Re: [patch 2/2] cpu hotplug notifier for updating sched domains

[Nick Piggin]

Rusty Russell wrote:
> On Wed, 2004-09-08 at 12:19, Nick Piggin wrote:

> > Do you have a theoretical race here? Can we hotplug a CPU before the notifier
> > is registered? (I know we *can't* because it is still earlyish boot).
>
>
> No, init has so many serial assumptions that this is the least of our
> worries.

No. But the point is, you cannot (easily) set something up like this:

"do some setup with this specific, valid cpu_online_map";
"register notifier so we can keep everything valid";

without a race between them. Protecting the notifier chain under a
different lock is the trivial fix. I'll send the patch if you'd
like?
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