How to update the custom compiled kernel to a new release using git

In a previous article I addressed how to compile a kernel for Ubuntu Intrepid using git and in a follow up article I explained how to compile a new release if you already compiled your own custom kernel using git. The upgrade article was written if the kernel upgrade was one where the only ABI number changed was the last one.
In this article I’ll explain how you can update your previously compiled custom kernel to a newer version, if you used git. This article won’t touch an upgrade of kernel 2.6.27 to 2.6.28.