Re: [PATCH v3 2/3] CPU hotplug, Freezer: Synchronize CPU hotplugand freezer

[Alan Stern]

On Fri, 21 Oct 2011, Srivatsa S. Bhat wrote:

> Don't allow the freezer subsystem to race with CPU hotplug to ensure that
> during the entire duration for which the CPU hotplug notifications are run,
> the state of the system (with respect to the tasks being frozen or not)
> remains constant.
> 
> This patch introduces four notifications in the freezer subsystem,
> PM_FREEZE_PREPARE, PM_POST_FREEZE, PM_THAW_PREPARE and PM_POST_THAW.
> These help in making other subsystems aware of the freezer's activity.
> The CPU hotplug infrastructure hooks on to these notifications and
> synchronizes with the freezer.

It seems pointless to send out PM_POST_FREEZE and PM_THAW_PREPARE 
notifications.  No task will be running to be affected by them.

Alan Stern

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