By the time the 5.12
kernel was finally released, some
13,015 non-merge changesets had been pulled into the mainline
repository for this development cycle. That makes 5.12 the slowest
development cycle since 5.6, which was released at the end of March 2020.
Still, there was plenty of work done for 5.12. Read on for our traditional
look at where that work came from and how it got into the kernel.

Source: LWN.net – [$] Some 5.12 development statistics