linux-kernel - Re: [PATCH 1/4] ARM: tegra: Unify tegra{20,30,114}_init

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Date:	Fri, 08 Feb 2013 10:09:10 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Marc Dietrich <marvin24@....de>
CC:	Hiroshi Doyu <hdoyu@...dia.com>, linux-tegra@...r.kernel.org,
	arnd@...db.de, Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] ARM: tegra: Unify tegra{20,30,114}_init_early()

On 02/08/2013 05:29 AM, Marc Dietrich wrote:
> Hiroshi,
> 
> Am Freitag, 8. Februar 2013, 09:29:31 schrieb Hiroshi Doyu:
>> Refactored tegra{20,30,114}_init_early() so that we have the unified
>> tegra_init_early().

>> diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c

>> +void __init tegra_hotplug_init(void)
>>  {
>> +	switch (tegra_chip_id) {
>> +#ifdef CONFIG_ARCH_TEGRA_2x_SOC
>> +	case TEGRA20:
>> +		tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
>> +		break;
>>  #endif
>> +#if defined(CONFIG_ARCH_TEGRA_3x_SOC)
>> +	case TEGRA30:
>> +		tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
>> +		break;
>>  #endif
>> +	default:
>> +		BUG_ON(IS_ENABLED(CONFIG_HOTPLUG_CPU));
>> +		break;
>> +	}
>> +}
> 
> are these ifdefs really needed? Multisoc kernels will enable them all anyway 
> and there is a case structure which protects the assignments. Also the hotplug 
> functions are very tiny, so there shouldn't be a big loss.

The files that contain/implement those functions are separate for each
SoC and only included in the build when the individual SoCs are enabled.

While multi-platform SoCs do make sense for distros, we also very
specifically want to support the case where only Tegra, and only a
single Tegra SoC, is enabled, hence this separation.

(and Tegra doesn't support multi-platform yet; maybe in another kernel
release or two)

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