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authorPeter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>2010-05-05 13:56:42 -0700
committerThomas Gleixner <tglx@linutronix.de>2010-05-12 11:23:34 +0200
commit4308ad801193f14ff42cb746da37cf07e35f0d08 (patch)
treed25466295270408c11a234658b70c43095aed4d3
parente7a297b0d7d6049bd4e423ac1e17da31e4c401b8 (diff)
downloadlinux-2.6.34-ux500-4308ad801193f14ff42cb746da37cf07e35f0d08.tar.gz
genirq: 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. [ tglx: use zalloc_cpumask_var instead of clearing it under the lock ] Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Cc: davem@davemloft.net Cc: arjan@linux.jf.intel.com Cc: bhutchings@solarflare.com LKML-Reference: <20100505205638.5426.87189.stgit@ppwaskie-hc2.jf.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--kernel/irq/proc.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 4f9427a30e1..09a2ee540bd 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -38,14 +38,12 @@ static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
unsigned long flags;
cpumask_var_t mask;
- if (!alloc_cpumask_var(&mask, GFP_KERNEL))
+ if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
raw_spin_lock_irqsave(&desc->lock, flags);
if (desc->affinity_hint)
cpumask_copy(mask, desc->affinity_hint);
- else
- cpumask_setall(mask);
raw_spin_unlock_irqrestore(&desc->lock, flags);
seq_cpumask(m, mask);