diff --git a/sys/cddl/dev/dtmalloc/dtmalloc.c b/sys/cddl/dev/dtmalloc/dtmalloc.c
index 3f584dc0860..ae21054315d 100644
--- a/sys/cddl/dev/dtmalloc/dtmalloc.c
+++ b/sys/cddl/dev/dtmalloc/dtmalloc.c
@@ -39,7 +39,6 @@
 extern bool dtrace_malloc_enabled;
 static uint32_t dtrace_malloc_enabled_count;
 
-static d_open_t	dtmalloc_open;
 static int	dtmalloc_unload(void);
 static void	dtmalloc_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *);
 static void	dtmalloc_provide(void *, dtrace_probedesc_t *);
@@ -48,12 +47,6 @@ static void	dtmalloc_enable(void *, dtrace_id_t, void *);
 static void	dtmalloc_disable(void *, dtrace_id_t, void *);
 static void	dtmalloc_load(void *);
 
-static struct cdevsw dtmalloc_cdevsw = {
-	.d_version	= D_VERSION,
-	.d_open		= dtmalloc_open,
-	.d_name		= "dtmalloc",
-};
-
 static dtrace_pattr_t dtmalloc_attr = {
 { DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
@@ -75,7 +68,6 @@ static dtrace_pops_t dtmalloc_pops = {
 	.dtps_destroy =		dtmalloc_destroy
 };
 
-static struct cdev		*dtmalloc_cdev;
 static dtrace_provider_id_t	dtmalloc_id;
 
 static void
@@ -173,10 +165,6 @@ dtmalloc_disable(void *arg, dtrace_id_t id, void *parg)
 static void
 dtmalloc_load(void *dummy)
 {
-	/* Create the /dev/dtrace/dtmalloc entry. */
-	dtmalloc_cdev = make_dev(&dtmalloc_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
-	    "dtrace/dtmalloc");
-
 	if (dtrace_register("dtmalloc", &dtmalloc_attr, DTRACE_PRIV_USER,
 	    NULL, &dtmalloc_pops, NULL, &dtmalloc_id) != 0)
 		return;
@@ -195,8 +183,6 @@ dtmalloc_unload()
 	if ((error = dtrace_unregister(dtmalloc_id)) != 0)
 		return (error);
 
-	destroy_dev(dtmalloc_cdev);
-
 	return (error);
 }
 
@@ -224,12 +210,6 @@ dtmalloc_modevent(module_t mod __unused, int type, void *data __unused)
 	return (error);
 }
 
-static int
-dtmalloc_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
-{
-	return (0);
-}
-
 SYSINIT(dtmalloc_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, dtmalloc_load, NULL);
 SYSUNINIT(dtmalloc_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, dtmalloc_unload, NULL);
 
diff --git a/sys/cddl/dev/fbt/fbt.c b/sys/cddl/dev/fbt/fbt.c
index aee5376d598..1ee7d121f60 100644
--- a/sys/cddl/dev/fbt/fbt.c
+++ b/sys/cddl/dev/fbt/fbt.c
@@ -70,7 +70,6 @@ dtrace_provider_id_t	fbt_id;
 fbt_probe_t		**fbt_probetab;
 int			fbt_probetab_mask;
 
-static d_open_t	fbt_open;
 static int	fbt_unload(void);
 static void	fbt_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *);
 static void	fbt_provide_module(void *, modctl_t *);
@@ -81,12 +80,6 @@ static void	fbt_load(void *);
 static void	fbt_suspend(void *, dtrace_id_t, void *);
 static void	fbt_resume(void *, dtrace_id_t, void *);
 
-static struct cdevsw fbt_cdevsw = {
-	.d_version	= D_VERSION,
-	.d_open		= fbt_open,
-	.d_name		= "fbt",
-};
-
 static dtrace_pattr_t fbt_attr = {
 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
@@ -108,7 +101,6 @@ static dtrace_pops_t fbt_pops = {
 	.dtps_destroy =		fbt_destroy
 };
 
-static struct cdev		*fbt_cdev;
 static int			fbt_probetab_size;
 static int			fbt_verbose = 0;
 
