diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -2677,7 +2677,7 @@
 }
 
 bool
-pmap_is_valid_memattr(pmap_t pmap __unused, vm_memattr_t mode)
+pmap_is_valid_memattr(vm_memattr_t mode)
 {
 
 	return (mode >= 0 && mode < PAT_INDEX_SIZE &&
@@ -2693,7 +2693,7 @@
 {
 	int cache_bits, pat_flag, pat_idx;
 
-	if (!pmap_is_valid_memattr(pmap, mode))
+	if (!pmap_is_valid_memattr(mode))
 		panic("Unknown caching mode %d\n", mode);
 
 	switch (pmap->pm_type) {
diff --git a/sys/arm/arm/pmap-v6.c b/sys/arm/arm/pmap-v6.c
--- a/sys/arm/arm/pmap-v6.c
+++ b/sys/arm/arm/pmap-v6.c
@@ -398,7 +398,7 @@
 #define	VM_MEMATTR_END	(VM_MEMATTR_WRITE_THROUGH + 1)
 
 bool
-pmap_is_valid_memattr(pmap_t pmap __unused, vm_memattr_t mode)
+pmap_is_valid_memattr(vm_memattr_t mode)
 {
 
 	return (mode >= 0 && mode < VM_MEMATTR_END);
diff --git a/sys/arm64/arm64/pmap.c b/sys/arm64/arm64/pmap.c
--- a/sys/arm64/arm64/pmap.c
+++ b/sys/arm64/arm64/pmap.c
@@ -9009,7 +9009,7 @@
 }
 
 bool
-pmap_is_valid_memattr(pmap_t pmap __unused, vm_memattr_t mode)
+pmap_is_valid_memattr(vm_memattr_t mode)
 {
 
 	return (mode >= VM_MEMATTR_DEVICE && mode <= VM_MEMATTR_WRITE_THROUGH);
diff --git a/sys/dev/pci/pci_user.c b/sys/dev/pci/pci_user.c
--- a/sys/dev/pci/pci_user.c
+++ b/sys/dev/pci/pci_user.c
@@ -865,7 +865,7 @@
 	if ((pbm->pbm_flags & ~(PCIIO_BAR_MMAP_FIXED | PCIIO_BAR_MMAP_EXCL |
 	    PCIIO_BAR_MMAP_RW | PCIIO_BAR_MMAP_ACTIVATE)) != 0 ||
 	    pbm->pbm_memattr != (vm_memattr_t)pbm->pbm_memattr ||
-	    !pmap_is_valid_memattr(map->pmap, pbm->pbm_memattr))
+	    !pmap_is_valid_memattr(pbm->pbm_memattr))
 		return (EINVAL);
 
 	/* Fetch the BAR physical base and length. */
diff --git a/sys/i386/i386/pmap.c b/sys/i386/i386/pmap.c
--- a/sys/i386/i386/pmap.c
+++ b/sys/i386/i386/pmap.c
@@ -1080,7 +1080,7 @@
  ***************************************************/
 
 static bool
-__CONCAT(PMTYPE, is_valid_memattr)(pmap_t pmap __unused, vm_memattr_t mode)
+__CONCAT(PMTYPE, is_valid_memattr)(vm_memattr_t mode)
 {
 
 	return (mode >= 0 && mode < PAT_INDEX_SIZE &&
@@ -1096,7 +1096,7 @@
 {
 	int cache_bits, pat_flag, pat_idx;
 
-	if (!pmap_is_valid_memattr(pmap, mode))
+	if (!pmap_is_valid_memattr(mode))
 		panic("Unknown caching mode %d\n", mode);
 
 	/* The PAT bit is different for PTE's and PDE's. */
diff --git a/sys/i386/i386/pmap_base.c b/sys/i386/i386/pmap_base.c
--- a/sys/i386/i386/pmap_base.c
+++ b/sys/i386/i386/pmap_base.c
@@ -558,10 +558,10 @@
 }
 
 bool
-pmap_is_valid_memattr(pmap_t pmap, vm_memattr_t mode)
+pmap_is_valid_memattr(vm_memattr_t mode)
 {
 
-	return (pmap_methods_ptr->pm_is_valid_memattr(pmap, mode));
+	return (pmap_methods_ptr->pm_is_valid_memattr(mode));
 }
 
 int
diff --git a/sys/i386/include/pmap_base.h b/sys/i386/include/pmap_base.h
--- a/sys/i386/include/pmap_base.h
+++ b/sys/i386/include/pmap_base.h
@@ -58,7 +58,7 @@
 	void *(*pm_bios16_enter)(void);
 	void (*pm_bios16_leave)(void *handle);
 	void (*pm_bootstrap)(vm_paddr_t firstaddr);
-	bool (*pm_is_valid_memattr)(pmap_t, vm_memattr_t);
+	bool (*pm_is_valid_memattr)(vm_memattr_t);
 	int (*pm_cache_bits)(pmap_t, int, bool);
 	bool (*pm_ps_enabled)(pmap_t);
 	void (*pm_pinit0)(pmap_t);
diff --git a/sys/powerpc/powerpc/pmap_dispatch.c b/sys/powerpc/powerpc/pmap_dispatch.c
--- a/sys/powerpc/powerpc/pmap_dispatch.c
+++ b/sys/powerpc/powerpc/pmap_dispatch.c
@@ -237,7 +237,7 @@
 int unmapped_buf_allowed;
 
 bool
-pmap_is_valid_memattr(pmap_t pmap __unused, vm_memattr_t mode)
+pmap_is_valid_memattr(vm_memattr_t mode)
 {
 
 	switch (mode) {
diff --git a/sys/riscv/riscv/pmap.c b/sys/riscv/riscv/pmap.c
--- a/sys/riscv/riscv/pmap.c
+++ b/sys/riscv/riscv/pmap.c
@@ -4886,7 +4886,7 @@
 }
 
 bool
-pmap_is_valid_memattr(pmap_t pmap __unused, vm_memattr_t mode)
+pmap_is_valid_memattr(vm_memattr_t mode)
 {
 
 	return (mode >= VM_MEMATTR_DEVICE && mode <= VM_MEMATTR_WRITE_BACK);
diff --git a/sys/vm/pmap.h b/sys/vm/pmap.h
--- a/sys/vm/pmap.h
+++ b/sys/vm/pmap.h
@@ -141,7 +141,7 @@
 bool		 pmap_is_modified(vm_page_t m);
 bool		 pmap_is_prefaultable(pmap_t pmap, vm_offset_t va);
 bool		 pmap_is_referenced(vm_page_t m);
-bool		 pmap_is_valid_memattr(pmap_t, vm_memattr_t);
+bool		 pmap_is_valid_memattr(vm_memattr_t);
 vm_offset_t	 pmap_map(vm_offset_t *, vm_paddr_t, vm_paddr_t, int);
 int		 pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *pap);
 void		 pmap_object_init_pt(pmap_t pmap, vm_offset_t addr,