Kernel Module Programming in 2.6

Hello. I'm trying to get into module programming, so I picked up both of the guides at the LDP. They were good guides, but for 2.4 or so I assume. I'm using 2.6 and whenever I insmod a module I write, It throws the error at me: "-1 Invalid module format" So I have the suspicition that I'm using old syntax that isn't used anymore. Some previous threads have transgressed this fact, but didn't offer a solution to the problem. Could anyone direct me to a guide for 2.6 (I couldn't find one) or correct this simple hello world code?

Code:

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


static int hello_2_init(void)
{
   printk(KERN_ALERT "Hello, world.\n");
   return 0;
}


static void hello_2_exit(void)
{
   printk(KERN_ALERT "Goodbye, world.\n");
}


module_init(hello_2_init);
module_exit(hello_2_exit);

I found your thread on linuxquestions.org so you might want to look at that thread, if you forgot:
http://www.linuxquestions.org/questions/history/168828