Commit 8afbcaf8 authored by Yury Norov's avatar Yury Norov Committed by Thomas Gleixner
Browse files

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: default avatarYury Norov <yury.norov@gmail.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20220210224933.379149-24-yury.norov@gmail.com
parent efaa0227

kernel/time/clocksource.c

+1 −1
Original line number Diff line number Diff line
@@ -343,7 +343,7 @@ 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);