Comment # 56 on bug 62959 from Alex Deucher

For stable kernels you need to use the stable branches:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
if you've already checked out Linus' tree, you can add the stable tree as a
remote:
git remote add stable
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
git fetch stable