On Thu, 31 Mar 2016 06:09:13 -0000, Hrushit Parikh said:

The linux kernel of my repo is 4.5.0-rc+. I copied the existing .config file
from /boot to my source tree and ran 1. make olddefconfig, 2. make 3. make
modules_install install.

You probably wanted to use 'make oldconfig' rather than 'olddefconfig'.

To improve your build time a lot, try this:

1) copy that .config over.
2) Insert all your USB and other pluggable devices at least once, so they
get their drivers modprobed'd.
3) Use 'make localmodconfig' - this will only make modules for devices you
actually have (maybe 200) rather than the 4,000 or so a distro kernel builds.

Proceed with your steps 2 and 3.

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