The repos already come with a short README which should cover the basics, but here is a short command cheat-sheet:

1. make sure you have no uncommitted changes in your repo (git clean in step 11 will otherwise remove them)
2. build your kernel source. It has to be a successful, complete, boot-able build. The module will only work for this one build.
3. cd /my/sensible/kernel/source/folder/
4. git clone git-url-of-above-repo
5. cd above-repo-name
6. sed -i '/KERNEL_BUILD := /c\KERNEL_BUILD := ../' Makefile
7. make
8. cd ..
9. cp arch/arm/boot/zImage YOUR_OUT_DIR/kernel/
10. find . -name \*.ko -exec cp '{}' YOUR_OUT_DIR/modules/ ';'
11. git clean -f -d
12. if everything went alright, you should now see your zImage + modules (including kcontrol_gpu_msm/tegra.ko) in YOUR_OUT_DIR

Here is a quick overview:

Here is a quick overview: