linux-kernel - Re: [PATCH] disable non-boot CPUs before poweroff

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Date:	Fri, 28 Sep 2007 16:55:16 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Mark Lord <lkml@....ca>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	simon.derr@...l.net, Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] disable non-boot CPUs before poweroff


On Fri, 2007-09-28 at 09:52 -0400, Mark Lord wrote:
> We need to disable all CPUs other than the boot CPU (usually 0)
> before attempting to power-off modern SMP machines.
> This seems to fix the hang-on-poweroff issue
> that one of my SMP boxes exhibits.  More testing required.
> 
> Signed-off-by: Mark Lord <mlord@...ox.com>

Fixes my new toybox as well. Thanks for tracking it down before I had to
dig in.

Acked-by: Thomas Gleixner <tglx@...utronix.de>

> ---
> 
> --- linux/kernel/sys.c.orig	2007-09-13 09:49:11.000000000 -0400
> +++ linux/kernel/sys.c	2007-09-28 09:48:54.000000000 -0400
> @@ -32,6 +32,7 @@
>  #include <linux/getcpu.h>
>  #include <linux/task_io_accounting_ops.h>
>  #include <linux/seccomp.h>
> +#include <linux/cpu.h>
>  
>  #include <linux/compat.h>
>  #include <linux/syscalls.h>
> @@ -879,6 +880,7 @@
>  	if (pm_power_off_prepare)
>  		pm_power_off_prepare();
>  	sysdev_shutdown();
> +	disable_nonboot_cpus();
>  	printk(KERN_EMERG "Power down.\n");
>  	machine_power_off();
>  }
> -
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