diff --git a/sys/compat/linuxkpi/common/include/linux/kstrtox.h b/sys/compat/linuxkpi/common/include/linux/kstrtox.h
--- a/sys/compat/linuxkpi/common/include/linux/kstrtox.h
+++ b/sys/compat/linuxkpi/common/include/linux/kstrtox.h
@@ -7,6 +7,7 @@
  * Copyright (c) 2018 Johannes Lundberg <johalun0@gmail.com>
  * Copyright (c) 2020-2022 The FreeBSD Foundation
  * Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
+ * Copyright (c) 2023 Serenity Cyber Security, LLC
  *
  * Portions of this software were developed by Bjoern A. Zeeb and
  * Emmanuel Vadot under sponsorship from the FreeBSD Foundation.
@@ -193,6 +194,12 @@
 	return (0);
 }
 
+static inline int
+kstrtoll(const char *cp, unsigned int base, long long *res)
+{
+	return (kstrtos64(cp, base, (s64 *)res));
+}
+
 static inline int
 kstrtou64(const char *cp, unsigned int base, u64 *res)
 {