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

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Date:	Fri, 08 Feb 2013 13:29:14 +0100
From:	Marc Dietrich <marvin24@....de>
To:	Hiroshi Doyu <hdoyu@...dia.com>
Cc:	linux-tegra@...r.kernel.org, arnd@...db.de,
	Stephen Warren <swarren@...dotorg.org>,
	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()

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().
> 
> Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>

[...]

> diff --git a/arch/arm/mach-tegra/hotplug.c b/arch/arm/mach-tegra/hotplug.c
> index a599f6e..9bcecb8 100644
> --- a/arch/arm/mach-tegra/hotplug.c
> +++ b/arch/arm/mach-tegra/hotplug.c
> @@ -1,8 +1,7 @@
>  /*
> - *
>   *  Copyright (C) 2002 ARM Ltd.
>   *  All Rights Reserved
> - *  Copyright (c) 2010, 2012 NVIDIA Corporation. All rights reserved.
> + *  Copyright (c) 2010, 2012-2013, NVIDIA Corporation. All rights reserved.
> *
>   * This program is free software; you can redistribute it and/or modify
>   * it under the terms of the GNU General Public License version 2 as
> @@ -15,6 +14,7 @@
>  #include <asm/cacheflush.h>
>  #include <asm/smp_plat.h>
> 
> +#include "fuse.h"
>  #include "sleep.h"
> 
>  static void (*tegra_hotplug_shutdown)(void);
> @@ -56,18 +56,21 @@ int tegra_cpu_disable(unsigned int cpu)
>  	return cpu == 0 ? -EPERM : 0;
>  }
> 
> -#ifdef CONFIG_ARCH_TEGRA_2x_SOC
> -extern void tegra20_hotplug_shutdown(void);
> -void __init tegra20_hotplug_init(void)
> +void __init tegra_hotplug_init(void)
>  {
> -	tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
> -}
> +	switch (tegra_chip_id) {
> +#ifdef CONFIG_ARCH_TEGRA_2x_SOC
> +	case TEGRA20:
> +		tegra_hotplug_shutdown = tegra20_hotplug_shutdown;
> +		break;
>  #endif
> -
> -#ifdef CONFIG_ARCH_TEGRA_3x_SOC
> -extern void tegra30_hotplug_shutdown(void);
> -void __init tegra30_hotplug_init(void)
> -{
> -	tegra_hotplug_shutdown = tegra30_hotplug_shutdown;
> -}
> +#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.

Marc



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