linux-kernel - Re: [PATCH v3 16/17] ARM64 / ACPI: Enable ARM64 in Kconfig

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Message-ID: <20140911151835.GA28298@e102568-lin.cambridge.arm.com>
Date:	Thu, 11 Sep 2014 16:18:35 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <Mark.Rutland@....com>,
	Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Will Deacon <Will.Deacon@....com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Lv Zheng <lv.zheng@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles Garcia-Tobin <Charles.Garcia-Tobin@....com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Al Stone <al.stone@...aro.org>
Subject: Re: [PATCH v3 16/17] ARM64 / ACPI: Enable ARM64 in Kconfig

On Mon, Sep 01, 2014 at 03:57:54PM +0100, Hanjun Guo wrote:
> From: Graeme Gregory <graeme.gregory@...aro.org>
> 
> Add Kconfigs to build ACPI on ARM64, and make ACPI available on ARM64.
> 
> acpi_idle driver is x86/IA64 dependent now, so make CONFIG_ACPI_PROCESSOR
> depend on X86 || IA64, and implement it on ARM64 in the future.

So are S states. Maybe I am being pedantic, but why can't you do
the same thing for drivers/acpi/sleep.c ? Is it really that complicated to add
a config option and avoid compiling it (that file supports a part
of the ACPI specs that is completely undefined for ARM64), and with that
removing the need for useless hooks on ARM64 ?

Why do we have to compile that code at all on ARM64 ?

Thanks,
Lorenzo

> Reviewed-by: Grant Likely <grant.likely@...aro.org>
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> Signed-off-by: Al Stone <al.stone@...aro.org>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
>  arch/arm64/Kconfig   |    2 ++
>  drivers/acpi/Kconfig |    6 +++---
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 065438c..8dabaeb 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -422,6 +422,8 @@ source "drivers/Kconfig"
>  
>  source "drivers/firmware/Kconfig"
>  
> +source "drivers/acpi/Kconfig"
> +
>  source "fs/Kconfig"
>  
>  source "arch/arm64/kvm/Kconfig"
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index d0f3265..f935d2e 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -5,8 +5,7 @@
>  menuconfig ACPI
>  	bool "ACPI (Advanced Configuration and Power Interface) Support"
>  	depends on !IA64_HP_SIM
> -	depends on IA64 || X86
> -	depends on PCI
> +	depends on ((IA64 || X86) && PCI) || (ARM64 && EXPERT)
>  	select PNP
>  	default y
>  	help
> @@ -163,6 +162,7 @@ config ACPI_PROCESSOR
>  	tristate "Processor"
>  	select THERMAL
>  	select CPU_IDLE
> +	depends on X86 || IA64
>  	default y
>  	help
>  	  This driver installs ACPI as the idle handler for Linux and uses
> @@ -263,7 +263,7 @@ config ACPI_DEBUG
>  
>  config ACPI_PCI_SLOT
>  	bool "PCI slot detection driver"
> -	depends on SYSFS
> +	depends on SYSFS && PCI
>  	default n
>  	help
>  	  This driver creates entries in /sys/bus/pci/slots/ for all PCI
> -- 
> 1.7.9.5
> 
> 

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