> > softlockup: remove get_online_cpus() which doesn't help here.
> >
> > The get_online_cpus() protection seems to be bogus in
> > kernel/softlockup.c as cpu cached in check_cpu can go offline once
> > we do a put_online_cpus().
> >
> > This can also cause deadlock during a cpu offline as follows:
i'm wondering, what's the proper CPU-hotplug safe sequence here then?
I'm picking a CPU number from cpu_online_map, and that CPU could go away
while i'm still using it, right? What's saving us here?
Ingo
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