[$] 4.20 Merge window part 2

At the end of the 4.20 merge window, 12,125 non-mergechangesets had been pulled into the mainline kernel repository; 6,390 camein since last week's summary was written.As is often the case, the latter part of the merge window contained alarger portion of cleanups and fixes, but there were a number of newfeatures in the mix as well.