Hi!

Previous 'version' is at [1], but this one is vastly expanded, so I didn't
really bother keeping count.

Anyway, all this started with me breaking core-scheduling [2] and then trying
to fix it all up. Because holidays, this all got delayed, and then TJ had a few
patches fixing core-sched for ext [3] (which, if/when this lands, can be
simplified again).

Anyhow, these patches survive both Aaron's test case [4] and Prateek's [5].


[1] https://lore.kernel.org/r/20260624121327.190063948@infradead.org
[2] https://lore.kernel.org/all/20260611113219.GG187714@noisy.programming.kicks-ass.net/
[3] https://lore.kernel.org/r/20260807210221.232543-1-tj@kernel.org
[4] https://patch.msgid.link/3898f82d-e48a-48d5-a13d-54fa5387a203%40amd.com
[5] https://patch.msgid.link/20260821024335.GA3046103%40bytedance.com