diff --git a/sys/compat/linuxkpi/common/include/linux/uuid.h b/sys/compat/linuxkpi/common/include/linux/uuid.h
index a1f878b311a5..31a018497f78 100644
--- a/sys/compat/linuxkpi/common/include/linux/uuid.h
+++ b/sys/compat/linuxkpi/common/include/linux/uuid.h
@@ -1,40 +1,62 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause
  *
  * Copyright (c) 2021 The FreeBSD Foundation
  *
  * This software was 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
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
  *
  * $FreeBSD$
  */
 
 #ifndef	_LINUXKPI_LINUX_UUID_H
 #define	_LINUXKPI_LINUX_UUID_H
 
+#define	UUID_STRING_LEN	36
+
+#define	GUID_INIT(x0_3, x4_5, x6_7, x8, x9, x10, x11, x12, x13, x14, x15) \
+	((guid_t) { .x = { 						\
+		[0]  =  (x0_3)        & 0xff,				\
+		[1]  = ((x0_3) >> 8)  & 0xff,				\
+		[2]  = ((x0_3) >> 16) & 0xff,				\
+		[3]  = ((x0_3) >> 24) & 0xff,				\
+		[4]  =  (x4_5)        & 0xff,				\
+		[5]  = ((x4_5) >> 8)  & 0xff,				\
+		[6]  =  (x6_7)        & 0xff,				\
+		[7]  = ((x6_7) >> 8)  & 0xff,				\
+		[8]  =  (x8),						\
+		[9]  =  (x9),						\
+		[10] =  (x10),						\
+		[11] =  (x11),						\
+		[12] =  (x12),						\
+		[13] =  (x13),						\
+		[14] =  (x14),						\
+		[15] =  (x15)						\
+}})
+
 typedef struct {
 	char	x[16];
 } guid_t;
 
 #endif	/* _LINUXKPI_LINUX_UUID_H */