Hi Chinex,
I had the exact same problem, which I got answered at StackOverflow (how-to-get-an-specific-kernel-version-to-the-extraversion-digit-from-git)
If you clone from Linus tree (git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git) you won't get the v2.6.38.8 tag, but if you clone from the stable tree (git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git) it will be there.
Then, after you have cloned the proper tree, you can check it out as a private branch to work on it with:
Quote:
git checkout -b your_branch_name v2.6.38.8
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