diff --git a/sys/amd64/include/vm.h b/sys/amd64/include/vm.h
--- a/sys/amd64/include/vm.h
+++ b/sys/amd64/include/vm.h
@@ -43,5 +43,6 @@
 #define	VM_MEMATTR_WEAK_UNCACHEABLE	((vm_memattr_t)PAT_UNCACHED)
 
 #define	VM_MEMATTR_DEFAULT		VM_MEMATTR_WRITE_BACK
+#define	VM_MEMATTR_DEVICE		VM_MEMATTR_UNCACHEABLE
 
 #endif /* !_MACHINE_VM_H_ */
diff --git a/sys/i386/include/vm.h b/sys/i386/include/vm.h
--- a/sys/i386/include/vm.h
+++ b/sys/i386/include/vm.h
@@ -43,5 +43,6 @@
 #define	VM_MEMATTR_WEAK_UNCACHEABLE	((vm_memattr_t)PAT_UNCACHED)
 
 #define	VM_MEMATTR_DEFAULT		VM_MEMATTR_WRITE_BACK
+#define	VM_MEMATTR_DEVICE		VM_MEMATTR_UNCACHEABLE
 
 #endif /* !_MACHINE_VM_H_ */
diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -3155,7 +3155,7 @@
 {
 	bzero(args, sz);
 	args->size = sz;
-	args->memattr = VM_MEMATTR_UNCACHEABLE;
+	args->memattr = VM_MEMATTR_DEVICE;
 }
 
 /**
diff --git a/sys/mips/include/vm.h b/sys/mips/include/vm.h
--- a/sys/mips/include/vm.h
+++ b/sys/mips/include/vm.h
@@ -38,6 +38,7 @@
 #define	VM_MEMATTR_UNCACHEABLE		((vm_memattr_t)MIPS_CCA_UNCACHED)
 #define	VM_MEMATTR_WRITE_BACK		((vm_memattr_t)MIPS_CCA_CACHED)
 #define	VM_MEMATTR_DEFAULT		VM_MEMATTR_WRITE_BACK
+#define	VM_MEMATTR_DEVICE		VM_MEMATTR_UNCACHEABLE
 #ifdef MIPS_CCA_WC
 #define	VM_MEMATTR_WRITE_COMBINING	((vm_memattr_t)MIPS_CCA_WC)
 #endif
diff --git a/sys/powerpc/include/vm.h b/sys/powerpc/include/vm.h
--- a/sys/powerpc/include/vm.h
+++ b/sys/powerpc/include/vm.h
@@ -42,4 +42,6 @@
 #define	VM_MEMATTR_WRITE_THROUGH	0x10
 #define	VM_MEMATTR_PREFETCHABLE		0x20
 
+#define	VM_MEMATTR_DEVICE		VM_MEMATTR_DEFAULT
+
 #endif /* !_MACHINE_VM_H_ */
diff --git a/usr.sbin/pciconf/pciconf.c b/usr.sbin/pciconf/pciconf.c
--- a/usr.sbin/pciconf/pciconf.c
+++ b/usr.sbin/pciconf/pciconf.c
@@ -1126,11 +1126,7 @@
 	if (*reg == '\0' || *el != '\0')
 		errx(1, "Invalid bar specification %s", reg);
 	pbm.pbm_flags = 0;
-#ifdef VM_MEMATTR_DEVICE
 	pbm.pbm_memattr = VM_MEMATTR_DEVICE;
-#else
-	pbm.pbm_memattr = VM_MEMATTR_UNCACHEABLE;
-#endif
 
 	fd = open(_PATH_DEVPCI, O_RDWR, 0);
 	if (fd < 0)