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clocksource: Replace cpumask_weight() with cpumask_empty() 

clocksource_verify_percpu() calls cpumask_weight() to check if any bit of a
given cpumask is set.

This can be done 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: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220210224933.379149-24-yury.norov@gmail.com
This commit is contained in:
Yury Norov 2022-02-10 14:49:07 -08:00 committed by Thomas Gleixner
parent efaa0227f6
commit 8afbcaf869
1 changed files with 1 additions and 1 deletions
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2
kernel/time/clocksource.c
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@ -343,7 +343,7 @@ void clocksource_verify_percpu(struct clocksource *cs)
cpus_read_lock(); cpus_read_lock();
preempt_disable(); preempt_disable();
clocksource_verify_choose_cpus(); clocksource_verify_choose_cpus();
if (cpumask_weight(&cpus_chosen) == 0) { if (cpumask_empty(&cpus_chosen)) {
preempt_enable(); preempt_enable();
cpus_read_unlock(); cpus_read_unlock();
pr_warn("Not enough CPUs to check clocksource '%s'.\n", cs->name); pr_warn("Not enough CPUs to check clocksource '%s'.\n", cs->name);