[$] The beginning of the 7.3 merge window

As of this writing, 2,346 non-merge changesets have been pulled into themainline repository for the 7.3 kernel release. That, clearly, is a meredown payment on the flood that is to come. Even so, those early pullsbrought in some noteworthy changes, including (but not limited to) asignificant reworking of how group scheduling works on multiprocessorsystems.