LinuxKPI: Add linux/nodemask.h

and dummy num_possible_nodes() implementation.
We do not fully support NUMA in LinuxKPI yet.

Sponsored by:	Serenity CyberSecurity, LLC
MFC after:	1 week
Reviewed by:	manu, bz
Differential Revision:	https://reviews.freebsd.org/D45613

sys/compat/linuxkpi/common/include/linux/nodemask.h

@@ -0,0 +1,40 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 Serenity Cyber Security, LLC.
+ *
+ * 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 _LINUXKPI_LINUX_NODEMASK_H_
+#define	_LINUXKPI_LINUX_NODEMASK_H_
+
+#include <linux/kernel.h>	/* pr_debug */
+
+static inline int
+num_possible_nodes(void)
+{
+	pr_debug("%s: TODO\n", __func__);
+	return (1);
+}
+
+#endif /* _LINUXKPI_LINUX_NODEMASK_H_ */

sys/compat/linuxkpi/common/include/linux/sched.h

@@ -42,6 +42,7 @@
 #include <linux/completion.h>
 #include <linux/hrtimer.h>
 #include <linux/mm_types.h>
+#include <linux/nodemask.h>
 #include <linux/pid.h>
 #include <linux/slab.h>
 #include <linux/string.h>