RE: [PATCH v6 04/12] x86/smpboot.c: Don't offline CPU0 if any irqcan not be migrated out of it and remove CPU0 check in smp_callin()

[Luck, Tony]

> Could we just standardize on NMI bringup during regular bootup?

I don't know for sure (Fenghua?) but I'd guess not. CPU#0 is being brought *back* online
by this NMI ... i.e. it has been online before, so interrupt vector tables and CR3
etc. have been set to Linux-y values. When bringing other cpus online for the first
time they have nothing set so we'd still have to use INIT.

-Tony
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