linux-kernel - Re: [PATCH v3 1/2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend

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Date:	Wed, 16 Jul 2014 14:00:00 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	"Rafael J . Wysocki" <rjw@...ysocki.net>,
	Todd Poynor <toddpoynor@...gle.com>,
	"Srivatsa S . Bhat" <srivatsa@....edu>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v3 1/2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend

On 16 July 2014 05:58, Saravana Kannan <skannan@...eaurora.org> wrote:
>> +       if (!cpus && cpufreq_driver->stop_cpu &&
>> cpufreq_driver->setpolicy) {
>> +               cpufreq_driver->stop_cpu(policy);
>> +       }
>>
>
> Viresh, I tried your suggestion (and my initial thought too) to combine this
> as an if/else with the previous if. But the indentation got nasty and made
> it hard to read. I'm sure the compiler will optimize it. So, I would prefer
> to leave it this way.

Okay, I gave that comment again :)

Try this:

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index f72b2b7..092a0ba 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -991,8 +991,10 @@ static int cpufreq_change_policy_cpus(struct
cpufreq_policy *policy,
                                        CPUFREQ_UPDATE_POLICY_CPU, policy);
        }

-       cpus = !cpumask_empty(policy->cpus);
-       if (has_target() && cpus) {
+       if (!cpumask_empty(policy->cpus)) {
+               if (!has_target())
+                       goto unlock;
+
                ret = __cpufreq_governor(policy, CPUFREQ_GOV_START);
                if (!ret)
                        ret = __cpufreq_governor(policy, CPUFREQ_GOV_LIMITS);
@@ -1001,9 +1003,7 @@ static int cpufreq_change_policy_cpus(struct
cpufreq_policy *policy,
                        pr_err("%s: Failed to start governor\n", __func__);
                        goto unlock;
                }
-       }
-
-       if (!cpus && cpufreq_driver->stop_cpu && cpufreq_driver->setpolicy) {
+       } else if (cpufreq_driver->stop_cpu && cpufreq_driver->setpolicy) {
                cpufreq_driver->stop_cpu(policy);
        }
--
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