[$] The rest of the 5.15 merge window

Linus Torvalds released 5.15-rc1 and closedthe merge window for this release on September 12; at that point, 10,471 non-mergechangesets had found their way into the mainline repository. Thosechangesets contain a lot of significant changes and improvements. Read onfor a summary of what came into the mainline in the roughly 7,000changesets pulled since our first-halfsummary was written.