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

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Date:	Wed, 11 May 2016 18:23:00 +0200
From:	"Rafael J. Wysocki" <rafael@...nel.org>
To:	Sudeep Holla <sudeep.holla@....com>
Cc:	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 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.

> +       depends on IA64 || X86
> +
>  config ACPI_PROCESSOR_IDLE
>         bool
>         select CPU_IDLE