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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>
This commit is contained in:
Peter P Waskiewicz Jr 2010-05-05 13:56:42 -07:00 committed by Thomas Gleixner
parent e7a297b0d7
commit 4308ad8011
1 changed files with 1 additions and 3 deletions
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4
kernel/irq/proc.c
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@ -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);