diff --git a/sys/compat/linuxkpi/check-dummy.sh b/sys/compat/linuxkpi/check-dummy.sh
new file mode 100644
--- /dev/null
+++ b/sys/compat/linuxkpi/check-dummy.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+#-
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2023 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.
+#
+#
+
+#
+# Check for "dummy" include files which now have an implementation.
+# Run manually from directory this file is located: sh ./check-dummy.sh
+#
+
+if [ ! -d dummy -o ! -d common ]; then
+	printf "USAGE: run from sys/compat/linuxkpi!\n" >&2
+	exit 1
+fi
+
+( cd dummy && find . -type f ) | \
+while read f; do
+
+	if test -f common/${f}; then
+
+		printf "\nDUPLICATE CANDIDATE: %s\n" ${f}
+		ls -l dummy/${f} common/${f}
+
+		# Check if the common is non-empty and that the dummy is empty.
+		if [ -s common/${f} -a ! -s dummy/${f} ]; then
+			rm dummy/${f}
+			git rm dummy/${f}
+		fi
+
+	fi
+
+done
+
+# end