linux-kernel - Re: [PATCH v4 2/5] cpufreq: Keep track of which CPU owns the kobj/sysfs nodes separately

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Date:	Thu, 7 Aug 2014 14:32:03 +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 v4 2/5] cpufreq: Keep track of which CPU owns the
 kobj/sysfs nodes separately

On 25 July 2014 06:37, Saravana Kannan <skannan@...eaurora.org> wrote:
> The ownership of the kobj doesn't need to match policy->cpu or change as
> frequently. So, keep track of it separately.
>
> Signed-off-by: Saravana Kannan <skannan@...eaurora.org>
> ---
>  drivers/cpufreq/cpufreq.c | 4 +++-
>  include/linux/cpufreq.h   | 1 +
>  2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
> index ee0eb7b..af4f291 100644
> --- a/drivers/cpufreq/cpufreq.c
> +++ b/drivers/cpufreq/cpufreq.c
> @@ -868,7 +868,7 @@ static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy)
>         for_each_cpu(j, policy->cpus) {
>                 struct device *cpu_dev;
>
> -               if (j == policy->cpu)
> +               if (j == policy->kobj_cpu)
>                         continue;
>
>                 pr_debug("Adding link for CPU: %u\n", j);
> @@ -917,6 +917,7 @@ static int cpufreq_add_dev_interface(struct cpufreq_policy *policy,
>                         goto err_out_kobj_put;
>         }
>
> +       policy->kobj_cpu = policy->cpu;

Not here but in __cpufreq_add_dev()..

>         ret = cpufreq_add_dev_symlink(policy);
>         if (ret)
>                 goto err_out_kobj_put;
> @@ -1330,6 +1331,7 @@ static int cpufreq_nominate_new_policy_cpu(struct cpufreq_policy *policy,

This doesn't exist anymore.

>
>                 return -EINVAL;
>         }
> +       policy->kobj_cpu = cpu_dev->id;
>
>         return cpu_dev->id;
>  }
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index ec4112d..91c2e38 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -68,6 +68,7 @@ struct cpufreq_policy {
>         unsigned int            cpu;    /* cpu nr of CPU managing this policy */
>         unsigned int            last_cpu; /* cpu nr of previous CPU that managed
>                                            * this policy */
> +       unsigned int            kobj_cpu; /* Tracks which CPU own the kobj */
>         struct clk              *clk;
>         struct cpufreq_cpuinfo  cpuinfo;/* see above */
>
> --
> 1.8.2.1
>
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
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