linux-kernel - Re: [PATCH v9 14/21] ACPI / processor: Make it possible to get CPU hardware ID via GICC

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Message-ID: <20150305151915.GB11447@e104818-lin.cambridge.arm.com>
Date:	Thu, 5 Mar 2015 15:19:15 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	"Rafael J. Wysocki" <rafael@...nel.org>
Cc:	Mark Rutland <mark.rutland@....com>,
	"linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>,
	Will Deacon <will.deacon@....com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Timur Tabi <timur@...eaurora.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Robert Richter <rric@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Marc Zyngier <marc.zyngier@....com>,
	Jon Masters <jcm@...hat.com>, Mark Brown <broonie@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	suravee.suthikulpanit@....com, Sudeep Holla <Sudeep.Holla@....com>,
	Olof Johansson <olof@...om.net>
Subject: Re: [PATCH v9 14/21] ACPI / processor: Make it possible to get CPU
 hardware ID via GICC

On Thu, Mar 05, 2015 at 02:13:58PM +0100, Rafael J. Wysocki wrote:
> On Thu, Mar 5, 2015 at 12:27 PM, Catalin Marinas
> <catalin.marinas@....com> wrote:
> > On Thu, Mar 05, 2015 at 04:03:21PM +0800, Hanjun Guo wrote:
> >> On 2015/3/5 6:46, Rafael J. Wysocki wrote:
> >> > IMO, you really need to define phys_cpuid_t in a common place or people will
> >> > forget that it may be 64-bit, because they'll only be looking at their arch.
> >>
> >> Since x86 and ARM64 are using different types for phys_cpuid_t, we need to
> >> introduce something like following if define it in common place:
> >>
> >> in linux/acpi.h,
> >>
> >> #if defined(CONFIG_X86) || defined(CONFIG_IA64)
> >> typedef u32 phys_cpuid_t;
> >> #define PHYS_CPUID_INVALID (phys_cpuid_t)(-1)
> >> #else if defined(CONFIG_ARM64)
> >> typedef u64 phys_cpuid_t;
> >> #define PHYS_CPUID_INVALID INVALID_HWID
> >> #endif
> >>
> >> I think it's awful, did I miss something?
> 
> Well, you can define the type and PHYS_CPUID_INVALID in the arch
> code and then do this in a common header:
> 
> #ifndef PHYS_CPUID_INVALID
> typedef u32 phys_cpuid_t;
> #define PHYS_CPUID_INVALID (phys_cpuid_t)(-1)
> #endif
> 
> That would allow you to avoid the need to duplicate the
> definitions where it is not necessary.

It's fine by me.

-- 
Catalin
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