linux-kernel - Re: [PATCH v3] ARM: xen: only set pm function ptrs for Xen guests

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Message-ID: <alpine.DEB.2.02.1309051802210.6397@kaball.uk.xensource.com>
Date:	Thu, 5 Sep 2013 18:02:39 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	Rob Herring <robherring2@...il.com>,
	<xen-devel@...ts.xensource.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <julien.grall@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH v3] ARM: xen: only set pm function ptrs for Xen guests

On Thu, 29 Aug 2013, Stefano Stabellini wrote:
> On Thu, 29 Aug 2013, Rob Herring wrote:
> > From: Rob Herring <rob.herring@...xeda.com>
> > 
> > xen_pm_init was unconditionally setting pm_power_off and arm_pm_restart
> > function pointers. This breaks multi-platform kernels. Make this
> > conditional on running as a Xen guest and make it a late_initcall to
> > ensure it is setup after platform code for Dom0.
> > 
> > Cc: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > Signed-off-by: Rob Herring <rob.herring@...xeda.com>
> 
> 
> Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> Added to my queue.

FYI we are going to send a pull request for this patch in the 3.12 merge
window, asking for a backport to 3.11.


> 
> >  arch/arm/xen/enlighten.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> > index 8a6295c..7071fca 100644
> > --- a/arch/arm/xen/enlighten.c
> > +++ b/arch/arm/xen/enlighten.c
> > @@ -273,12 +273,15 @@ core_initcall(xen_guest_init);
> >  
> >  static int __init xen_pm_init(void)
> >  {
> > +	if (!xen_domain())
> > +		return -ENODEV;
> > +
> >  	pm_power_off = xen_power_off;
> >  	arm_pm_restart = xen_restart;
> >  
> >  	return 0;
> >  }
> > -subsys_initcall(xen_pm_init);
> > +late_initcall(xen_pm_init);
> >  
> >  static irqreturn_t xen_arm_callback(int irq, void *arg)
> >  {
> > -- 
> > 1.8.1.2
> > 
> 
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