Subject: [PATCH 09/13] arm64/kexec: Kexec expects cpu_die

From: [email-masked] (Mark Rutland)
Date: Mon, 15 Sep 2014 20:10:17 +0100

On Tue, Sep 09, 2014 at 11:49:05PM +0100, Geoff Levand wrote:
> The arm64 implementation of kexec expects an operational cpu_die method of
> struct cpu_operations, so add defined(CONFIG_KEXEC) to the preprocessor
> conditional that enables cpu_die.

I very much do not like this, as I explained in previous postings and my
comments on other patches in this series.

Please use the hotplug infrastructure, and have kexec depend on
CPU_HOTPLUG || !SMP.

There is no reason for these files to have any knowledge of kexec
whatsoever.

Thanks,
Mark

> 
> Signed-off-by: Geoff Levand <[email-masked]>
> ---
>  arch/arm64/include/asm/cpu_ops.h | 2 +-
>  arch/arm64/kernel/psci.c         | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h
> index d7b4b38..9fd7281 100644
> --- a/arch/arm64/include/asm/cpu_ops.h
> +++ b/arch/arm64/include/asm/cpu_ops.h
> @@ -50,7 +50,7 @@ struct cpu_operations {
>  	int		(*cpu_prepare)(unsigned int);
>  	int		(*cpu_boot)(unsigned int);
>  	void		(*cpu_postboot)(void);
> -#ifdef CONFIG_HOTPLUG_CPU
> +#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_KEXEC)
>  	int		(*cpu_disable)(unsigned int cpu);
>  	void		(*cpu_die)(unsigned int cpu);
>  	int		(*cpu_kill)(unsigned int cpu);
> diff --git a/arch/arm64/kernel/psci.c b/arch/arm64/kernel/psci.c
> index 5539547..81dbbc9 100644
> --- a/arch/arm64/kernel/psci.c
> +++ b/arch/arm64/kernel/psci.c
> @@ -380,7 +380,7 @@ static int cpu_psci_cpu_boot(unsigned int cpu)
>  	return err;
>  }
>  
> -#ifdef CONFIG_HOTPLUG_CPU
> +#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_KEXEC)
>  static int cpu_psci_cpu_disable(unsigned int cpu)
>  {
>  	/* Fail early if we don't have CPU_OFF support */
> @@ -442,7 +442,7 @@ const struct cpu_operations cpu_psci_ops = {
>  	.cpu_init	= cpu_psci_cpu_init,
>  	.cpu_prepare	= cpu_psci_cpu_prepare,
>  	.cpu_boot	= cpu_psci_cpu_boot,
> -#ifdef CONFIG_HOTPLUG_CPU
> +#if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_KEXEC)
>  	.cpu_disable	= cpu_psci_cpu_disable,
>  	.cpu_die	= cpu_psci_cpu_die,
>  	.cpu_kill	= cpu_psci_cpu_kill,
> -- 
> 1.9.1
> 
> 
> 
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