diff --git a/sys/compat/linuxkpi/common/include/linux/bitfield.h b/sys/compat/linuxkpi/common/include/linux/bitfield.h
--- a/sys/compat/linuxkpi/common/include/linux/bitfield.h
+++ b/sys/compat/linuxkpi/common/include/linux/bitfield.h
@@ -1,7 +1,7 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
- * Copyright (c) 2020 The FreeBSD Foundation
+ * Copyright (c) 2020-2024 The FreeBSD Foundation
  *
  * This software was developed by Björn Zeeb under sponsorship from
  * the FreeBSD Foundation.
@@ -131,6 +131,10 @@
 #define	FIELD_PREP(_mask, _value)					\
 	(((typeof(_mask))(_value) << __bf_shf(_mask)) & (_mask))
 
+/* Likely would need extra sanity checks compared to FIELD_PREP()? */
+#define	FIELD_PREP_CONST(_mask, _value)					\
+	(((typeof(_mask))(_value) << __bf_shf(_mask)) & (_mask))
+
 #define	FIELD_GET(_mask, _value)					\
 	((typeof(_mask))(((_value) & (_mask)) >> __bf_shf(_mask)))