| From | Yury Norov <> | Subject | [PATCH 24/54] time: replace cpumask_weight with cpumask_empty in clocksource.c | Date | Sun, 23 Jan 2022 10:38:55 -0800 |
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clocksource_verify_percpu() 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/time/clocksource.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 1cf73807b450..a2fecb4d8c0e 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -337,7 +337,7 @@ void clocksource_verify_percpu(struct clocksource *cs) cpus_read_lock(); preempt_disable(); clocksource_verify_choose_cpus(); - if (cpumask_weight(&cpus_chosen) == 0) { + if (cpumask_empty(&cpus_chosen)) { preempt_enable(); cpus_read_unlock(); pr_warn("Not enough CPUs to check clocksource '%s'.\n", cs->name); -- 2.30.2
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