From: Yury Norov <yury.norov@gmail.com>
Date: Sun, 23 Jan 2022 18:38:55 +0000 (-0800)
Subject: clocksource: replace cpumask_weight with cpumask_empty in clocksource.c
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=95e3a97387d6c396172f944b45bd515c7d1e8bc2;p=linux.git

clocksource: replace cpumask_weight with cpumask_empty in clocksource.c

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>
---

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 95d7ca35bdf2c..cee5da1e54c41 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -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);