[TAG] Starting to explore the Linux kernel code

[Deepak Mishra]

Hello Everyone ( Answer Gang),
I have gone through the basics of OS and now trying to explore and
understand the linux kernel code.
I am confused from where I should start.
Just to make my life easier, I am thinking to to document the function
calls from the login prompt to bash or any shell prompt.

Then I want to go in reverse direction and find out how I came up to a
log in prompt.

As at log in prompt I see  <hostname> login:
so I tried to grep for the "login:" in .c files. but really could not
find the the proper location in the source code.
I have a 2.6.15-01.2054_FC5 source code.

Am very very interested to understand this code. I understand C
language quite well.

I have 3 questions.
1. Is this approach to understand the linux kernel code all right?
2. If any one can give me some hint where I can find the login related
code or where I should start .. I will be very glad.
3. Is there any documentation available which I can use as reference?

thank you verry much.
Regards
Deepak