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

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Date:	Fri, 23 Jan 2015 09:34:50 -0700
From:	Al Stone <ahs3@...hat.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>, 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 01/23/2015 08:55 AM, Rafael J. Wysocki wrote:
> 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>
>>
> 

D'oh.  Yup.  I'll correct it.

-- 
ciao,
al
-----------------------------------
Al Stone
Software Engineer
Red Hat, Inc.
ahs3@...hat.com
-----------------------------------
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