On Wed, Jun 26, 2013 at 03:29:40PM +0100, David Laight wrote:
> > Once stop_machine() is gone from the CPU offline path, we won't be able
> > to depend on disabling preemption to prevent CPUs from going offline
> > from under us.
>
> Could you use an rcu-like sequence so that disabling pre-emption
> would be enough?
>
> Something like rebuilding the cpu list, then forcing yourself
> to run on all the cpu.
>
> That would be far less intrusive.
It would also increase the latency of CPU-hotunplug operations.
Thanx, Paul
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