try),
 	    NULL, NULL, NULL, NULL, UMA_ALIGNOF(struct rl_q_entry),
diff --git a/sys/kern/kern_rctl.c b/sys/kern/kern_rctl.c
index 4232c71f86fb..682ba86d23ff 100644
--- a/sys/kern/kern_rctl.c
+++ b/sys/kern/kern_rctl.c
@@ -209,7 +209,7 @@ static struct dict actionnames[] = {
 	{ "throttle", RCTL_ACTION_THROTTLE },
 	{ NULL, -1 }};
 
-static void rctl_init(void);
+static void rctl_init(void *);
 SYSINIT(rctl, SI_SUB_RACCT, SI_ORDER_FIRST, rctl_init, NULL);
 
 static uma_zone_t rctl_rule_zone;
@@ -2175,7 +2175,7 @@ rctl_racct_release(struct racct *racct)
 }
 
 static void
-rctl_init(void)
+rctl_init(void *dummy __unused)
 {
 
 	if (!racct_enable)
diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index 8efc0886988b..21f765b17f62 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -113,7 +113,7 @@ static int	filt_sigattach(struct knote *kn);
 static void	filt_sigdetach(struct knote *kn);
 static int	filt_signal(struct knote *kn, long hint);
 static struct thread *sigtd(struct proc *p, int sig, bool fast_sigblock);
-static void	sigqueue_start(void);
+static void	sigqueue_start(void *);
 static void	sigfastblock_setpend(struct thread *td, bool resched);
 static void	sig_handle_first_stop(struct thread *td, struct proc *p,
     int sig);
@@ -344,7 +344,7 @@ ast_sigsuspend(struct thread *td, int tda __unused)
 }
 
 static void
-sigqueue_start(void)
+sigqueue_start(void *dummy __unused)
 {
 	ksiginfo_zone = uma_zcreate("ksiginfo", sizeof(ksiginfo_t),
 		NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
diff --git a/sys/kern/kern_time.c b/sys/kern/kern_time.c
index 2a6f0989f6aa..5b7485c25cd7 100644
--- a/sys/kern/kern_time.c
+++ b/sys/kern/kern_time.c
@@ -90,7 +90,7 @@ static int	user_clock_nanosleep(struct thread *td, clockid_t clock_id,
 		    int flags, const struct timespec *ua_rqtp,
 		    struct timespec *ua_rmtp);
 
-static void	itimer_start(void);
+static void	itimer_start(void *);
 static int	itimer_init(void *, int, int);
 static void	itimer_fini(void *, int);
 static void	itimer_enter(struct itimer *);
@@ -1170,7 +1170,7 @@ eventratecheck(struct timeval *lasttime, int *cureps, int maxeps)
 }
 
 static void
-itimer_start(void)
+itimer_start(void *dummy __unused)
 {
 	static const struct kclock rt_clock = {
 		.timer_create  = realtimer_create,
diff --git a/sys/kern/subr_pcpu.c b/sys/kern/subr_pcpu.c
index 5c14e15830f4..c9a387a5e87b 100644
--- a/sys/kern/subr_pcpu.c
+++ b/sys/kern/subr_pcpu.c
@@ -140,7 +140,7 @@ uma_zone_t pcpu_zone_32;
 uma_zone_t pcpu_zone_64;
 
 static void
-pcpu_zones_startup(void)
+pcpu_zones_startup(void *dummy __unused)
 {
 
 	pcpu_zone_4 = uma_zcreate("pcpu-4", 4,
diff --git a/sys/kern/sys_socket.c b/sys/kern/sys_socket.c
index c221106ae067..bc0725230cca 100644
--- a/sys/kern/sys_socket.c
+++ b/sys/kern/sys_socket.c
@@ -586,7 +586,7 @@ soaio_enqueue(struct task *task)
 }
 
 static void
-soaio_init(void)
+soaio_init(void *dummy __unused)
 {
 
 	soaio_lifetime = AIOD_LIFETIME_DEFAULT;