| From | Yury Norov <> | Subject | [PATCH 22/49] sched: replace cpumask_weight with cpumask_empty where appropriate | Date | Thu, 10 Feb 2022 14:49:06 -0800 |
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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> --- kernel/sched/core.c | 2 +- kernel/sched/topology.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 28d1b7af03dc..ed7b392945b7 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -8711,7 +8711,7 @@ 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); diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index d201a7052a29..8478e2a8cd65 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -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; -- 2.32.0
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