linux-kernel - Re: [PATCH -v8 11/11] Move arch/x86 reboot= handling to generic kernel.

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Message-ID: <20130509133643.GU18614@n2100.arm.linux.org.uk>
Date:	Thu, 9 May 2013 14:36:43 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Robin Holt <holt@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Guan Xuetao <gxt@...c.pku.edu.cn>, Russ Anderson <rja@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Arm Mailing List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH -v8 11/11] Move arch/x86 reboot= handling to generic
	kernel.

On Thu, May 09, 2013 at 08:01:20AM -0500, Robin Holt wrote:
> diff --git a/include/linux/reboot.h b/include/linux/reboot.h
> index 26cf11b..bc77231 100644
> --- a/include/linux/reboot.h
> +++ b/include/linux/reboot.h
> @@ -15,6 +15,23 @@ enum reboot_mode {
> +extern enum reboot_type reboot_type;
> +
> +extern int reboot_default;
> +extern int reboot_cpu;
> +extern int reboot_force;

Okay, these are globals...

> diff --git a/kernel/reboot.c b/kernel/reboot.c
> index 0a97794..ff08af2 100644
> --- a/kernel/reboot.c
> +++ b/kernel/reboot.c
> @@ -87,7 +88,7 @@ EXPORT_SYMBOL(unregister_reboot_notifier);
>  static void migrate_to_reboot_cpu(void)
>  {
>  	/* The boot cpu is always logical cpu 0 */
> -	int reboot_cpu = 0;
> +	int reboot_cpu = reboot_cpu;

Hmm, are you sure about that?

> @@ -343,3 +344,80 @@ int orderly_poweroff(bool force)
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(orderly_poweroff);
> +
> +int reboot_default;
> +enum reboot_mode reboot_mode = REBOOT_COLD;
> +int reboot_cpu;
> +enum reboot_type reboot_type = BOOT_ACPI;
> +int reboot_force;

As you seem to want to reference these above, wouldn't it make sense to
move them higher in the file?

> +		case 'c':
> +		case 'h':
> +			reboot_mode = REBOOT_COLD;
> +			break;

I'm still not entirely convinced by making "hard" and "cold" mean the
same thing, likewise "soft" and "warm".  As I previously explained but
everyone seems to have ignored, solely focusing on the 's' problem
instead.
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