Kernel prepatch 6.12-rc4

Linus has released https://lwn.net/Articles/994842/
 for testing.
"I'm not happy with how big this is - it's probably far from the biggest
rc4 ever, but it _is_ the biggest rc4 we've had in the 6.x series at least
in number of commits."

https://lwn.net/Articles/994843/