A copy of the System.map file generated in the kernel build process is necessary to reliably use ksplice on the Linode kernels. It would be helpful if it could be included in the source tarballs alongside the .config (that is, save it somewhere before the make clean :)

Edit: Looks like it's more 'helpful' than necessary, but it'd still be nice to have the original for future tarballs at least, rather than trying to recreate it by rebuilding with the exact same version compiler.