linux-kernel - Re: [Xen-devel] [PATCH 06/14] xen: events: refactor GSI pirq bindings functions

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Date:	Thu, 10 Mar 2011 08:37:18 +0000
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [Xen-devel] [PATCH 06/14] xen: events: refactor GSI pirq
 bindings functions

On Thu, 2011-03-10 at 04:00 +0000, Konrad Rzeszutek Wilk wrote:
> 	if (0 == nr_ioapics) {
> > -		for (irq = 0; irq < NR_IRQS_LEGACY; irq++)
> > -			xen_allocate_pirq(irq, 0, "xt-pic");
> > +		for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
> > +			pirq = xen_allocate_pirq_gsi(irq);
> > +			if (pirq < 0)
> > +				break;
> 
> Would it make sense to print a warning here?

I was almost tempted by a BUG_ON but:

8<-------------------------------------------------

>From b5f92c9d914988cd29c45a84cde462a8588467b6 Mon Sep 17 00:00:00 2001
From: Ian Campbell <ian.campbell@...rix.com>
Date: Thu, 10 Mar 2011 08:36:55 +0000
Subject: [PATCH] xen: irq: warn if we cannot allocate a PIRQ for the legacy IRQs in dom0

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
---
 arch/x86/pci/xen.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 3ee5f4a..ca58a73 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -452,7 +452,8 @@ void __init xen_setup_pirqs(void)
 	if (0 == nr_ioapics) {
 		for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
 			pirq = xen_allocate_pirq_gsi(irq);
-			if (pirq < 0)
+			if (WARN(pirq < 0,
+				 "Could not allocate PIRQ for legacy interrupt\n"))
 				break;
 			irq = xen_bind_pirq_gsi_to_irq(irq, pirq, 0, "xt-pic");
 		}
-- 
1.5.6.5



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