linux-kernel - Re: [PATCH 3/8] ARM: VExpress: Switch to generic SCU routines

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Date:	Tue, 30 Nov 2010 23:27:23 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Anton Vorontsov <avorontsov@...sta.com>
Cc:	Kukjin Kim <kgene.kim@...sung.com>,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>,
	Tony Lindgren <tony@...mide.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Jamie Iles <jamie.iles@...ochip.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	Colin Cross <ccross@...roid.com>, linux-tegra@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/8] ARM: VExpress: Switch to generic SCU routines

On Tue, Nov 30, 2010 at 08:17:01PM +0300, Anton Vorontsov wrote:
> +/* If there are more than one CPU let them know where to start. */
> +static void __init smp_point_cpus(void)
> +{
> +	if (num_present_cpus() <= 1)
> +		return;
>  
> -	for (i = 0; i < ncores; i++)
> -		set_cpu_possible(i, true);
> +	writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
> +	writel(BSYM(virt_to_phys(scu_secondary_startup)),
> +	       MMIO_P2V(V2M_SYS_FLAGSSET));
>  }

I don't see the point of separating this code from the code below.  It
doesn't seem to bring any benefit.  Could you explain why it's necessary
to separate this?

>  void __init smp_prepare_cpus(unsigned int max_cpus)
>  {
...
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