Kernel prepatch 6.19-rc4

The 6.19-rc4 kernel prepatch is out fortesting.

So this rc is still a bit smaller than usual, but it's not _much_smaller, and I think next week is likely going to be more or lessback to normal.

Which is all exactly as expected, and nothing here looksparticularly odd. I'll make an rc8 this release just because of thetime lost to the holidays, not because it looks like we'd have anyparticular issues pending (knock wood).