On 07/31/2014 02:56 PM, Rafael J. Wysocki wrote:

On Thursday, July 24, 2014 06:07:26 PM Saravana Kannan wrote:

quoted

This patch simplifies a lot of the hotplug/suspend code by not
adding/removing/moving the policy/sysfs/kobj during hotplug and just leaves
the cpufreq directory and policy in place irrespective of whether the CPUs
are ONLINE/OFFLINE.

I'm still quite unsure how this is going to work with the real CPU hot-remove
that makes the entire sysfs cpu directories go away.  Can you please explain
that?

Sure. Not a problem. I just wanted to make sure you had a chance to look 
at the code first.

Physical hot-remove triggers a "remove" for all the  registered 
subsys_interfaces for that CPU (after going through a couple of 
functions). So, when that happens, the cpufreq subsys_interface remove 
for that CPU gets called. At that point, I clean up that CPU's SW states 
as if it was never plugged in from the start. If that CPU was the owner 
of the sysfs directory, I move it over to a different CPU.

-Saravana

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