linux-kernel - [PATCH] [39/45] x86_64: block irq balancing for timer

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Message-Id: <20070921204522.5E4AB14F22@wotan.suse.de>
Date:	Fri, 21 Sep 2007 22:45:22 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	venkatesh.pallipadi@...el.com, ak@...e.de, mingo@...e.hu,
	johnstul@...ibm.com, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [39/45] x86_64: block irq balancing for timer


From: Venki Pallipadi <venkatesh.pallipadi@...el.com>

Disable irq balancing on IRQ0.  Several SIS chipsets lock up when you try to
change affinity of IRQ #0.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Andi Kleen <ak@...e.de>
Cc: Andi Kleen <ak@...e.de>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: john stultz <johnstul@...ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 arch/x86_64/kernel/time.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux/arch/x86_64/kernel/time.c
===================================================================
--- linux.orig/arch/x86_64/kernel/time.c
+++ linux/arch/x86_64/kernel/time.c
@@ -360,7 +360,7 @@ void stop_timer_interrupt(void)
 
 static struct irqaction irq0 = {
 	.handler	= timer_interrupt,
-	.flags		= IRQF_DISABLED | IRQF_IRQPOLL,
+	.flags		= IRQF_DISABLED | IRQF_IRQPOLL | IRQF_NOBALANCING,
 	.mask		= CPU_MASK_NONE,
 	.name		= "timer"
 };
-
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