cpufreq: intel_pstate: Do not walk policy->cpus

intel_pstate_hwp_set() is the only function walking policy->cpus
in intel_pstate.  The rest of the code simply assumes one CPU per
policy, including the initialization code.

Therefore it doesn't make sense for intel_pstate_hwp_set() to
walk policy->cpus as it is guaranteed to have only one bit set
for policy->cpu.

For this reason, rearrange intel_pstate_hwp_set() to take the CPU
number as the argument and drop the loop over policy->cpus from it.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/intel_pstate.c

@@ -792,13 +792,11 @@ static struct freq_attr *hwp_cpufreq_attrs[] = {
 	NULL,
 };
 
-static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
+static void intel_pstate_hwp_set(unsigned int cpu)
 {
-	int min, hw_min, max, hw_max, cpu;
-	u64 value, cap;
-
-	for_each_cpu(cpu, policy->cpus) {
 	struct cpudata *cpu_data = all_cpu_data[cpu];
+	int min, hw_min, max, hw_max;
+	u64 value, cap;
 	s16 epp;
 
 	rdmsrl_on_cpu(cpu, MSR_HWP_CAPABILITIES, &cap);
@@ -840,7 +838,6 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
 		if (epp < 0)
 			goto skip_epp;
 
-
 		epp = 0;
 	} else {
 		/* skip setting EPP, when saved value is invalid */
@@ -869,7 +866,6 @@ static void intel_pstate_hwp_set(struct cpufreq_policy *policy)
 	}
 skip_epp:
 	wrmsrl_on_cpu(cpu, MSR_HWP_REQUEST, value);
-	}
 }
 
 static int intel_pstate_hwp_save_state(struct cpufreq_policy *policy)
@@ -892,7 +888,7 @@ static int intel_pstate_resume(struct cpufreq_policy *policy)
 	mutex_lock(&intel_pstate_limits_lock);
 
 	all_cpu_data[policy->cpu]->epp_policy = 0;
-	intel_pstate_hwp_set(policy);
+	intel_pstate_hwp_set(policy->cpu);
 
 	mutex_unlock(&intel_pstate_limits_lock);
 
@@ -2057,7 +2053,7 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
 	intel_pstate_set_update_util_hook(policy->cpu);
 
 	if (hwp_active)
-		intel_pstate_hwp_set(policy);
+		intel_pstate_hwp_set(policy->cpu);
 
 	mutex_unlock(&intel_pstate_limits_lock);