linux-kernel - Re: [PATCH v5 1/5] ACPI / processor_idle: introduce ACPI_PROCESSOR

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Date:	Wed, 11 May 2016 17:57:28 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Vikas Sajjan <vikas.cha.sajjan@....com>,
	Sunil <sunil.vl@....com>,
	Prashanth Prakash <pprakash@...eaurora.org>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Al Stone <al.stone@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	the arch/x86 maintainers <x86@...nel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>
Subject: Re: [PATCH v5 1/5] ACPI / processor_idle: introduce
 ACPI_PROCESSOR_CSTATE



On 11/05/16 17:23, Rafael J. Wysocki wrote:
> On Wed, May 11, 2016 at 5:37 PM, Sudeep Holla <sudeep.holla@....com> wrote:
>> ACPI 6.0 adds a new method to specify the CPU idle states(C-states)
>> called Low Power Idle(LPI) states. Since new architectures like ARM64
>> use only LPIs, introduce ACPI_PROCESSOR_CSTATE to encapsulate all the
>> code supporting the old style C-states(_CST).
>>
>> This patch will help to extend the processor_idle module to support
>> LPI.
>>
>> Cc: x86@...nel.org
>> Cc: linux-ia64@...r.kernel.org
>> Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
>> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
>> ---
>>   arch/ia64/Kconfig             |  1 +
>>   arch/x86/Kconfig              |  1 +
>>   drivers/acpi/Kconfig          |  4 +++
>>   drivers/acpi/processor_idle.c | 80 ++++++++++++++++++++++++++++---------------
>>   include/acpi/processor.h      |  2 +-
>>   5 files changed, 60 insertions(+), 28 deletions(-)
>>
>> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
>> index b534ebab36ea..e820670d7243 100644
>> --- a/arch/ia64/Kconfig
>> +++ b/arch/ia64/Kconfig
>> @@ -15,6 +15,7 @@ config IA64
>>          select ARCH_MIGHT_HAVE_PC_SERIO
>>          select PCI if (!IA64_HP_SIM)
>>          select ACPI if (!IA64_HP_SIM)
>> +       select ACPI_PROCESSOR_CSTATE if ACPI
>
> You don't need this ->
>
>>          select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
>>          select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
>>          select HAVE_UNSTABLE_SCHED_CLOCK
>> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
>> index 2dc18605831f..cb3e14757c9c 100644
>> --- a/arch/x86/Kconfig
>> +++ b/arch/x86/Kconfig
>> @@ -18,6 +18,7 @@ config X86_64
>>   config X86
>>          def_bool y
>>          select ACPI_LEGACY_TABLES_LOOKUP        if ACPI
>> +       select ACPI_PROCESSOR_CSTATE            if ACPI
>>          select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
>>          select ANON_INODES
>>          select ARCH_CLOCKSOURCE_DATA
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index b7e2e776397d..093bfcc4f9c3 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -213,6 +213,10 @@ config ACPI_CPU_FREQ_PSS
>>          bool
>>          select THERMAL
>>
>> +config ACPI_PROCESSOR_CSTATE
>> +       bool
>
> -> if you do "def_bool y" here.
>

I agree and I did exactly the same, but then was not sure on your
preference. So dropped it :)

-- 
Regards,
Sudeep