linux-kernel - Re: [PATCH 2/8] ARM: cns3xxx: Add support for SMP

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Date:	Tue, 30 Nov 2010 18:14:42 +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 2/8] ARM: cns3xxx: Add support for SMP

On Tue, Nov 30, 2010 at 08:17:00PM +0300, Anton Vorontsov wrote:
> Nothing fancy needs to be done, just use generic SCU routines.
> 
> Signed-off-by: Anton Vorontsov <avorontsov@...sta.com>

This I assume is an age old patch.

> diff --git a/arch/arm/mach-cns3xxx/include/mach/smp.h b/arch/arm/mach-cns3xxx/include/mach/smp.h
> new file mode 100644
> index 0000000..44aa7ea
> --- /dev/null
> +++ b/arch/arm/mach-cns3xxx/include/mach/smp.h
> @@ -0,0 +1,28 @@
> +/*
> + * Copyright 2002 ARM Ltd.
> + * Copyright 2008 Cavium Networks
> + *
> + * This file is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License, Version 2, as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef __MACH_SMP_H
> +#define __MACH_SMP_H
> +
> +#include <asm/hardware/gic.h>
> +
> +#define hard_smp_processor_id()				\
> +	({						\
> +		unsigned int cpunum;			\
> +		__asm__("mrc p15, 0, %0, c0, c0, 5"	\
> +			: "=r" (cpunum));		\
> +		cpunum &= 0x0F;				\
> +	})

#include <asm/smp_mpidr.h>

replaces this, but it's not actually necessary - it's only used by some
bug checking code in the CPU hotplug code.  I'm shortly going to be
deleting all hard_smp_processor_id() implementations.
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