When the 5.6 kernel was released on
March 29, 12,665 non-merge changesets had been accepted from 1,712
developers, making this a fairly typical development cycle in a number of
ways. As per longstanding LWN tradition, what follows is a look at where
those changesets came from and who supported the work that created them.
This may have been an ordinary cycle, but there are still a couple of
differences worth noting.

Source: LWN.net – [$] Some 5.6 kernel development statistics