Kernel Module Init and Exit functions being called in wrong order

Question

I'm making a very simple hello world kernel module and getting some crazy behavior. This worked until I upgraded to kernel 3.3.8 and now it... Well, it's calling the `init` function on exit, and the `exit` function on initialize. I've made sure my names are correct ``` // Needed for module definitions #include // Needed for initilization modules #include // Must declare some license MODULE_LICENSE("Dual BSD/GPL"); // Function to be called on insmod // Returns 0 on success static int __init mymod_init(void) { // Prints kernel alert. Check /var/log/syslog printk(KERN_ALERT "Module was loaded, this is the printk."); return 0; } // Function to be called on rmmod static void __exit mymod_exit(void) { // Prints kernel alert. Check /var/log/syslog printk(KERN_ALERT "Module was unloaded, this is the printk"); } // Register these functions module_init(mymod_init); module_exit(mymod_exit); ``` Sample output: root@cop4610:/home/cop4610/Downloads/linux-3.3.8/mymodu…

Accepted Answer

It needed a newline!!!!!! Arrggg!!!

```
 printk(KERN_ALERT "Module was unloaded, this is the printk
");
```

and

```
 printk(KERN_ALERT "Module was loaded, this is the printk
");
```

It seems it wasn't really doing them out of order, it just appeared to, because the first one was not showing up until the second one was issued as the buffer was not flushed.

Kernel Module Init and Exit functions being called in wrong order

Solution

Problem