linux-kernel - Re: [PATCH] arm: platsmp: Allow secondary cpu hotplug with maxcpus=1

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Message-ID: <20110630131154.GJ23312@n2100.arm.linux.org.uk>
Date:	Thu, 30 Jun 2011 14:11:54 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-tegra@...r.kernel.org,
	Kukjin Kim <kgene.kim@...sung.com>,
	David Brown <davidb@...eaurora.org>,
	Tony Lindgren <tony@...mide.com>,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: Re: [PATCH] arm: platsmp: Allow secondary cpu hotplug with
	maxcpus=1

On Wed, Jun 29, 2011 at 11:31:39AM -0700, Stephen Boyd wrote:
>  void __init platform_smp_prepare_cpus(unsigned int max_cpus)
>  {
> -	int i;
> -
>  	/*
>  	 * Initialise the present map, which describes the set of CPUs
>  	 * actually populated at the present time.
>  	 */
> -	for (i = 0; i < max_cpus; i++)
> -		set_cpu_present(i, true);
> +	init_cpu_present(&cpu_possible_map);

Ok, if we're now doing this in every platform, it might as well go into
arch/arm/kernel/smp.c - platforms can re-initialize the present map
in this callback if they need to do something different.
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