Kernel prepatch 7.2-rc6

The 7.2-rc6 kernel prepatch is out for
testing. Quoth Linus: "Hmm. This rc is huge. Even by the "new normal"
standards this is a big rc, and I think it's the biggest rc6 we've had in
years at least by commit count." There were 537 non-merge commits
applied between 7.2-rc5 and 7.2-rc6.