1. Patchew
  2. linux
  3. [PATCH v5 0/6] cpufreq: use __free() for all cpufreq_cpu_get() references
  4. View patch

[PATCH v5 3/6] cpufreq: intel_pstate: Use scope-based cleanup helper

Zihuan Zhang posted 6 patches 5 months, 1 week ago
[PATCH v5 3/6] cpufreq: intel_pstate: Use scope-based cleanup helper
Posted by Zihuan Zhang 5 months, 1 week ago 
Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
annotation for policy references. This reduces the risk of reference
counting mistakes and aligns the code with the latest kernel style.

No functional change intended.

Signed-off-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
---
 drivers/cpufreq/intel_pstate.c | 59 +++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 26 deletions(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index f366d35c5840..0b54e08f9447 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -1502,9 +1502,8 @@ static void __intel_pstate_update_max_freq(struct cpufreq_policy *policy,
 
 static bool intel_pstate_update_max_freq(struct cpudata *cpudata)
 {
-	struct cpufreq_policy *policy __free(put_cpufreq_policy);
+	struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpudata->cpu);
 
-	policy = cpufreq_cpu_get(cpudata->cpu);
 	if (!policy)
 		return false;
 
@@ -1695,41 +1694,49 @@ static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
 	return count;
 }
 
-static void update_qos_request(enum freq_qos_req_type type)
+static bool intel_pstate_cpufreq_update_limits(int cpu, enum freq_qos_req_type type)
 {
 	struct freq_qos_request *req;
-	struct cpufreq_policy *policy;
-	int i;
+	unsigned int freq, perf_pct;
+	struct cpudata *data = all_cpu_data[cpu];
+	struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpu);
 
-	for_each_possible_cpu(i) {
-		struct cpudata *cpu = all_cpu_data[i];
-		unsigned int freq, perf_pct;
+	if (!policy)
+		return false;
 
-		policy = cpufreq_cpu_get(i);
-		if (!policy)
-			continue;
+	req = policy->driver_data;
 
-		req = policy->driver_data;
-		cpufreq_cpu_put(policy);
+	if (!req)
+		return false;
 
-		if (!req)
-			continue;
+	if (hwp_active)
+		intel_pstate_get_hwp_cap(data);
 
-		if (hwp_active)
-			intel_pstate_get_hwp_cap(cpu);
+	if (type == FREQ_QOS_MIN) {
+		perf_pct = global.min_perf_pct;
+	} else {
+		req++;
+		perf_pct = global.max_perf_pct;
+	}
 
-		if (type == FREQ_QOS_MIN) {
-			perf_pct = global.min_perf_pct;
-		} else {
-			req++;
-			perf_pct = global.max_perf_pct;
-		}
+	freq = DIV_ROUND_UP(data->pstate.turbo_freq * perf_pct, 100);
 
-		freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * perf_pct, 100);
+	if (freq_qos_update_request(req, freq) < 0)
+		pr_warn("Failed to update freq constraint: CPU%d\n", cpu);
 
-		if (freq_qos_update_request(req, freq) < 0)
-			pr_warn("Failed to update freq constraint: CPU%d\n", i);
+	return true;
+}
+
+
+static void update_qos_request(enum freq_qos_req_type type)
+{
+	int i;
+
+	for_each_possible_cpu(i) {
+		if (!intel_pstate_cpufreq_update_limits(i, type))
+			continue;
 	}
+
 }
 
 static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
-- 
2.25.1
Re: [PATCH v5 3/6] cpufreq: intel_pstate: Use scope-based cleanup helper
Posted by Rafael J. Wysocki 5 months, 1 week ago 
On Fri, Sep 5, 2025 at 3:24 PM Zihuan Zhang <zhangzihuan@kylinos.cn> wrote:
>
> Replace the manual cpufreq_cpu_put() with __free(put_cpufreq_policy)
> annotation for policy references. This reduces the risk of reference
> counting mistakes and aligns the code with the latest kernel style.
>
> No functional change intended.
>
> Signed-off-by: Zihuan Zhang <zhangzihuan@kylinos.cn>
> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>

No, sorry.  I've already said that this isn't going to work:

https://lore.kernel.org/linux-pm/CAJZ5v0gN1T5woSF0tO=TbAh+2-sWzxFjWyDbB7wG2TFCOU01iQ@mail.gmail.com/

so why are you resending it?

