A kernel.org update

Entirety of kernel.org repositories take up about 30GB on the mirrors due to most of them being cloned via "git clone -s" and thus benefiting from object sharing between Linus's tree and every other clone of it (it's safe since Linus never rebases his tree or performs similar unsafe operations that would break shared repos). If repos are cloned without sharing, such as to our long-term backups, they take up about 250GB.