Index: sys/compat/linuxkpi/common/include/linux/kernel.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/kernel.h
+++ sys/compat/linuxkpi/common/include/linux/kernel.h
@@ -58,7 +58,7 @@
 #include <asm/processor.h>
 #include <asm/uaccess.h>
 
-#include <machine/stdarg.h>
+#include <linux/stdarg.h>
 
 #define KERN_CONT       ""
 #define	KERN_EMERG	"<0>"
Index: sys/compat/linuxkpi/common/include/linux/stdarg.h
===================================================================
--- /dev/null
+++ sys/compat/linuxkpi/common/include/linux/stdarg.h
@@ -0,0 +1,33 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Vladimir Kondratyev <wulf@FreeBSD.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice unmodified, this list of conditions, and the following
+ *    disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _LINUXKPI_STDARG_H_
+#define	_LINUXKPI_STDARG_H_
+
+#include <machine/stdarg.h>
+
+#endif	/* _LINUXKPI_STDARG_H_ */
Index: sys/compat/linuxkpi/common/include/linux/string.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/string.h
+++ sys/compat/linuxkpi/common/include/linux/string.h
@@ -39,6 +39,7 @@
 #include <linux/uaccess.h>
 #include <linux/err.h>
 #include <linux/bitops.h> /* for BITS_PER_LONG */
+#include <linux/stdarg.h>
 
 #include <sys/libkern.h>