linux-kernel - Re: [PATCH v1 6/6] ACPI: thermal: processor: Use the generic cpufreq infrastructure

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Date:	Thu, 29 May 2014 13:42:49 +0100
From:	"Javi Merino" <javi.merino@....com>
To:	Amit Daniel Kachhap <amit.daniel@...sung.com>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"amit.kachhap@...il.com" <amit.kachhap@...il.com>,
	"edubezval@...il.com" <edubezval@...il.com>,
	"rjw@...ysocki.net" <rjw@...ysocki.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"lenb@...nel.org" <lenb@...nel.org>
Subject: Re: [PATCH v1 6/6] ACPI: thermal: processor: Use the generic cpufreq
 infrastructure

Hi Amit,

On Thu, May 29, 2014 at 09:15:34AM +0100, Amit Daniel Kachhap wrote:
> This patch upgrades the ACPI cpufreq cooling portions to use the generic
> cpufreq cooling infrastructure. There should not be any functionality
> related changes as the same behaviour is provided by the generic
> cpufreq APIs with the notifier mechanism.
> 
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> ---
>  drivers/acpi/processor_driver.c  |    6 +-
>  drivers/acpi/processor_thermal.c |  235 ++++++++++++++++++--------------------
>  include/acpi/processor.h         |    3 +-
>  3 files changed, 115 insertions(+), 129 deletions(-)
> 
> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> index 7f70f31..10aba4a 100644
> --- a/drivers/acpi/processor_driver.c
> +++ b/drivers/acpi/processor_driver.c
> @@ -36,6 +36,7 @@
>  #include <linux/cpuidle.h>
>  #include <linux/slab.h>
>  #include <linux/acpi.h>
> +#include <linux/cpu_cooling.h>
> 
>  #include <acpi/processor.h>
> 
> @@ -178,8 +179,7 @@ static int __acpi_processor_start(struct acpi_device *device)
>         if (!cpuidle_get_driver() || cpuidle_get_driver() == &acpi_idle_driver)
>                 acpi_processor_power_init(pr);
> 
> -       pr->cdev = thermal_cooling_device_register("Processor", device,
> -                                                  &processor_cooling_ops);
> +       pr->cdev = acpi_processor_cooling_register(device);

With this you have removed the only cooling device whose type was
"Processor".  There's special code for dealing with this cooling
device in drivers/thermal/thermal_core.c:passive_store():

		list_for_each_entry(cdev, &thermal_cdev_list, node) {
			if (!strncmp("Processor", cdev->type,
				     sizeof("Processor")))
				thermal_zone_bind_cooling_device(tz,
						THERMAL_TRIPS_NONE, cdev,
						THERMAL_NO_LIMIT,
						THERMAL_NO_LIMIT);
		}
		mutex_unlock(&thermal_list_lock);
		if (!tz->passive_delay)

With your change, that code is now "dead" as it can't do anything.  No
I don't know what should you do with it, either remove it or make it
match the cpufreq cooling device.  But this patch should deal with
that code as well.

Cheers,
Javi


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