linux-kernel - Re: [PATCH] kernel/sys.c: call disable_nonboot_cpus in kernel

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Message-Id: <20120904153624.d4aaed4e.akpm@linux-foundation.org>
Date:	Tue, 4 Sep 2012 15:36:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Shawn Guo <shawn.guo@...aro.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] kernel/sys.c: call disable_nonboot_cpus in
 kernel_restart

On Mon,  3 Sep 2012 22:24:58 +0800
Shawn Guo <shawn.guo@...aro.org> wrote:

> Like kernel_power_off calls disable_nonboot_cpus, we may want to have
> kernel_restart call disable_nonboot_cpus as well.  Doing so can help
> the machines that require boot cpu be the last alive cpu during reboot
> to survive with kernel restart.

That does sound logical.  But the changelog is very vague and fluffy. 
Does this patch actually fix any known problem on any known machine?

> ...
> --- a/kernel/sys.c
> +++ b/kernel/sys.c
> @@ -368,6 +368,7 @@ EXPORT_SYMBOL(unregister_reboot_notifier);
>  void kernel_restart(char *cmd)
>  {
>  	kernel_restart_prepare(cmd);
> +	disable_nonboot_cpus();
>  	if (!cmd)
>  		printk(KERN_EMERG "Restarting system.\n");
>  	else

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