linux-kernel - [PATCH 13/14] xen: events: do not workaround too-small nr

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Message-Id: <1299692486-28634-13-git-send-email-ian.campbell@citrix.com>
Date:	Wed,  9 Mar 2011 17:41:25 +0000
From:	Ian Campbell <ian.campbell@...rix.com>
To:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: [PATCH 13/14] xen: events: do not workaround too-small nr_irqs

This workaround was somewhat useful prior to the introduction of the
core irq allocator and 026c9d2d0d75 "xen: events: allocate GSIs and
dynamic IRQs from separate IRQ ranges." but should be unnecessary now.

If nr_irqs turns out to be too small under Xen then we should increase
nr_irqs rather than working around the core allocator in this way.

In my configuration NR_IRQS ends up being 2304 with nr_irq_gsi 272
which is sufficient.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Jeremy Fitzhardinge <jeremy@...p.org>
---
 drivers/xen/events.c |    7 -------
 1 files changed, 0 insertions(+), 7 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index b07f5bb..51c6a5b 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -423,15 +423,8 @@ static int xen_allocate_irq_dynamic(void)
 		first = get_nr_irqs_gsi();
 #endif
 
-retry:
 	irq = irq_alloc_desc_from(first, -1);
 
-	if (irq == -ENOMEM && first > NR_IRQS_LEGACY) {
-		printk(KERN_ERR "Out of dynamic IRQ space and eating into GSI space. You should increase nr_irqs\n");
-		first = max(NR_IRQS_LEGACY, first - NR_IRQS_LEGACY);
-		goto retry;
-	}
-
 	if (irq < 0)
 		panic("No available IRQ to bind to: increase nr_irqs!\n");
 
-- 
1.5.6.5

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