[$] 5.16 Merge window, part 1

As of this writing, Linus Torvalds has pulled exactly 6,800 non-mergechangesets into the mainline repository for the 5.16 kernel release. Thatis probably a little over half of what will arrive during this mergewindow, so this is a good time to catch up on what has been pulled so far.There are many significant changes and some large-scale restructuring ofinternal kernel code, but relatively few ground-breaking newfeatures.