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mm/vmstat: replace cpumask_weight with cpumask_empty where appropriate
mm/vmstat.c code 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> Acked-by: Mike Rapoport <rppt@linux.ibm.com>
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@ -2042,7 +2042,7 @@ static void __init init_cpu_node_state(void)
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int node;
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for_each_online_node(node) {
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if (cpumask_weight(cpumask_of_node(node)) > 0)
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if (!cpumask_empty(cpumask_of_node(node)))
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node_set_state(node, N_CPU);
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}
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}
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@ -2074,7 +2074,7 @@ static int vmstat_cpu_dead(unsigned int cpu)
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refresh_zone_stat_thresholds();
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node_cpus = cpumask_of_node(node);
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if (cpumask_weight(node_cpus) > 0)
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if (!cpumask_empty(node_cpus))
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return 0;
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node_clear_state(node, N_CPU);
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