From: Peter P Waskiewicz Jr Date: Wed, 5 May 2010 20:56:42 +0000 (-0700) Subject: genirq: Clear CPU mask in affinity_hint when none is provided X-Git-Tag: firefly_0821_release~9833^2~2110^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4308ad801193f14ff42cb746da37cf07e35f0d08;p=firefly-linux-kernel-4.4.55.git 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 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 --- diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c index 4f9427a30e14..09a2ee540bd2 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);