diff --git a/sys/vm/vm.h b/sys/vm/vm.h
--- a/sys/vm/vm.h
+++ b/sys/vm/vm.h
@@ -154,6 +154,12 @@
 #define	SWAP_RESERVE_RLIMIT_ON		(1 << 1)
 #define	SWAP_RESERVE_ALLOW_NONWIRED	(1 << 2)
 
+#ifdef NUMA
+#define	__numa_used
+#else
+#define	__numa_used	__unused
+#endif
+
 #ifdef _KERNEL
 struct ucred;
 
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
--- a/sys/vm/vm_page.h
+++ b/sys/vm/vm_page.h
@@ -1005,7 +1005,7 @@
 }
 
 static inline int
-vm_page_domain(vm_page_t m)
+vm_page_domain(vm_page_t m __numa_used)
 {
 #ifdef NUMA
 	int domn, segind;
diff --git a/sys/vm/vm_phys.h b/sys/vm/vm_phys.h
--- a/sys/vm/vm_phys.h
+++ b/sys/vm/vm_phys.h
@@ -89,7 +89,7 @@
 bool vm_phys_is_dumpable(vm_paddr_t pa);
 
 static inline int
-vm_phys_domain(vm_paddr_t pa)
+vm_phys_domain(vm_paddr_t pa __numa_used)
 {
 #ifdef NUMA
 	int i;
diff --git a/sys/vm/vm_phys.c b/sys/vm/vm_phys.c
--- a/sys/vm/vm_phys.c
+++ b/sys/vm/vm_phys.c
@@ -226,7 +226,8 @@
 }
 
 int
-vm_phys_domain_match(int prefer, vm_paddr_t low, vm_paddr_t high)
+vm_phys_domain_match(int prefer __numa_used, vm_paddr_t low __numa_used,
+    vm_paddr_t high __numa_used)
 {
 #ifdef NUMA
 	domainset_t mask;
@@ -330,7 +331,7 @@
  * Return affinity, or -1 if there's no affinity information.
  */
 int
-vm_phys_mem_affinity(int f, int t)
+vm_phys_mem_affinity(int f __numa_used, int t __numa_used)
 {
 
 #ifdef NUMA
@@ -629,8 +630,8 @@
  * Invoked by platform-dependent code prior to vm_phys_init().
  */
 void
-vm_phys_register_domains(int ndomains, struct mem_affinity *affinity,
-    int *locality)
+vm_phys_register_domains(int ndomains __numa_used,
+    struct mem_affinity *affinity __numa_used, int *locality __numa_used)
 {
 #ifdef NUMA
 	int i;
@@ -651,10 +652,6 @@
 
 	for (i = 0; i < vm_ndomains; i++)
 		DOMAINSET_SET(i, &all_domains);
-#else
-	(void)ndomains;
-	(void)affinity;
-	(void)locality;
 #endif
 }