Boot up fail with linux-next source code tag next-20141226

[Sunil Shahu]

Hi,
I am trying to build and boot linux-next kernel tree. 
My original kernel with Ubuntu 12.04 LTS was 3.5.0-23-generic. 
I checked out code with tag next-20141226. I generated a ".config" file with "make localmodconfig". I installed modules and kernel.On restart PC do not boot up. 
I then checked out tag v3.16-rc3 and booted. It worked pretty good and booted properly.
I had few question from this exercise:
1) Why my PC didn't boot up with linux-next kernel?2) Do I need to apply any specific patches to boot mainline linux-next kernel on my Ubuntu 12.04 PC?3) How do people test mainline kernel-next? Do they apply their OS specific patch on linux-next tree or test linux-next on some specific OS?
Thanks,Sunil.
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