Re: [PATCH 1/2] cpufreq: try to resume policies which failed on last resume

From: Viresh Kumar
Date: Mon Jan 06 2014 - 01:27:26 EST

On 3 January 2014 17:25, Bjørn Mork <bjorn@xxxxxxx> wrote:
> Correct. And users not running a lock debugging kernel will of course
> not even see the warning.


>> - It only happens when cpufreq_add_dev() fails during hibernation while
>> we enable non-boot CPUs again to save image to disk. So, isn't a problem
>> for a system which doesn't have any issues with add_dev() failing on
>> hibernation
> Wrong. This was my initial assumption but I later found out that the
> issue is unrelated to hibernation failures. Sorry about the confusion.

Hmm.. Can we have the latest warning logs you have? Earlier ones were
related to hibernation..

>> - There is a contention of locks in the order they are taken. And the contention
>> looks to be between, hotplug lock taken by cpu_online_cpus() and s_active
>> lock for sysfs files. Don't know what's the role of previous write to
>> sysfs files.
>> As that should finish before hibernation starts and so all locks should be back
>> in place.
> Yes, that seems logical. But I guess this is where it fails?

It looked like that.. Though your new logs might indicate something else.
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