linux-kernel - Re: [PATCH 1/2] Xen: Fix bug `do_IRQ: cannot handle IRQ -1 vector 0x6 cpu 1'

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Date:	Tue, 19 Aug 2008 12:22:12 -0700
From:	Alok Kataria <akataria@...are.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>,
	Zachary Amsden <zach@...are.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alex Nixon <alex.nixon@...rix.com>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] Xen: Fix bug `do_IRQ: cannot handle IRQ -1 vector
	0x6 cpu 1'

On Mon, 2008-08-18 at 18:36 -0700, Yinghai Lu wrote:
> On Mon, Aug 18, 2008 at 2:38 PM, Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> > Alex Nixon wrote:
> >> From: Alex Nixon <alex.nixon@...rix.com>
> >> Date: Mon, 18 Aug 2008 12:56:48 +0100
> >> Subject: [PATCH] Xen: Fix bug `do_IRQ: cannot handle IRQ -1 vector 0x6 cpu 1'
> >>
> >> Following commit 9c3f2468d8339866d9ef6a25aae31a8909c6be0d, do_IRQ() looks up the IRQ number in the per-cpu variable vector_irq.
> >>
> >> This commit makes Xen initialise an identity vector_irq map for both X86_32 and X86_64.
> >>
> >
> > Thanks Alex.
> >
> > Ingo, please apply.
> >
> > Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> >
> >> Signed-off-by: Alex Nixon <alex.nixon@...rix.com>
> >> ---
> >>  arch/x86/xen/irq.c |    2 --
> >>  1 files changed, 0 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
> >> index 28b85ab..bb04260 100644
> >> --- a/arch/x86/xen/irq.c
> >> +++ b/arch/x86/xen/irq.c
> >> @@ -21,7 +21,6 @@ void xen_force_evtchn_callback(void)
> >>
> >>  static void __init __xen_init_IRQ(void)
> >>  {
> >> -#ifdef CONFIG_X86_64
> >>       int i;
> >>
> >>       /* Create identity vector->irq map */
> >> @@ -31,7 +30,6 @@ static void __init __xen_init_IRQ(void)
> >>               for_each_possible_cpu(cpu)
> >>                       per_cpu(vector_irq, cpu)[i] = i;
> >>       }
> >> -#endif       /* CONFIG_X86_64 */
> >>
> >>       xen_init_IRQ();
> >>  }
> >>
> 
> 
> Rusty,
> can you check tip/master with lguest?  wonder you need to do sth for lguest too.
> we are making 32 bit support per_cpu vector like 64 bit
> 
> also alok, can you check vmi etc...

Yes it crashes VMI too, i will get down to debug this maybe later in the
day. 
Thanks YH, for bringing this to my attention. 

Alok.


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