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
@@ -403,6 +403,13 @@
 }
 #endif
 
+struct device;
+static inline void *
+devm_ioremap(struct device *dev, resource_size_t offset, resource_size_t size)
+{
+	return (NULL);
+}
+
 #ifdef VM_MEMATTR_DEVICE
 #define	ioremap_nocache(addr, size)					\
     _ioremap_attr((addr), (size), VM_MEMATTR_DEVICE)