linux-kernel - Re: [PATCH v3 3/5] ARM: mediatek: add smp bringup code

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Date:	Wed, 5 Aug 2015 23:26:46 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	Olof Johansson <olof@...om.net>, srv_heupstream@...iatek.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/5] ARM: mediatek: add smp bringup code

On Tue, Jul 14, 2015 at 01:18:29PM +0800, Yingjoe Chen wrote:
> +static void __init __mtk_smp_prepare_cpus(unsigned int max_cpus, int trustzone)
> +{
> +	int i, num;
> +	const struct of_device_id *infos;
> +
> +	if (trustzone) {
> +		num = ARRAY_SIZE(mtk_tz_smp_boot_infos);
> +		infos = mtk_tz_smp_boot_infos;
> +	} else {
> +		num = ARRAY_SIZE(mtk_smp_boot_infos);
> +		infos = mtk_smp_boot_infos;
> +	}
> +
> +	/* Find smp boot info for this SoC */
> +	for (i = 0; i < num; i++) {
> +		if (of_machine_is_compatible(infos[i].compatible)) {
> +			mtk_smp_info = infos[i].data;
> +			break;
> +		}
> +	}
> +
> +	if (!mtk_smp_info) {
> +		pr_err("%s: Device is not supported\n", __func__);
> +		return;
> +	}
> +
> +	if (trustzone) {
> +		if (memblock_reserve(mtk_smp_info->smp_base, MTK_SMP_REG_SIZE)) {

Strong NAK.

This is _FAR_ too late to be calling memblock_reserve().  You won't be
reserving memory as you think you are (it's already handed over to the
kernel's allocators by this stage.)

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