linux-kernel - Re: [patch v11 13/23] ACPI / processor: Introduce phys_cpuid

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Date:	Thu, 26 Mar 2015 11:49:33 +0800
From:	Hanjun Guo <guohanjun@...wei.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Hanjun Guo <hanjun.guo@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Robert Richter <rric@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	<linaro-acpi@...ts.linaro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Timur Tabi <timur@...eaurora.org>,
	Mark Salter <msalter@...hat.com>,
	Will Deacon <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	"Grant Likely" <grant.likely@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	"Suravee Suthikulpanit" <suravee.suthikulpanit@....com>,
	Jon Masters <jcm@...hat.com>, Olof Johansson <olof@...om.net>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	<linux-acpi@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [patch v11 13/23] ACPI / processor: Introduce phys_cpuid_t for
 CPU hardware ID

On 2015/3/26 1:21, Catalin Marinas wrote:
> On Tue, Mar 24, 2015 at 10:02:46PM +0800, Hanjun Guo wrote:
>> CPU hardware ID (phys_id) is defined as u32 in structure acpi_processor,
>> but phys_id is used as int in acpi processor driver, so it will lead to
>> some inconsistence for the drivers.
>>
>> Furthermore, to cater for ACPI arch ports that implement 64 bits CPU
>> ids a generic CPU physical id type is required.
>>
>> So introduce typedef u32 phys_cpuid_t in a common file, and introduce
>> a macro PHYS_CPUID_INVALID as (phys_cpuid_t)(-1) if it's not defined
>> by other archs, this will solve the inconsistence in acpi processor driver,
>> and will prepare for the ACPI on ARM64 for the 64 bit CPU hardware ID
>> in the following patch.
>>
>> CC: Rafael J Wysocki <rjw@...ysocki.net>
>> Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>> Reviewed-by: Grant Likely <grant.likely@...aro.org>
>> Acked-by: Sudeep Holla <sudeep.holla@....com>
>> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
>> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>> Signed-off-by: Catalin Marinas <catalin.marinas@....com>
>> [hj: reworked cpu physid map return codes]
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> BTW, am I still the author of this patch? If yes, it's missing a From:
> line.

Oops, you should be the author, can Will fix this in his tree?

>
>> --- a/drivers/acpi/acpi_processor.c
>> +++ b/drivers/acpi/acpi_processor.c
>> @@ -170,7 +170,7 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
>>  	acpi_status status;
>>  	int ret;
>>  
>> -	if (pr->phys_id == -1)
>> +	if (pr->phys_id == PHYS_CPUID_INVALID)
>>  		return -ENODEV;
> If PHYS_CPUID_INVALID is the same as INVALID_HWID, we should get rid of
> the latter in the arm64 code (as a subsequent clean-up patch).

OK, I'm preparing a patch set to introduce invalid_phys_cpuid() and invalid_logical_cpuid()
to remove the direct comparison of PHYS_CPUID_INVALID and -1 in ACPI processor drivers,
which is suggested by Rafael, I will cleanup PHYS_CPUID_INVALID in this patch set.

Thanks
Hanjun
>


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