On Tue, Dec 06, 2016 at 11:56:56AM -0600, Jeremy Linton wrote:

Hi,

Which might not be the right choice because
even without these ACPI specific bits, simply running a few cpus
online/offline while simultaneously doing something like `perf stat
-e cache-misses ls &` in a loop causes deadlocks/crashes.

That problem doesn't appear to be specific to the ACPI/PMU so I've
stayed away from it in this patch set, although potentially a larger
fix might cover this as well.

Urrgh; I can reproduce lockups on Seattle with v4.9-rc8.

I'll look into that.

If you see any more issues in this area, please report them in a new
thread.

Thanks,
Mark.