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Subject[PATCH 25/54] mm/vmstat: replace cpumask_weight with cpumask_empty where appropriate
Date
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>
---
mm/vmstat.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 4057372745d0..f56f11e3eef5 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -2035,7 +2035,7 @@ 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);
}
}
@@ -2062,7 +2062,7 @@ 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);
--
2.30.2
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