linux-kernel - Re: [PATCH V3 2/4] cpufreq: governor: Implement per policy instances of governors

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Date:	Wed, 27 Mar 2013 09:59:25 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Jacob Shin <jacob.shin@....com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, cpufreq@...r.kernel.org,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-kernel@...ts.linaro.org, robin.randhawa@....com,
	Steve.Bannister@....com, Liviu.Dudau@....com,
	charles.garcia-tobin@....com,
	Arvind Chauhan <Arvind.Chauhan@....com>
Subject: Re: [PATCH V3 2/4] cpufreq: governor: Implement per policy instances
 of governors

On 27 March 2013 01:18, Jacob Shin <jacob.shin@....com> wrote:
> On Wed, Mar 27, 2013 at 01:02:15AM +0530, Viresh Kumar wrote:
>> +struct dbs_data *gdbs_data;
>> +
>
> Hmm .. I don't think this works for both ondemand and conservative
> governors running at the same time .

Yes, this should fix it (untested for now, i will provide a complete fix
today):

diff --git a/drivers/cpufreq/cpufreq_governor.c
b/drivers/cpufreq/cpufreq_governor.c
index f29feb4..54ca5fc 100644
--- a/drivers/cpufreq/cpufreq_governor.c
+++ b/drivers/cpufreq/cpufreq_governor.c
@@ -29,9 +29,6 @@

 #include "cpufreq_governor.h"

-/* Common data for platforms that don't need governor instance per policy */
-struct dbs_data *gdbs_data;
-
 static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
 {
        u64 idle_time;
@@ -233,7 +230,7 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
        if (have_multiple_policies())
                dbs_data = policy->governor_data;
        else
-               dbs_data = gdbs_data;
+               dbs_data = cdata->gdbs_data;

        WARN_ON(!dbs_data && (event != CPUFREQ_GOV_POLICY_INIT));

@@ -289,7 +286,7 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                }

                if (!have_multiple_policies())
-                       gdbs_data = dbs_data;
+                       cdata->gdbs_data = dbs_data;

                return 0;
        case CPUFREQ_GOV_POLICY_EXIT:
@@ -307,7 +304,7 @@ int cpufreq_governor_dbs(struct cpufreq_policy *policy,

                        cdata->exit(dbs_data);
                        kfree(dbs_data);
-                       gdbs_data = NULL;
+                       cdata->gdbs_data = NULL;
                }

                policy->governor_data = NULL;
diff --git a/drivers/cpufreq/cpufreq_governor.h
b/drivers/cpufreq/cpufreq_governor.h
index 1f7de13..cc4a189 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -133,6 +133,9 @@ struct common_dbs_data {
        int governor;
        struct attribute_group *attr_group;

+       /* Common data for platforms that don't set have_multiple_policies */
+       struct dbs_data *gdbs_data;
+
        struct cpu_dbs_common_info *(*get_cpu_cdbs)(int cpu);
        void *(*get_cpu_dbs_info_s)(int cpu);
        void (*gov_dbs_timer)(struct work_struct *work);
--
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