linux-kernel - Re: [PATCH v3] [RFC] arm: use PSCI if available

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Message-ID: <51531C50.1010106@gmail.com>
Date:	Wed, 27 Mar 2013 11:20:32 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"arnd@...db.de" <arnd@...db.de>,
	"nico@...aro.org" <nico@...aro.org>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v3] [RFC] arm: use PSCI if available

On 03/27/2013 08:35 AM, Marc Zyngier wrote:
> On 27/03/13 12:50, Stefano Stabellini wrote:
>> Check for the presence of PSCI before setting smp_ops, use PSCI if it is
>> available.
>>
>> This is useful because at least when running on Xen it's possible to have a
>> PSCI node for example on a Versatile Express or an Exynos5 machine. In these
>> cases the PSCI SMP calls should be the ones to be called.
>>
>> Remove virt_smp_ops and platsmp.c from mach-virt because they aren't needed
>> anymore.

[...]

>> +static void __cpuinit psci_secondary_init(unsigned int cpu)
>> +{
>> +	gic_secondary_init(0);
>> +}
> 
> So here we end-up with a dependency between SMP, PSCI, and GIC.
> I really can't see that being a good idea, even I like the general
> direction of this series.
> 

The GIC dependency should be removed with Catalin's series to use
notifiers for GIC cpu interface init.

Rob
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