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:	Tue, 10 Dec 2013 23:07:18 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Grant Likely <grant.likely@...aro.org>
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>,
	Mark Rutland <mark.rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	linaro-kernel@...ts.linaro.org, linux-acpi@...r.kernel.org,
	patches@...aro.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	linaro-acpi@...ts.linaro.org, Olof Johansson <olof@...om.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-arm-kernel@...ts.infradead.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10日 20:53, Grant Likely wrote:
> On Mon,  2 Dec 2013 23:44:47 +0800, Hanjun Guo <hanjun.guo@...aro.org> wrote:
>> When boot the kernel with MADT, the cpu possible and present maps should be
>> prefilled for cpu topology and acpi based cpu hot-plug.
>>
>> The logic cpu id maps to APIC id (GIC id) is also implemented, it is needed
>> for acpi processor drivers.
>>
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> ---
> [...]
>> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
>> index a0c2ca6..1428024 100644
>> --- a/arch/arm64/kernel/smp.c
>> +++ b/arch/arm64/kernel/smp.c
>> @@ -420,7 +420,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
>>   		if (err)
>>   			continue;
>>   
>> +#ifndef CONFIG_ACPI
>>   		set_cpu_present(cpu, true);
>> +#endif
>>   		max_cpus--;
>>   	}
>>   }
> This looks wrong. Will this break non-ACPI booting when CONFIG_ACPI is
> enabled? The decision on whether or not to run code must be made at
> runtime.

Yes, you are right. I'm reworking on this patch now.

Thanks
Hanjun
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