From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [patch v3 21/36] Hexagon: Add SMP support
Date: Fri, 9 Sep 2011 15:24:54 +0200 (CEST)
Message-ID: <alpine.LFD.2.02.1109091517420.2723@ionos>
References: <20110909010847.294039464@codeaurora.org> <20110909010916.709728186@codeaurora.org>
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To: Richard Kuo <rkuo@codeaurora.org>
Cc: linux-arch@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, Linas Vepstas <linas@codeaurora.org>

On Thu, 8 Sep 2011, Richard Kuo wrote:

> +	/*  Set the memory struct  */
> +	atomic_inc(&init_mm.mm_count);
> +	current->active_mm = &init_mm;
> +
> +	cpu = smp_processor_id();
> +
> +	setup_irq(BASE_IPI_IRQ + cpu, &ipi_intdesc);
> +
> +	/*  Register the clock_event dummy  */
> +	setup_percpu_clockdev();
> +
> +	printk(KERN_INFO "%s cpu %d\n", __func__, current_thread_info()->cpu);
> +
> +	local_irq_enable();
> +	set_cpu_online(cpu, true);

This wants to be:

     	set_cpu_online(cpu, true);
        while (!cpumask_test_cpu(cpu, cpu_active_mask))
                cpu_relax();
	local_irq_enable();

See x86/kernel/smpboot.c and 
http://lists.arm.linux.org.uk/lurker/message/20110908.215756.a2ffbe5f.en.html

Thanks,

	tglx