Re: broken suspend (sched related) [Was: 2.6.24-rc4-mm1]

[Ingo Molnar <mingo@elte.hu>]

> > 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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