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sched: replace cpumask_weight with cpumask_empty where appropriate

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In some places, kernel/sched 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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20220210224933.379149-23-yury.norov@gmail.com
This commit is contained in:
Yury Norov 2022-02-10 14:49:06 -08:00 committed by Peter Zijlstra
parent 3624ba7b5e
commit 1087ad4e3f
2 changed files with 2 additions and 2 deletions
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2
kernel/sched/core.c
View file

@ -8708,7 +8708,7 @@ int cpuset_cpumask_can_shrink(const struct cpumask *cur,
{
int ret = 1;
if (!cpumask_weight(cur))
if (cpumask_empty(cur))
return ret;
ret = dl_cpuset_cpumask_can_shrink(cur, trial);

2
kernel/sched/topology.c
View file

@ -74,7 +74,7 @@ static int sched_domain_debug_one(struct sched_domain *sd, int cpu, int level,
break;
}
if (!cpumask_weight(sched_group_span(group))) {
if (cpumask_empty(sched_group_span(group))) {
printk(KERN_CONT "\n");
printk(KERN_ERR "ERROR: empty group\n");
break;