http://stackoverflow.com/questions/10368837/how-does-linux-determine-the-order-of-module-init-calls
The order specified there is:
- early_initcall
- pure_initcall
- core_initcall
- postcore_initcall
- arch_initcall
- subsys_initcall
- fs_initcall
- rootfs_initcall
- device_initcall
- late_initcall
