Kernel prepatch 5.16-rc5

The 5.16-rc5 kernel prepatch is out fortesting.

Do give it a good testing - with the holidays coming up, things areprobably going to slow down both on the development and testing front,and as a result I expect that I will also extend the rc series byanother week not because it's necessarily needed (too early to tell,but doesn't feel that way), but simply because nobody will want toopen the next merge window immediately in the new year.

One small change of note in this -rc is that the default limit for thenumber of pages that can be locked into memory by an unprivileged processhas been raised to8MB; see this article for a summary of thediscussions leading up to this change.