Re: [PATCH 0/4] arch/CPU hotplug: Add missing CPU Hotplug bits tofix nasty issues

[Peter Zijlstra]

On Thu, 2012-03-22 at 13:13 +0100, Peter Zijlstra wrote:
> 
> Furthermore, I was pondering the scenario where a 3rd cpu IPIs the newly
> booting cpu, I suspect we need a smp_wmb() after setting cpu_active and
> a rmb in select_fallback_rq() before reading active.

Hmm, not IPI, that would be covered by the disabling of interrupts on
bringup, but somehow manage to wake a thread that's strictly affine that
the fresh cpu, like queue_work_on() or so.


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