Linux 5.5 rc4

To absolutely nobody's surprise, last week was very quiet indeed. It'shardly even worth making an rc release, but there are _some_ fixes inhere, so here's the usual weekly Sunday afternoon rc.It's drivers (gpio, i915, scsi, libata), some cifs fixes, and io_uringfixes. And some kunit/selftest updates. And one or two other randomsmall things.Go test it, you still have some time before the New Year's Evecelebrations commence. Let's all hope for a happy new year, but Isuspect the next rc is going to be on the small side too as mostpeople are probably still in holiday mode..                  Linus