PORTVERSION lies: current version is based on 4.6, not 4.5. Let's use tag offsets for better clarity.
$ git describe --abbrev=12 $(make -V GH_TAGNAME) v4.6-rc5-413-ge145a5a5bdf4 $ git describe --abbrev=12 lkl/master v4.8-493-g4b77c32b1a88
https://github.com/lkl/linux/compare/e145a5a5bdf4...4b77c32b1a88