linux-kernel - RE: Shutdown problem in SMP system happened on Tegra20

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Date:	Mon, 27 Aug 2012 13:43:07 +0800
From:	Bill Huang <bilhuang@...dia.com>
To:	'Russell King - ARM Linux' <linux@....linux.org.uk>
CC:	"'linux-tegra@...r.kernel.org'" <linux-tegra@...r.kernel.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: Shutdown problem in SMP system happened on Tegra20

> On Sat, Aug 25, 2012 at 08:00:56AM +0800, Bill Huang wrote:
> > nvpublic
> > > So what you're asking for is a feature to do what
> > > CONFIG_PM_SLEEP_SMP does, but without CONFIG_PM_SLEEP_SMP enabled?
> >
> > Yeah pretty much, I'm actually asking should we take care of this
> > since maybe not all platforms will have this config enabled?
> > >
> > > Why not just ensure that CONFIG_PM_SLEEP_SMP is enabled if your
> > > platform requires that the lowest CPU number be the CPU dealing with reboot?
> >
> > Someday we will have it enabled, but before that we'll hit the issue,
> > so you don't think this should be taken care of? Thanks.
> 
> Well, just enable CONFIG_PM_SLEEP_SMP then - it'll be far better than trying to implement something in
> the ARM code, especially as sysrq can be used for poweroff/reboot etc (which will run from atomic
> contexts where you can't switch to another CPU.)
> 
> What you're asking for will make these callbacks fragile for other platforms.

OK, thanks.
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