linux-kernel - Re: [PATCH 0/4] CPUFreq: Implement per policy instances of governors

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Date:	Wed, 6 Feb 2013 15:38:49 +0530
From:	Amit Kucheria <amit.kucheria@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	rjw@...k.pl, Borislav Petkov <bp@...en8.de>,
	Steve Bannister <Steve.Bannister@....com>,
	Lists linaro-dev <linaro-dev@...ts.linaro.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	cpufreq@...r.kernel.org,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>
Subject: Re: [PATCH 0/4] CPUFreq: Implement per policy instances of governors

On Wed, Feb 6, 2013 at 3:28 PM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
> On 5 February 2013 21:51, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>> commit 15b5548c9ccfb8088270f7574710d9d67edfe33b
>> Author: Viresh Kumar <viresh.kumar@...aro.org>
>> Date:   Tue Feb 5 21:29:05 2013 +0530
>>
>>     cpufreq: Make governors directory sysfs location based on
>> have_multiple_policies
>>
>>     Until now directory for governors tunables was getting created in
>>     cpu/cpufreq/<gov-name>. With the introduction of following patch:
>>     "cpufreq: governor: Implement per policy instances of governors"
>>
>>     this directory would be created in
>> cpu/cpu<num>/cpufreq/<gov-name>. This might
>>     break userspace of existing platforms. Lets do this change only
>> for platforms
>>     which need support for multiple policies and thus above mentioned patch.
>>
>>     From now on, such platforms would be require to do following from
>> their init()
>>     routines:
>>
>>         policy->have_multiple_policies = true;
>>
>>     Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
>> ---
>>  drivers/cpufreq/cpufreq_governor.c |  2 +-
>>  include/linux/cpufreq.h            | 14 ++++++++++++++
>>  2 files changed, 15 insertions(+), 1 deletion(-)
>
> Hi Rafael,
>
> Because this patch was quite big (317 insertions(+), 238 deletions(-)), i was
> planning a detailed self review to capture any mistakes and luckily i found
> one for above patch :)
>
> diff --git a/drivers/cpufreq/cpufreq_governor.c
> b/drivers/cpufreq/cpufreq_governor.c
> index 41ee86f..fe037c0 100644
> --- a/drivers/cpufreq/cpufreq_governor.c
> +++ b/drivers/cpufreq/cpufreq_governor.c
> @@ -342,7 +342,8 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
>                 mutex_lock(&dbs_data->mutex);
>                 mutex_destroy(&cpu_cdbs->timer_mutex);
>
> -               sysfs_remove_group(&policy->kobj, dbs_data->cdata->attr_group);
> +               sysfs_remove_group(get_governor_parent_kobj(policy),
> +                               dbs_data->cdata->attr_group);
>                 if (dbs_data->cdata->governor == GOV_CONSERVATIVE)
>                         cpufreq_unregister_notifier(cs_ops->notifier_block,
>                                         CPUFREQ_TRANSITION_NOTIFIER);
>
> I have pushed the complete patchset here:
>
> http://git.linaro.org/gitweb?p=people/vireshk/linux.git;a=shortlog;h=refs/heads/cpufreq-updates
>

Viresh, perhaps you should ask Stephen Rothwell to pull in your tree
to get some more testing before Rafael pulls it in for 3.10?
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