Kernel prepatch 5.15-rc7

The 5.15-rc7 kernel prepatch is out, ratherlater than would have normally been expected due to Linus's travel schedule.

But please do give it a good testing to make sure we've shaken outany issues. I have yet more travel coming up next week, so it wouldbe very convenient for me to delay the merge window if I get theexcuse to do so, but right now that looks unlikely.