linux-kernel - Re: [PATCH v2 09/18] ACPI / processor: Make it possible to get CPU hardware ID via GICC

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Message-ID: <53F33501.2060009@linaro.org>
Date:	Tue, 19 Aug 2014 19:29:05 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Sudeep Holla <sudeep.holla@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <Mark.Rutland@....com>
CC:	"graeme.gregory@...aro.org" <graeme.gregory@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	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>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....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>
Subject: Re: [PATCH v2 09/18] ACPI / processor: Make it possible to get CPU
 hardware ID via GICC

On 2014-8-19 2:34, Sudeep Holla wrote:
[...]
>>
>> +#include <asm/smp_plat.h>
>> +
>>   /* Basic configuration for ACPI */
>>   #ifdef    CONFIG_ACPI
>>   /*
>> @@ -59,6 +61,18 @@ static inline void disable_acpi(void)
>>       acpi_noirq = 1;
>>   }
>>
>> +u32 pack_mpidr_into_32_bits(u64 mpidr);
>> +
>> +/*
>> + * The ACPI processor driver for ACPI core code needs this macro
>> + * to find out this cpu was already mapped (mapping from CPU hardware
>> + * ID to CPU logical ID) or not.
>> + *
>> + * cpu_logical_map(cpu) is the mapping of MPIDR and the logical cpu,
>> + * and MPIDR is the cpu hardware ID we needed.
> 
> You need to specify this is packed version of cpu_logical_map or
> better is to move pack_mpidr_into_32_bits here along with the
> description you have so that it's easy to understand.

Agreed, I will make pack_mpidr_into_32_bits() as inline function here and
specify that it is the packed version we needed.

Thanks
Hanjun

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