hello.c

#include <linux/module.h>     /* Needed by all modules */
#include <linux/kernel.h>     /* Needed for KERN_INFO */
#include <linux/init.h>       /* Needed for the macros */

///< The license type -- this affects runtime behavior 
MODULE_LICENSE("GPL");

///< The author -- visible when you use modinfo 
MODULE_AUTHOR("Bob");

///< The description -- see modinfo 
MODULE_DESCRIPTION("A simple Hello world LKM!");

///< The version of the module 
MODULE_VERSION("0.1");

static int __init hello_start(void) {
    printk(KERN_INFO
           "Loading hello module...\n");
    printk(KERN_INFO
           "Hello world\n");
    return 0;
}

static void __exit hello_end(void) {
    printk(KERN_INFO
           "Goodbye Mr.\n");
}

module_init(hello_start);

module_exit(hello_end);