From: Yury Norov <ynorov@nvidia.com>
Date: Sat, 14 Mar 2026 19:25:44 +0000 (-0400)
Subject: cpufreq: optimize policy_is_shared()
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=16c1e8385b3bb65d412d7a60107f8894587c63fa;p=thirdparty%2Fkernel%2Flinux.git

cpufreq: optimize policy_is_shared()

The switch to cpumask_nth() over cpumask_weight(), as it may return
earlier - as soon as the function counts the required number of CPUs.

Signed-off-by: Yury Norov <ynorov@nvidia.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Zhongqiu Han <zhongqiu.han@oss.qualcomm.com>
Link: https://patch.msgid.link/20260314192544.605914-1-ynorov@nvidia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index cc894fc389710..8ca2bcb3d7aee 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -232,7 +232,7 @@ static inline bool policy_is_inactive(struct cpufreq_policy *policy)
 
 static inline bool policy_is_shared(struct cpufreq_policy *policy)
 {
-	return cpumask_weight(policy->cpus) > 1;
+	return cpumask_nth(1, policy->cpus) < nr_cpumask_bits;
 }
 
 #ifdef CONFIG_CPU_FREQ