It still is diff/patch based (and several people including Andrew Morton don't use Git, they use stuff like quilt). All of the code review is done on patches se

It still is diff/patch based (and several people including Andrew Morton don't use Git, they use stuff like quilt). All of the code review is done on patches sent to LKML, git is only used as a merging mechanism for developers to manage their changes. And if you look at Patchwork and other things like that, they have an insane amount of tooling around tracking mailing list patches.