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This is the source code for the “Hello World” sample module referenced by Sample KMP spec file.

obj-m              := samplemod.o
samplemod-y        += main.o

/*
 * main.c - A demo kernel module.
 *
 * Copyright (C) 2003, 2004, 2005, 2006
 * Andreas Gruenbacher <agruen@suse.de>, SUSE Labs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * A copy of the GNU General Public License can be obtained from
 * http://www.gnu.org/.
 */

#include <linux/module.h>
#include <linux/init.h>

MODULE_AUTHOR("Andreas Gruenbacher <agruen@suse.de>");
MODULE_DESCRIPTION("Hello world module");
MODULE_LICENSE("GPL");
MODULE_VERSION(VERSION);

int param;

module_param(param, int, 0);
MODULE_PARM_DESC(param, "Example parameter");

void exported_function(void)
{
	printk(KERN_INFO "Exported function called.\n");
}
EXPORT_SYMBOL_GPL(exported_function);

int __init init_hello(void)
{
	printk(KERN_INFO "Hello world.\n");
	return 0;
}

void __exit exit_hello(void)
{
	printk(KERN_INFO "Goodbye world.\n");
}

module_init(init_hello);
module_exit(exit_hello);