[$] 5.9 Merge window, part 2

By the time Linus Torvalds released 5.9-rc1and closed the merge window for this cycle, 12,866 non-merge changesets hadbeen pulled into the mainline repository. Nearly 9,000 of those came inafter the first 5.9 merge-window summarywas written. Clearly the kernel-development community remains busy. Muchof what was merged takes the form of cleanups and restructuring, as always,but there was also a substantial set of new features.