Linux has released the 5.9-rc1 kernel
prepatch and closed the merge window for this development cycle.
“This merge window felt a lot more normal than 5.8, and all the stats
confirm that it seems to be the usual size.” In the end, 12,866
non-merge changesets were pulled for 5.9-rc1, as compared to 14,206 for
5.8-rc1.

Source: LWN.net – Kernel prepatch 5.9-rc1