diff --git a/sys/compat/linuxkpi/common/include/linux/device.h b/sys/compat/linuxkpi/common/include/linux/device.h
--- a/sys/compat/linuxkpi/common/include/linux/device.h
+++ b/sys/compat/linuxkpi/common/include/linux/device.h
@@ -4,6 +4,10 @@
  * Copyright (c) 2010 Panasas, Inc.
  * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
  * All rights reserved.
+ * Copyright (c) 2021-2022 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by Björn Zeeb
+ * under sponsorship from the FreeBSD Foundation.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -600,6 +604,21 @@
 	return (p);
 }
 
+static inline void *
+devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp)
+{
+	void *dst;
+
+	if (len == 0)
+		return (NULL);
+
+	dst = devm_kmalloc(dev, len, gfp);
+	if (dst != NULL)
+		memcpy(dst, src, len);
+
+	return (dst);
+}
+
 #define	devm_kzalloc(_dev, _size, _gfp)				\
     devm_kmalloc((_dev), (_size), (_gfp) | __GFP_ZERO)