linux-kernel - Re: [PATCH v2 1/3] ACPI : introduce macros for using the ACPI specification version

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Date:	Fri, 19 Jun 2015 14:01:45 -0600
From:	Al Stone <ahs3@...hat.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>, Al Stone <al.stone@...aro.org>,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
CC:	rjw@...ysocki.net, lenb@...nel.org, catalin.marinas@....com,
	will.deacon@....com, tglx@...utronix.de, jason@...edaemon.net,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	linaro-kernel@...ts.linaro.org, patches@...aro.org
Subject: Re: [PATCH v2 1/3] ACPI : introduce macros for using the ACPI specification
 version

On 06/19/2015 04:49 AM, Hanjun Guo wrote:
> On 06/19/2015 06:36 AM, Al Stone wrote:
>> Add the ACPI_SPEC_VERSION() macro to build a proper version number from
>> a major and minor revision number.  Add also the ACPI_FADT_SPEC_VERSION
>> that constructs a proper version number from the entries in the current
>> FADT.
>>
>> These macros are added in order to simplify retrieving and comparing ACPI
>> specification version numbers, since this is becoming a more frequent need.
>> In particular, there are some architectures that require at least a certain
>> version of the spec, and there are differences in some structure sizes that
>> have changed with recent versions but can only be tracked by spec version
>> number.
>>
>> Signed-off-by: Al Stone <al.stone@...aro.org>
>> ---
>>   include/linux/acpi.h | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
>> index a4acb55..33ed313 100644
>> --- a/include/linux/acpi.h
>> +++ b/include/linux/acpi.h
>> @@ -48,6 +48,11 @@
>>   #include <acpi/acpi_io.h>
>>   #include <asm/acpi.h>
>>
>> +#define ACPI_SPEC_VERSION(major, minor)    ((major<<8)|minor)
> 
> and minor comments for code style
> 
> ((major<<8)|minor) - > ((major << 8) | minor)

Ah.  Yeah, good idea.  I can roll that into next version.

> other than that:
> 
> Reviewed-by: Hanjun Guo <hanjun.guo@...aro.org>

Thanks.

> Thanks
> Hanjun
> 
>> +#define ACPI_FADT_SPEC_VERSION    \
>> +    ACPI_SPEC_VERSION(acpi_gbl_FADT.header.revision, \
>> +              acpi_gbl_FADT.minor_revision)
>> +
>>   static inline acpi_handle acpi_device_handle(struct acpi_device *adev)
>>   {
>>       return adev ? adev->handle : NULL;
>>
> -- 
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-- 
ciao,
al
-----------------------------------
Al Stone
Software Engineer
Red Hat, Inc.
ahs3@...hat.com
-----------------------------------
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