diff --git a/sys/compat/linuxkpi/common/include/linux/io-mapping.h b/sys/compat/linuxkpi/common/include/linux/io-mapping.h
--- a/sys/compat/linuxkpi/common/include/linux/io-mapping.h
+++ b/sys/compat/linuxkpi/common/include/linux/io-mapping.h
@@ -46,6 +46,8 @@
 	vm_memattr_t attr;
 };
 
+struct io_mapping *io_mapping_create_wc(resource_size_t base, unsigned long size);
+
 static inline struct io_mapping *
 io_mapping_init_wc(struct io_mapping *mapping, resource_size_t base,
     unsigned long size)
@@ -63,17 +65,6 @@
 	return (mapping);
 }
 
-static inline struct io_mapping *
-io_mapping_create_wc(resource_size_t base, unsigned long size)
-{
-	struct io_mapping *mapping;
-
-	mapping = kmalloc(sizeof(*mapping), GFP_KERNEL);
-	if (mapping == NULL)
-		return (NULL);
-	return (io_mapping_init_wc(mapping, base, size));
-}
-
 static inline void
 io_mapping_fini(struct io_mapping *mapping)
 {
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -87,6 +87,7 @@
 #include <linux/kthread.h>
 #include <linux/kernel.h>
 #include <linux/compat.h>
+#include <linux/io-mapping.h>
 #include <linux/poll.h>
 #include <linux/smp.h>
 #include <linux/wait_bit.h>
@@ -2716,6 +2717,17 @@
 	   lkpi_net_maxpps));
 }
 
+struct io_mapping *
+io_mapping_create_wc(resource_size_t base, unsigned long size)
+{
+	struct io_mapping *mapping;
+
+	mapping = kmalloc(sizeof(*mapping), GFP_KERNEL);
+	if (mapping == NULL)
+		return (NULL);
+	return (io_mapping_init_wc(mapping, base, size));
+}
+
 #if defined(__i386__) || defined(__amd64__)
 bool linux_cpu_has_clflush;
 #endif