linux-kernel - Re: [PATCH 2/5] ARM: add SMP support for Broadcom mobile SoCs

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Date:	Fri, 04 Apr 2014 10:55:40 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Alex Elder <elder@...aro.org>, mporter@...aro.org,
	bcm@...thebug.org, devicetree@...r.kernel.org, arnd@...db.de
CC:	bcm-kernel-feedback-list@...adcom.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] ARM: add SMP support for Broadcom mobile SoCs

On 04/03/14 19:18, Alex Elder wrote:
> +
> +/*
> + * Secondary startup method setup routine to extract the location of
> + * the secondary boot register from a "cpu" or "cpus" device tree
> + * node.  Only the first seen secondary boot register value is used;
> + * any others are ignored.  The secondary boot register value must be
> + * non-zero.
> + *
> + * Returns 0 if successful or an error code otherwise.
> + */
> +static int __init of_enable_method_setup(struct device_node *node)
> +{
> +	int ret;
> +
> +	/* Ignore all but the first one specified */
> +	if (secondary_boot)
> +		return 0;
> +
> +	ret = of_property_read_u32(node, OF_SECONDARY_BOOT, &secondary_boot);
> +	if (ret)
> +		pr_err("%s: missing/invalid " OF_SECONDARY_BOOT " property\n",
> +			node->name);
> +
> +	return ret;
> +}

I don't understand why we need this. Why can't we get the secondary boot
address from the /cpus node in the smp_prepare_cpus op. It isn't that
hard to get access to the cpus node there via of_find_node_by_path().
Then we don't need patch 1 at all. If it turns out to be common stuff,
we can always have the common function live in arm common code or maybe
even be a devicetree API.

-- 
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hosted by The Linux Foundation

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