And making changes to it in the process without saying what they are?

Please stop adding confusion.

> ---
>  drivers/cpufreq/intel_pstate.c | 59 +++++++++++++++++++---------------
>  1 file changed, 33 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index f366d35c5840..0b54e08f9447 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -1502,9 +1502,8 @@ static void __intel_pstate_update_max_freq(struct cpufreq_policy *policy,
>
>  static bool intel_pstate_update_max_freq(struct cpudata *cpudata)
>  {
> -       struct cpufreq_policy *policy __free(put_cpufreq_policy);
> +       struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpudata->cpu);
>
> -       policy = cpufreq_cpu_get(cpudata->cpu);
>         if (!policy)
>                 return false;
>
> @@ -1695,41 +1694,49 @@ static ssize_t store_no_turbo(struct kobject *a, struct kobj_attribute *b,
>         return count;
>  }
>
> -static void update_qos_request(enum freq_qos_req_type type)
> +static bool intel_pstate_cpufreq_update_limits(int cpu, enum freq_qos_req_type type)
>  {
>         struct freq_qos_request *req;
> -       struct cpufreq_policy *policy;
> -       int i;
> +       unsigned int freq, perf_pct;
> +       struct cpudata *data = all_cpu_data[cpu];
> +       struct cpufreq_policy *policy __free(put_cpufreq_policy) = cpufreq_cpu_get(cpu);
>
> -       for_each_possible_cpu(i) {
> -               struct cpudata *cpu = all_cpu_data[i];
> -               unsigned int freq, perf_pct;
> +       if (!policy)
> +               return false;
>
> -               policy = cpufreq_cpu_get(i);
> -               if (!policy)
> -                       continue;
> +       req = policy->driver_data;
>
> -               req = policy->driver_data;
> -               cpufreq_cpu_put(policy);
> +       if (!req)
> +               return false;
>
> -               if (!req)
> -                       continue;
> +       if (hwp_active)
> +               intel_pstate_get_hwp_cap(data);
>
> -               if (hwp_active)
> -                       intel_pstate_get_hwp_cap(cpu);
> +       if (type == FREQ_QOS_MIN) {
> +               perf_pct = global.min_perf_pct;
> +       } else {
> +               req++;
> +               perf_pct = global.max_perf_pct;
> +       }
>
> -               if (type == FREQ_QOS_MIN) {
> -                       perf_pct = global.min_perf_pct;
> -               } else {
> -                       req++;
> -                       perf_pct = global.max_perf_pct;
> -               }
> +       freq = DIV_ROUND_UP(data->pstate.turbo_freq * perf_pct, 100);
>
> -               freq = DIV_ROUND_UP(cpu->pstate.turbo_freq * perf_pct, 100);
> +       if (freq_qos_update_request(req, freq) < 0)
> +               pr_warn("Failed to update freq constraint: CPU%d\n", cpu);
>
> -               if (freq_qos_update_request(req, freq) < 0)
> -                       pr_warn("Failed to update freq constraint: CPU%d\n", i);
> +       return true;
> +}
> +
> +
> +static void update_qos_request(enum freq_qos_req_type type)
> +{
> +       int i;
> +
> +       for_each_possible_cpu(i) {
> +               if (!intel_pstate_cpufreq_update_limits(i, type))
> +                       continue;
>         }
> +
>  }
>
>  static ssize_t store_max_perf_pct(struct kobject *a, struct kobj_attribute *b,
> --
> 2.25.1
>
>

Patchew 2.1-devel-b67e4c2

© 2016 - 2026 Red Hat, Inc.