linux-kernel - Re: [PATCH 6/8] ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64

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Date:	Wed, 25 Mar 2015 23:02:00 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	rjw@...ysocki.net, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
	lina.iyer@...aro.org, Lorenzo.Pieralisi@....com
Subject: Re: [PATCH 6/8] ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64

On 03/25/2015 09:54 PM, Paul Bolle wrote:
> A few nits are all I spotted.
>
> On Wed, 2015-03-25 at 10:07 +0100, Daniel Lezcano wrote:
>> --- a/drivers/cpuidle/Kconfig.arm
>> +++ b/drivers/cpuidle/Kconfig.arm
>
>> +config ARM_CPUIDLE
>> +        bool "Generic ARM/ARM64 CPU idle Driver"
>> +        select DT_IDLE_STATES
>> +        help
>> +          Select this to enable generic cpuidle driver for ARM.
>> +          It provides a generic idle driver whose idle states are configured
>> +          at run-time through DT nodes. The CPUidle suspend backend is
>> +          initialized by calling the CPU operations init idle hook
>> +          provided by architecture code.
>
> Start with a tab instead of 8 spaces, please.

Ok, I will send a fix for that on top of this patch.

>> --- /dev/null
>> +++ b/drivers/cpuidle/cpuidle-arm.c
>
>> +#include <linux/cpuidle.h>
>> +#include <linux/cpumask.h>
>> +#include <linux/cpu_pm.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>
> Is this include actually needed? I haven't tried building this without
> that include, but I spotted nothing obviously module related in this
> file.
>
>> +#include <linux/of.h>
>> +
>> +#include <asm/cpuidle.h>
>> +
>> +#include "dt_idle_states.h"
>
>> +static struct cpuidle_driver arm_idle_driver = {
>> +	.name = "arm_idle",
>> +	.owner = THIS_MODULE,
>
> Since this can only be built in, THIS_MODULE will (basically) be
> equivalent to NULL according to include/linux/export.h. So I suppose
> this line can be dropped.

Yeah, THIS_MODULE is present in all drivers. Very likely we can safely 
remove it.

>> +	/*
>> +	 * State at index 0 is standby wfi and considered standard
>> +	 * on all ARM platforms. If in some platforms simple wfi
>> +	 * can't be used as "state 0", DT bindings must be implemented
>> +	 * to work around this issue and allow installing a special
>> +	 * handler for idle state index 0.
>> +	 */
>> +	.states[0] = {
>> +		.enter                  = arm_enter_idle_state,
>> +		.exit_latency           = 1,
>> +		.target_residency       = 1,
>> +		.power_usage		= UINT_MAX,
>> +		.name                   = "WFI",
>> +		.desc                   = "ARM WFI",
>> +	}
>> +};
>
> I did notice that these two nits are already present in
> drivers/cpuidle/cpuidle-arm64.c. But since this patch is not just moving
> that file's content around, you might as well look into those two nits.

We can address the module code removal in a separate patchset as this is 
the case for all the drivers.


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