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

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Date:	Wed, 6 Feb 2013 15:28:34 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...k.pl, Borislav Petkov <bp@...en8.de>
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org,
	robin.randhawa@....com, Steve.Bannister@....com,
	Liviu.Dudau@....com, Viresh Kumar <viresh.kumar@...aro.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>
Subject: Re: [PATCH 0/4] CPUFreq: Implement per policy instances of governors

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
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