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[Xen-devel] Re: xen: IPI interrupts not resumed early enough on suspend/

To: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: xen: IPI interrupts not resumed early enough on suspend/resume
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Mon, 3 Oct 2011 22:35:45 +0200 (CEST)
Cc: "Rafael J. Wysocki" <rjw@xxxxxxx>, linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <Jeremy.Fitzhardinge@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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On Mon, 3 Oct 2011, Ian Campbell wrote:
> On Mon, 2011-10-03 at 19:42 +0100, Thomas Gleixner wrote:
> > On Mon, 3 Oct 2011, Ian Campbell wrote:
> > > I can see a few options for how I might go about solving this in a
> > > non-hacky way, which approach do you think would be preferable:
> > 
> > The question is whether you need to disable the IPI interrupt at
> > all. If not, we have a flag for that.
> 
> We already that flag for these (I think that was why it was added even).
> The issue is that in the resuming domain on the other side event
> channels all start off masked and something needs to unmask them.

Bah.
 
> > >       * Add "IRQF_RESUME_EARLY", driven from syscore_resume, and use it
> > >         for these interrupts.
> > 
> > That's the preferable solution, as we could use that for PPC as well,
> > unless we can move stuff around, so we disable stuff later.
> 
> OK

I guess we should go down that road then.

Thanks,

        tglx

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