linux-kernel - Re: [RFC part2 PATCH 2/9] ARM64 / ACPI: Prefill cpu possible/present maps and map logical cpu id to APIC id

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Date:	Wed, 04 Dec 2013 22:21:11 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
CC:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Grant Likely <grant.likely@...aro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Olof Johansson <olof@...om.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Rutland <mark.rutland@....com>,
	Jon Masters <jonathan@...masters.org>, patches@...aro.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	linaro-acpi@...ts.linaro.org
Subject: Re: [RFC part2 PATCH 2/9] ARM64 / ACPI: Prefill cpu possible/present
 maps and map logical cpu id to APIC id

On 2013年12月04日 00:57, One Thousand Gnomes wrote:
>> diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
>> index 45ff625..8527ecc 100644
>> --- a/drivers/acpi/plat/arm-core.c
>> +++ b/drivers/acpi/plat/arm-core.c
>> @@ -58,6 +58,13 @@ EXPORT_SYMBOL(acpi_pci_disabled);
>>    */
>>   static u64 acpi_lapic_addr __initdata;
>>   
>> +/* available_cpus here means enabled cpu in MADT */
>> +int available_cpus;
>> +
>> +/* Map logic cpu id to physical GIC id. */
>> +int arm_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
>> +int boot_cpu_apic_id = -1;
>> +
> static ?
>
> Really shouldn't be leaking names like "available_cpus" out of ACPI into
> the global namespace

Ok, will update in next version.


>> +#ifdef CONFIG_SMP
>> +	if (available_cpus == 0) {
>> +		pr_info(PREFIX "Found 0 CPUs; assuming 1\n");
>> +		/* FIXME: should be the real GIC id read from hardware */
>> +		arm_cpu_to_apicid[available_cpus] = 0;
>> +		available_cpus = 1;	/* We've got at least one of these */
>> +	}
>> +#endif
> Isn't this true uniprocessor (by definition in fact)

This code is intend to handle some buggy firmware I think.


>> + */
>> +void __init prefill_possible_map(void)
> leaking more unprefixed names into the global namespace

prefill_possible_map() will be called in setup_arch() in setup.c,
and should be gloabl, is this incorrect?
Look forward to your advice

Thanks
Hanjun

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