linux-kernel - [PATCH v3 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online

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Message-ID: <20250805093330.3715444-3-zhenglifeng1@huawei.com>
Date: Tue, 5 Aug 2025 17:33:29 +0800
From: Lifeng Zheng <zhenglifeng1@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <rafael@...nel.org>,
	<viresh.kumar@...aro.org>, <beata.michalska@....com>, <sudeep.holla@....com>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
	<jonathan.cameron@...wei.com>, <vincent.guittot@...aro.org>,
	<yangyicong@...ilicon.com>, <zhanjie9@...ilicon.com>, <lihuisong@...wei.com>,
	<yubowen8@...wei.com>, <linhongye@...artners.com>, <zhenglifeng1@...wei.com>
Subject: [PATCH v3 2/3] cpufreq: Add a new function to get cpufreq policy without checking if the CPU is online

cpufreq_cpu_get_raw() gets cpufreq policy only if the CPU is in
policy->cpus mask, which means the CPU is already online. But in some
cases, the policy is needed before the CPU is added to cpus mask. Add a
function to get the policy in these cases.

Signed-off-by: Lifeng Zheng <zhenglifeng1@...wei.com>
---
 drivers/cpufreq/cpufreq.c | 11 +++++++++++
 include/linux/cpufreq.h   |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index fc7eace8b65b..2de76a072893 100644
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -198,6 +198,17 @@ struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu)
 }
 EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw);
 
+struct cpufreq_policy *cpufreq_cpu_get_raw_no_check(unsigned int cpu)
+{
+	struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_data, cpu);
+
+	if (policy)
+		return policy;
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(cpufreq_cpu_get_raw_no_check);
+
 unsigned int cpufreq_generic_get(unsigned int cpu)
 {
 	struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu);
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 95f3807c8c55..02ad8173dc10 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -205,6 +205,7 @@ struct cpufreq_freqs {
 
 #ifdef CONFIG_CPU_FREQ
 struct cpufreq_policy *cpufreq_cpu_get_raw(unsigned int cpu);
+struct cpufreq_policy *cpufreq_cpu_get_raw_no_check(unsigned int cpu);
 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu);
 void cpufreq_cpu_put(struct cpufreq_policy *policy);
 #else
-- 
2.33.0