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

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Message-ID: <20120905005134.GM2362@S2101-09.ap.freescale.net>
Date:	Wed, 5 Sep 2012 08:51:36 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Andrew Morton <akpm@...ux-foundation.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 Tue, Sep 04, 2012 at 03:36:24PM -0700, Andrew Morton wrote:
> 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?
> 
Yes, it fixes one reboot issue seen on imx6q (Cortex-A9 Quad).  The
machine requires the restart routine run on primary cpu than secondary
ones.  Otherwise, the secondary core running restart routine will fail
to come to online after reboot.

-- 
Regards,
Shawn
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