linux-kernel - Re: [patch 0/4] XEN: Interrupt cleanups

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Date:	Tue, 8 Feb 2011 14:03:31 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/4] XEN: Interrupt cleanups

On Mon, 2011-02-07 at 13:57 -0800, Jeremy Fitzhardinge wrote:
> On 02/07/2011 01:33 PM, Thomas Gleixner wrote:
> > Ok. The irq_chip conversion is mostly mechanical, but I'm really
> > concerned about that IRQ_SUSPENDED hackery. It'd be nice if you
> > resp. Ian could give that a test ride. That would allow me to cleanup
> > stuff in the core code.
> 
> Ian notes: "tglx's 4 patch interrupt cleanup series on LKML causes some
> oddities on PV migration. Will dig further tomorrow..."
> 
> So it looks like there's still something amiss.

The patches missed an indirect use of IRQF_NO_SUSPEND pulled in via
IRQF_TIMER. The following fixed things for me (probably belongs in your
patch 4/4).

With this fixlet PV guest migration works just fine. I also booted the
entire series as a dom0 kernel and it appeared fine.

I also tested alongside the cleanup patches Jeremy mentioned before and
as expected there is no interaction.

So, with the fixes to 2/4 (irq_move_irq think from yesterday) and 4/4
(below), the entire series is:
Acked-by: Ian Campbell <ian.campbell@...rix.com>

Ian.

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 067759e..2e2d370 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -397,7 +397,9 @@ void xen_setup_timer(int cpu)
 		name = "<timer kasprintf failed>";
 
 	irq = bind_virq_to_irqhandler(VIRQ_TIMER, cpu, xen_timer_interrupt,
-				      IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING|IRQF_TIMER,
+				      IRQF_DISABLED|IRQF_PERCPU|
+				      IRQF_NOBALANCING|IRQF_TIMER|
+				      IRQF_FORCE_RESUME,
 				      name, NULL);
 
 	evt = &per_cpu(xen_clock_events, cpu);


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