linux-kernel - Re: [PATCH 7/7] ACPI: use Linux as ACPI_OS_NAME for

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Date:	Fri, 23 Jan 2015 16:55:43 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	al.stone@...aro.org
Cc:	tony.luck@...el.com, fenghua.yu@...el.com, catalin.marinas@....com,
	will.deacon@....com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, lenb@...nel.org, robert.moore@...el.com,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devel@...ica.org, linaro-acpi@...ts.linaro.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org
Subject: Re: [PATCH 7/7] ACPI: use Linux as ACPI_OS_NAME for _OS on ARM64

On Thursday, January 22, 2015 05:44:44 PM al.stone@...aro.org wrote:
> From: Hanjun Guo <hanjun.guo@...aro.org>
> 
> ACPI_OS_NAME is globally defined as "Microsoft Windows NT" for now.
> That doesn't make much sense in the ARM context, so set it to "Linux"
> when CONFIG_ARM64.
> 
> If it is necessary to change the return value from \_OS_ (that is, return
> some value other than the default in ACPI_OS_NAME), use the kernel parameter
> "acpi_os_name=<string>".
> 
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
>  arch/arm64/Kconfig              | 1 +
>  drivers/acpi/Kconfig            | 8 ++++++++
>  include/acpi/acconfig.h         | 2 ++
>  include/acpi/platform/aclinux.h | 4 ++++
>  4 files changed, 15 insertions(+)
> 
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index 915aa16..20677d1 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -1,5 +1,6 @@

If you added

	config ACPI_OS_NAME
		string
		default "Linux"
		depends on ACPI

to this file, then you don't need to add the new select below and ->

>  config ARM64
>  	def_bool y
> +	select ACPI_OS_NAME_LINUX if ACPI
>  	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
>  	select ARCH_BINFMT_ELF_RANDOMIZE_PIE
>  	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 3e3bd35..024c5f0 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -369,6 +369,14 @@ config ACPI_REDUCED_HARDWARE_ONLY
>  
>  	  If you are unsure what to do, do not enable this option.
>  
> +config ACPI_OS_NAME_LINUX
> +	bool "Using Linux for _OS method" if EXPERT
> +	def_bool n
> +	  When used, this option makes sure the _OS method returns
> +	  the value "Linux".
> +
> +	  If you are unsure what to do, do not enable this option.
> +

-> you don't need this at all ->>

>  source "drivers/acpi/apei/Kconfig"
>  
>  config ACPI_EXTLOG
> diff --git a/include/acpi/acconfig.h b/include/acpi/acconfig.h
> index 5a0a3e5..1980bf4 100644
> --- a/include/acpi/acconfig.h
> +++ b/include/acpi/acconfig.h
> @@ -69,7 +69,9 @@
>   * code that will not execute the _OSI method unless _OS matches the string
>   * below.  Therefore, change this string at your own risk.
>   */
> +#ifndef ACPI_OS_NAME
>  #define ACPI_OS_NAME                    "Microsoft Windows NT"
> +#endif
>  
>  /* Maximum objects in the various object caches */
>  
> diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
> index 1ba7c19..a8a7ee3 100644
> --- a/include/acpi/platform/aclinux.h
> +++ b/include/acpi/platform/aclinux.h
> @@ -69,6 +69,10 @@
>  #define ACPI_REDUCED_HARDWARE 1
>  #endif
>  
> +#ifdef CONFIG_ACPI_OS_NAME_LINUX
> +#define ACPI_OS_NAME "Linux"
> +#endif

->> and here you can do

+#ifdef CONFIG_ACPI_OS_NAME
+#define ACPI_OS_NAME CONFIG_ACPI_OS_NAME
+#endif

unless I'm missing something.

> +
>  #include <linux/string.h>
>  #include <linux/kernel.h>
>  #include <linux/ctype.h>
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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