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

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Date:	Mon, 30 Mar 2015 14:58:10 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	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>,
	Jon Masters <jcm@...hat.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>,
	Olof Johansson <olof@...om.net>,
	Mark Brown <broonie@...nel.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Grant Likely <grant.likely@...aro.org>,
	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 Fri, Mar 27, 2015 at 09:40:26PM +0800, Hanjun Guo wrote:
> On 2015年03月26日 11:49, Hanjun Guo wrote:
> >On 2015/3/26 1:21, Catalin Marinas wrote:
> >>On Tue, Mar 24, 2015 at 10:02:46PM +0800, Hanjun Guo wrote:
> >>>--- 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.
> 
> I met difficulty to do so, because we use
> 
> +#ifndef PHYS_CPUID_INVALID
> +typedef u32 phys_cpuid_t;
> +#define PHYS_CPUID_INVALID (phys_cpuid_t)(-1)
> +#endif
> 
> in the common head file linux/acpi.h, we need macro
> PHYS_CPUID_INVALID to identify if phys_cpuid_t is typedefed
> for different arch, so if we want remove PHYS_CPUID_INVALID
> for ARM64, we need to got back to typedef phys_cpuid_t for
> each arch using ACPI. which means that

What I meant was removing INVALID_HWID from arm64 and always use the
PHYS_CPUID_INVALID but I think we should leave them as they are for now
since PHYS_CPUID_INVALID is defined in the asm/acpi.h file.

-- 
Catalin
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