @@ static struct cdevsw cn_cdevsw = {
 	.d_poll =	cnpoll,
 	.d_name =	"console",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	cnkqfilter,
 };
 
diff --git a/sys/kern/tty_pty.c b/sys/kern/tty_pty.c
index 1561eb1155b..d3ba47ab959 100644
--- a/sys/kern/tty_pty.c
+++ b/sys/kern/tty_pty.c
@@ -85,7 +85,7 @@ static struct cdevsw pts_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	"pts",
 	.d_maj =	CDEV_MAJOR_S,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
@@ -99,7 +99,7 @@ static struct cdevsw ptc_cdevsw = {
 	.d_poll =	ptcpoll,
 	.d_name =	"ptc",
 	.d_maj =	CDEV_MAJOR_C,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/net/if.c b/sys/net/if.c
index bad97806b46..3e91661a329 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -136,7 +136,6 @@ static struct cdevsw net_cdevsw = {
 	.d_ioctl =	netioctl,
 	.d_name =	"net",
 	.d_maj =	MAJOR_AUTO,
-	.d_flags =	D_KQFILTER,
 	.d_kqfilter =	netkqfilter,
 };
 
diff --git a/sys/pc98/cbus/sio.c b/sys/pc98/cbus/sio.c
index 3ec2bee6010..1dc212bbdc9 100644
--- a/sys/pc98/cbus/sio.c
+++ b/sys/pc98/cbus/sio.c
@@ -415,7 +415,7 @@ static struct cdevsw sio_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	sio_driver_name,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/pc98/pc98/sio.c b/sys/pc98/pc98/sio.c
index 3ec2bee6010..1dc212bbdc9 100644
--- a/sys/pc98/pc98/sio.c
+++ b/sys/pc98/pc98/sio.c
@@ -415,7 +415,7 @@ static struct cdevsw sio_cdevsw = {
 	.d_poll =	ttypoll,
 	.d_name =	sio_driver_name,
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter,
 };
 
diff --git a/sys/pc98/pc98/syscons.c b/sys/pc98/pc98/syscons.c
index 7220f705715..dcd90488ea3 100644
--- a/sys/pc98/pc98/syscons.c
+++ b/sys/pc98/pc98/syscons.c
@@ -221,7 +221,7 @@ static struct cdevsw sc_cdevsw = {
 	.d_mmap =	scmmap,
 	.d_name =	"sc",
 	.d_maj =	CDEV_MAJOR,
-	.d_flags =	D_TTY | D_KQFILTER,
+	.d_flags =	D_TTY,
 	.d_kqfilter =	ttykqfilter
 };
 
diff --git a/sys/sys/conf.h b/sys/sys/conf.h
index d0f2229c804..1bb71b38f5e 100644
--- a/sys/sys/conf.h
+++ b/sys/sys/conf.h
@@ -213,7 +213,6 @@ typedef int dumper_t(
 #define	D_NAGGED	0x00020000	/* nagged about missing make_dev() */
 #define	D_TRACKCLOSE	0x00080000	/* track all closes */
 #define D_MMAP_ANON	0x00100000	/* special treatment in vm_mmap.c */
-#define D_KQFILTER	0x00200000	/* has kqfilter entry */
 #define D_NOGIANT	0x00400000	/* Doesn't want Giant */
 
 /*
diff --git a/sys/sys/linedisc.h b/sys/sys/linedisc.h
index d0f2229c804..1bb71b38f5e 100644
--- a/sys/sys/linedisc.h
+++ b/sys/sys/linedisc.h
@@ -213,7 +213,6 @@ typedef int dumper_t(
 #define	D_NAGGED	0x00020000	/* nagged about missing make_dev() */
 #define	D_TRACKCLOSE	0x00080000	/* track all closes */
 #define D_MMAP_ANON	0x00100000	/* special treatment in vm_mmap.c */
-#define D_KQFILTER	0x00200000	/* has kqfilter entry */
 #define D_NOGIANT	0x00400000	/* Doesn't want Giant */
 
 /*