linux-kernel - [PATCH linux-next] irq: Clear CPU mask in affinity

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Date:	Wed, 05 May 2010 13:56:42 -0700
From:	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
To:	tglx@...utronix.de, davem@...emloft.net, arjan@...ux.jf.intel.com,
	bhutchings@...arflare.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH linux-next] irq: Clear CPU mask in affinity_hint when none is
	provided

When an interrupt is disabled and torn down, the CPU mask
returned through affinity_hint right now is all CPUs.  Also, for
drivers that don't provide an affinity_hint mask, this can be
misleading.  There should be no hint at all, meaning an empty
CPU mask.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
---

 kernel/irq/proc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index e1e7408..9ffa24d 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -45,7 +45,7 @@ static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
 	if (desc->affinity_hint)
 		cpumask_copy(mask, desc->affinity_hint);
 	else
-		cpumask_setall(mask);
+		cpumask_clear(mask);
 	raw_spin_unlock_irqrestore(&desc->lock, flags);
 
 	seq_cpumask(m, mask);

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