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:	Fri, 6 Dec 2013 00:09:54 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Rob Herring <robherring2@...il.com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	Linaro Patches <patches@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Will Deacon <will.deacon@....com>,
	linaro-acpi@...ts.linaro.org, linux-acpi@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Olof Johansson <olof@...om.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Grant Likely <grant.likely@...aro.org>
Subject: Re: [RFC part2 PATCH 2/9] ARM64 / ACPI: Prefill cpu possible/present maps and map logical cpu id to APIC id

On Wednesday 04 December 2013, Rob Herring wrote:
> > 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
> 
> Should this be moved to DT cpu topology related code?

More importantly, the #ifndef is certainly wrong here: It is important that you can
turn CONFIG_ACPI on or off without impacting the run-time code path for non-ACPI
systems. The snippet above breaks this because we no longer set the
cpu mask when ACPI is turned on but not used.

	Arnd
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