linux-kernel - Re: [PATCH v5 1/3] arm: introduce psci_smp

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Message-ID: <alpine.LFD.2.03.1304021336270.1171@syhkavp.arg>
Date:	Tue, 2 Apr 2013 13:41:17 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
cc:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, will.deacon@....com,
	arnd@...db.de, rob.herring@...xeda.com, marc.zyngier@....com,
	linux@....linux.org.uk
Subject: Re: [PATCH v5 1/3] arm: introduce psci_smp_ops

On Tue, 2 Apr 2013, Stefano Stabellini wrote:

> Rename virt_smp_ops to psci_smp_ops and move them to arch/arm/kernel/psci_smp.c.
> Remove mach-virt/platsmp.c, now unused.
> Compile psci_smp if CONFIG_ARM_PSCI and CONFIG_SMP.
> 
> Add a cpu_die smp_op based on psci_ops.cpu_off.
> 
> Initialize PSCI before setting smp_ops in setup_arch.
> Use psci_smp_ops if the platform doesn't provide its own smp_ops.

[...]

> @@ -766,9 +767,13 @@ void __init setup_arch(char **cmdline_p)
>  	unflatten_device_tree();
>  
>  	arm_dt_init_cpu_maps();
> +	psci_init();
>  #ifdef CONFIG_SMP
>  	if (is_smp()) {
> -		smp_set_ops(mdesc->smp);
> +		if (mdesc->smp)
> +			smp_set_ops(mdesc->smp);
> +		else if (psci_smp_available())
> +			smp_set_ops(&psci_smp_ops);

Didn't we agree to do this the other way around, i.e. 

	if (psci_smp_available())
		smp_set_ops(&psci_smp_ops);
	else if (mdesc->smp)
		smp_set_ops(mdesc->smp);

?

This way you won't need the ->smp_init for Xen and that won't conflict 
with MCPM.


Nicolas
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