__init call in linux kernel..How are they called?

I always had this doubt about how the Linux drivers and internal core gets loaded in kernel. How do we decide which drive to load first as there are many dependencies for each of them. So, I raised this question and here is the answer StackOverflow. 

This really helped me understanding the booting of Linux Kernel so I thought of sharing with ya all. 

Signing off for a better Sunday :)