Given 15k commits per Linux release (see e.g. http://lkml.iu.edu/hypermail/linux/kernel/2105.1/00457.html http://lkml.iu.edu/hypermail/linux/kernel/2105.1/00457

Given 15k commits per Linux release (see e.g. http://lkml.iu.edu/hypermail/linux/kernel/2105.1/00457.html http://lkml.iu.edu/hypermail/linux/kernel/2105.1/00457.html), that's actually trailing just two upstream kernel releases. That's pretty good for a small project.