Re: [PATCH] cpufreq: Set cpufreq_cpu_data to NULL before putting kobject

Viresh Kumar
2015-01-30T04:14:47Z

On 30 January 2015 at 09:16, ethan zhao <ethan.zhao@oracle.com> wrote:
> You mean the policy is shared by all CPUs, so PPC notification about one

A policy may or maynot be shared by multiple CPUs. It all depends on your
systems configuration. All CPUs which share clock line, share a policy.

You can verify that from /sys/devices/system/cpu/cpu*/related_cpus. This
gives the CPUs that share policy.

> CPU should update all CPU's policy, right ? even the requested CPU is
> shutting down.

CPUs sharing policy have a single policy structure. And so policy would
be updated for all CPUs that share the poilcy. Even if some cpu goes down,
the policy might still be up and running.

--
viresh