@@ -1255,10 +1247,6 @@ fbt_linker_file_cb(linker_file_t lf, void *arg)
 static void
 fbt_load(void *dummy)
 {
-	/* Create the /dev/dtrace/fbt entry. */
-	fbt_cdev = make_dev(&fbt_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
-	    "dtrace/fbt");
-
 	/* Default the probe table size if not specified. */
 	if (fbt_probetab_size == 0)
 		fbt_probetab_size = FBT_PROBETAB_SIZE;
@@ -1300,8 +1288,6 @@ fbt_unload()
 	fbt_probetab = NULL;
 	fbt_probetab_mask = 0;
 
-	destroy_dev(fbt_cdev);
-
 	return (error);
 }
 
@@ -1329,12 +1315,6 @@ fbt_modevent(module_t mod __unused, int type, void *data __unused)
 	return (error);
 }
 
-static int
-fbt_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
-{
-	return (0);
-}
-
 SYSINIT(fbt_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, fbt_load, NULL);
 SYSUNINIT(fbt_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, fbt_unload, NULL);
 
diff --git a/sys/cddl/dev/profile/profile.c b/sys/cddl/dev/profile/profile.c
index 1e7a84c272c..87289ff2717 100644
--- a/sys/cddl/dev/profile/profile.c
+++ b/sys/cddl/dev/profile/profile.c
@@ -155,7 +155,6 @@ typedef struct profile_probe_percpu {
 #endif
 } profile_probe_percpu_t;
 
-static d_open_t	profile_open;
 static int	profile_unload(void);
 static void	profile_create(hrtime_t, char *, int);
 static void	profile_destroy(void *, dtrace_id_t, void *);
@@ -189,12 +188,6 @@ static uint32_t profile_max = PROFILE_MAX_DEFAULT;
 					/* maximum number of profile probes */
 static uint32_t profile_total;		/* current number of profile probes */
 
-static struct cdevsw profile_cdevsw = {
-	.d_version	= D_VERSION,
-	.d_open		= profile_open,
-	.d_name		= "profile",
-};
-
 static dtrace_pattr_t profile_attr = {
 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
@@ -216,7 +209,6 @@ static dtrace_pops_t profile_pops = {
 	.dtps_destroy =		profile_destroy
 };
 
-static struct cdev		*profile_cdev;
 static dtrace_provider_id_t	profile_id;
 static hrtime_t			profile_interval_min = NANOSEC / 5000;	/* 5000 hz */
 static int			profile_aframes = PROF_ARTIFICIAL_FRAMES;
@@ -638,10 +630,6 @@ profile_disable(void *arg, dtrace_id_t id, void *parg)
 static void
 profile_load(void *dummy)
 {
-	/* Create the /dev/dtrace/profile entry. */
-	profile_cdev = make_dev(&profile_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
-	    "dtrace/profile");
-
 	if (dtrace_register("profile", &profile_attr, DTRACE_PRIV_USER,
 	    NULL, &profile_pops, NULL, &profile_id) != 0)
 		return;
@@ -656,8 +644,6 @@ profile_unload()
 	if ((error = dtrace_unregister(profile_id)) != 0)
 		return (error);
 
-	destroy_dev(profile_cdev);
-
 	return (error);
 }
 
@@ -685,13 +671,6 @@ profile_modevent(module_t mod __unused, int type, void *data __unused)
 	return (error);
 }
 
-/* ARGSUSED */
-static int
-profile_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
-{
-	return (0);
-}
-
 SYSINIT(profile_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_load, NULL);
 SYSUNINIT(profile_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, profile_unload, NULL);
 
diff --git a/sys/cddl/dev/prototype.c b/sys/cddl/dev/prototype.c
index 6e31f19d5ce..bcbb3d202b2 100644
--- a/sys/cddl/dev/prototype.c
+++ b/sys/cddl/dev/prototype.c
@@ -82,7 +82,10 @@ prototype_disable(void *arg, dtrace_id_t id, void *parg)
 static void
 prototype_load(void *dummy)
 {
-	/* Create the /dev/dtrace/prototype entry. */
+	/*
+	 * Create the /dev/dtrace/prototype entry.
+	 * XXX: Remove this if the provider does not need any customs ioctls.
+	 */
 	prototype_cdev = make_dev(&prototype_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
 	    "dtrace/prototype");