On Thu, Mar 20, 2014 at 5:40 PM, Gautham R. Shenoy
<e...@linux.vnet.ibm.com> wrote:
> From: "Srivatsa S. Bhat" <srivatsa.b...@linux.vnet.ibm.com>
>
> On POWER systems, the CPU frequency is controlled at a core-level and
> hence we need to serialize so that only one of the threads in the core
> switches the core's frequency at a time.

Probably you don't need this anymore.

https://lkml.org/lkml/2014/3/21/23
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