linux-kernel - [PATCH] [216/275] fix per-cpu flag problem in the cpu affinity checkers

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Message-Id: <20110330210741.2309D3E1A05@tassilo.jf.intel.com>
Date:	Wed, 30 Mar 2011 14:07:41 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	tglx@...utronix.de, James.Bottomley@...e.de, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [216/275] fix per-cpu flag problem in the cpu affinity checkers

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Thomas Gleixner <tglx@...utronix.de>

commit 9804c9eaeacfe78651052c5ddff31099f60ef78c upstream.

The CHECK_IRQ_PER_CPU is wrong, it should be checking
irq_to_desc(irq)->status not just irq.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

Index: linux-2.6.35.y/arch/parisc/kernel/irq.c
===================================================================
--- linux-2.6.35.y.orig/arch/parisc/kernel/irq.c	2011-03-29 22:50:31.235459182 -0700
+++ linux-2.6.35.y/arch/parisc/kernel/irq.c	2011-03-29 23:03:02.750229799 -0700
@@ -117,7 +117,7 @@
 	int cpu_dest;
 
 	/* timer and ipi have to always be received on all CPUs */
-	if (CHECK_IRQ_PER_CPU(irq)) {
+	if (CHECK_IRQ_PER_CPU(irq_to_desc(irq)->status)) {
 		/* Bad linux design decision.  The mask has already
 		 * been set; we must reset it */
 		cpumask_setall(irq_desc[irq].affinity);
--
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