Kernel prepatch 6.15-rc1

Linus has released 6.15-rc1 and closed themerge window for this release. "As expected, this was one of the biggermerge windows, almost certainly just because we had some pent-updevelopment due to the previous releases being impacted by the holidayseason. That said, while it's bigger than normal, it's not some kind ofrecord-breaking thing.". In the end, 12.633 non-merge changesets werepulled into the mainline during this merge window.