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@xxxxxxxxx>
---
mm/vmstat.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/vmstat.c b/mm/vmstat.c
index d5cc8d739fac..27a94afd4ee5 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -2041,7 +2041,7 @@ static void __init init_cpu_node_state(void)
int node;
for_each_online_node(node) {
- if (cpumask_weight(cpumask_of_node(node)) > 0)
+ if (!cpumask_empty(cpumask_of_node(node)))
node_set_state(node, N_CPU);
}
}
@@ -2068,7 +2068,7 @@ static int vmstat_cpu_dead(unsigned int cpu)
refresh_zone_stat_thresholds();
node_cpus = cpumask_of_node(node);
- if (cpumask_weight(node_cpus) > 0)
+ if (!cpumask_empty(node_cpus))
return 0;
node_clear_state(node, N_CPU);
--
2.32.0
