| Date | Sun, 10 Apr 2022 20:35:13 -0000 | From | "tip-bot2 for Yury Norov" <> | Subject | [tip: timers/core] clocksource: Replace cpumask_weight() with cpumask_empty() |
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The following commit has been merged into the timers/core branch of tip:
Commit-ID: 8afbcaf8690dac19ebf570a4e4fef9c59c75bf8e Gitweb: https://git.kernel.org/tip/8afbcaf8690dac19ebf570a4e4fef9c59c75bf8e Author: Yury Norov <yury.norov@gmail.com> AuthorDate: Thu, 10 Feb 2022 14:49:07 -08:00 Committer: Thomas Gleixner <tglx@linutronix.de> CommitterDate: Sun, 10 Apr 2022 22:30:04 +02:00
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
--- 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 95d7ca3..cee5da1 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);
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