Re: [PATCH] sched/fair: Fix ksmd and kthreadd running on isolated CPU0 on arm64 systems

[wujing]

The reason this issue does not occur on x86 architecture is that x86 does not 
use the `select_idle_cpu` function for core selection. Instead, it uses the
`select_idle_smt` function. However, there is still an issue on x86 where 
isolated cores are not properly excluded. My other commit, 
`sched/fair: Correct CPU selection from isolated domain`, addresses the issue 
of isolated cores on x86.

> Your subject explicitly mentions arm64, however there is absolutely
> nothing arm64 specific to this patch, as such the subject is just plain
> wrong.