diff --git a/sys/compat/linuxkpi/common/include/linux/io.h b/sys/compat/linuxkpi/common/include/linux/io.h
--- a/sys/compat/linuxkpi/common/include/linux/io.h
+++ b/sys/compat/linuxkpi/common/include/linux/io.h
@@ -32,7 +32,8 @@
 #include <sys/endian.h>
 #include <sys/types.h>
 
-#include <machine/vm.h>
+#include <vm/vm.h>
+#include <vm/vm_phys.h>
 
 #include <linux/compiler.h>
 #include <linux/err.h>
@@ -541,30 +542,23 @@
 #define	arch_phys_wc_index(x)	\
 	(((x) < __MTRR_ID_BASE) ? -1 : ((x) - __MTRR_ID_BASE))
 
-#if defined(__amd64__) || defined(__i386__) || defined(__aarch64__) || defined(__powerpc__) || defined(__riscv)
 static inline int
 arch_io_reserve_memtype_wc(resource_size_t start, resource_size_t size)
 {
-	vm_offset_t va;
-
-	va = PHYS_TO_DMAP(start);
-
-#ifdef VM_MEMATTR_WRITE_COMBINING
-	return (-pmap_change_attr(va, size, VM_MEMATTR_WRITE_COMBINING));
+#if defined(__amd64__) || defined(__i386__)
+	return (-vm_phys_fictitious_reg_range(start, start + size,
+	    VM_MEMATTR_WRITE_COMBINING));
 #else
-	return (-pmap_change_attr(va, size, VM_MEMATTR_UNCACHEABLE));
+	return (0);
 #endif
 }
 
 static inline void
 arch_io_free_memtype_wc(resource_size_t start, resource_size_t size)
 {
-	vm_offset_t va;
-
-	va = PHYS_TO_DMAP(start);
-
-	pmap_change_attr(va, size, VM_MEMATTR_WRITE_BACK);
-}
+#if defined(__amd64__) || defined(__i386__)
+	vm_phys_fictitious_unreg_range(start, start + size);
 #endif
+}
 
 #endif	/* _LINUXKPI_LINUX_IO_H_ */
diff --git a/sys/sys/param.h b/sys/sys/param.h
--- a/sys/sys/param.h
+++ b/sys/sys/param.h
@@ -73,7 +73,7 @@
  * cannot include sys/param.h and should only be updated here.
  */
 #undef __FreeBSD_version
-#define __FreeBSD_version 1500018
+#define __FreeBSD_version 1500019
 
 /*
  * __FreeBSD_kernel__ indicates that this system uses the kernel of FreeBSD,
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
@@ -34,6 +34,8 @@
 #ifndef	__VM_PHYS_H_
 #define	__VM_PHYS_H_
 
+#include <sys/queue.h>
+
 #include <machine/vmparam.h>
 
 #ifndef VM_NFREEORDER_MAX
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
@@ -40,6 +40,8 @@
 
 #ifdef _KERNEL
 
+#include <sys/param.h>		/* For NULL */
+
 #include <vm/_vm_phys.h>
 
 extern vm_paddr_t phys_avail[];