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

static int debug;

int init_module(void)
{
    printk(KERN_INFO "Hello world, debug = %d\n", debug);
    return 0;
}

void cleanup_module(void)
{
    printk(KERN_INFO "Goodbye world, debug = %d\n", debug);
}

MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debug level: 0-9 (default=0)");