Index: sys/compat/linuxkpi/common/include/linux/mman.h
===================================================================
--- /dev/null
+++ sys/compat/linuxkpi/common/include/linux/mman.h
@@ -0,0 +1,38 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2022 Jean-Sébastien Pédron <dumbbell@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, 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.
+ */
+
+#ifndef _LINUX_MMAN_H
+#define _LINUX_MMAN_H
+
+/*
+ * In Linux, <linux/mman.h> includes <linux/percpu_counter.h>, which includes
+ * <linux/smp.h>.
+ */
+#include <linux/smp.h>
+
+#endif /* _LINUX_MMAN_H */
Index: sys/compat/linuxkpi/common/include/linux/smp.h
===================================================================
--- sys/compat/linuxkpi/common/include/linux/smp.h
+++ sys/compat/linuxkpi/common/include/linux/smp.h
@@ -29,6 +29,8 @@
 #ifndef _LINUXKPI_LINUX_SMP_H_
 #define	_LINUXKPI_LINUX_SMP_H_
 
+#include <asm/smp.h>
+
 /*
  * Important note about the use of the function provided below:
  *