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SubjectRe: Notifier chains are unsafe
On Wed, 26 Oct 2005, Andreas Kleen wrote:

> > Note that the RCU documentation says RCU critical sections are not
> > allowed
> > to sleep.
>
> In this case it would be ok.

I don't understand. If it's okay for an RCU critical section to sleep in
this case, why wouldn't it be okay always? What's special here?

Aren't there requirements about critical sections finishing on the same
CPU as they started on?

Can you please explain in more detail?

Alan Stern

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