Comment by kees99

That's the spirit! :-)

By the way, delving into obscure and hardware-specific kernel code, sometimes yields quite interesting generally-applicable problems. For example, @dougg3 did an (excellent!) series of articles about his work on bringing mainline kernel support to "Chumby 8", a somewhat obscure, but historically significant piece of hardware, and as a side-quest he stumbled into this:

https://www.downtowndougbrown.com/2024/04/why-is-my-cpu-usag...

...which is applicable to quite a few other machines.