hello3.c

/*  
 *  Illustrating the __init, __initdata and __exit macros.
 */
#include <linux/module.h>	/* Needed by all modules */
#include <linux/kernel.h>	/* Needed for KERN_ALERT */
#include <linux/init.h>		/* Needed for the macros */

/*
 * Data gets initalized during the insertion process itself.
 */
static int hello3_data __initdata = 3;

static int __init hello_3_init(void)
{
	printk(KERN_INFO "Hello, world %d\n", hello3_data);
	return 0;
}

static void __exit hello_3_exit(void)
{
	printk(KERN_INFO "Goodbye, world 3\n");
}

/*
 * Macros defined in the kernel itself for
 * calling functions during insertion and deletion
 */
module_init(hello_3_init);
module_exit(hello_3_exit);