[PATCH v3 2/5] powernv, cpufreq:Add per-core locking to serialize frequency transitions

[Viresh Kumar]

On Thu, Mar 20, 2014 at 5:40 PM, Gautham R. Shenoy
<ego at linux.vnet.ibm.com> wrote:
> From: "Srivatsa S. Bhat" <srivatsa.bhat at 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