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genirq/affinity: replace cpumask_weight with cpumask_empty where appropriate
__irq_build_affinity_masks() calls cpumask_weight() to check if any bit of a given cpumask is set. We can do it more efficiently with cpumask_empty() because cpumask_empty() stops traversing the cpumask as soon as it finds first set bit, while cpumask_weight() counts all bits unconditionally. Signed-off-by: Yury Norov <yury.norov@gmail.com>
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@ -258,7 +258,7 @@ static int __irq_build_affinity_masks(unsigned int startvec,
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nodemask_t nodemsk = NODE_MASK_NONE;
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struct node_vectors *node_vectors;
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if (!cpumask_weight(cpu_mask))
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if (cpumask_empty(cpu_mask))
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return 0;
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nodes = get_nodes_in_cpumask(node_to_cpumask, cpu_mask, &nodemsk);
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