Re: [PATCH 02/10] cpufreq: conservative: Avoid races with transition notifier

On 23-06-15, 21:23, Preeti U Murthy wrote:

On 06/22/2015 01:32 PM, Viresh Kumar wrote:

quoted

It is possible that cpufreq transition notifier is called while the
governor is performing its EXIT operation. If this happens, 'ccdbs'

When does this happen ? As far as I can see, cpufreq transition notifier
gets called from the cpufreq kworker or when we set the cpufreq limits.

Which kworker are you talking about here ? The work-handlers of
ondemand/conservative governors ?

Conservative governor has registered for transition notifier and that
will be called every time frequency of a CPU is updated. And that has
nothing to do with the governor callbacks. These notifiers are called
from the ->target() routines of the drivers.

And from your previous patches, an exit operation only proceeds after
ensuring that no kworker is running (check on ccdbs->policy). And LIMIT
operation does not run in parallel too.

Does it look better from the earlier description?

-- 
viresh