cpufreq: Notify all policy->cpus in cpufreq_notify_transition()

policy->cpus contains all online cpus that have single shared clock line. And
their frequencies are always updated together.

Many SMP system's cpufreq drivers take care of this in individual drivers but
the best place for this code is in cpufreq core.

This patch modifies cpufreq_notify_transition() to notify frequency change for
all cpus in policy->cpus and hence updates all users of this API.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 12 insertions, 10 deletions

diff --git a/arch/ia64/kernel/cpufreq/acpi-cpufreq.c b/arch/ia64/kernel/cpufreq/acpi-cpufreq.c
index f09b174..4700fef 100644
--- a/arch/ia64/kernel/cpufreq/acpi-cpufreq.c
+++ b/arch/ia64/kernel/cpufreq/acpi-cpufreq.c
@@ -137,7 +137,7 @@ migrate_end:
 static int
 processor_set_freq (
 	struct cpufreq_acpi_io	*data,
-	unsigned int		cpu,
+	struct cpufreq_policy   *policy,
 	int			state)
 {
 	int			ret = 0;
@@ -149,8 +149,8 @@ processor_set_freq (
 	pr_debug("processor_set_freq\n");
 
 	saved_mask = current->cpus_allowed;
-	set_cpus_allowed_ptr(current, cpumask_of(cpu));
-	if (smp_processor_id() != cpu) {
+	set_cpus_allowed_ptr(current, cpumask_of(policy->cpu));
+	if (smp_processor_id() != policy->cpu) {
 		retval = -EAGAIN;
 		goto migrate_end;
 	}
@@ -170,12 +170,11 @@ processor_set_freq (
 		data->acpi_data.state, state);
 
 	/* cpufreq frequency struct */
-	cpufreq_freqs.cpu = cpu;
 	cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency;
 	cpufreq_freqs.new = data->freq_table[state].frequency;
 
 	/* notify cpufreq */
-	cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_PRECHANGE);
+	cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_PRECHANGE);
 
 	/*
 	 * First we write the target state's 'control' value to the
@@ -189,17 +188,20 @@ processor_set_freq (
 	ret = processor_set_pstate(value);
 	if (ret) {
 		unsigned int tmp = cpufreq_freqs.new;
-		cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
+		cpufreq_notify_transition(policy, &cpufreq_freqs,
+				CPUFREQ_POSTCHANGE);
 		cpufreq_freqs.new = cpufreq_freqs.old;
 		cpufreq_freqs.old = tmp;
-		cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_PRECHANGE);
-		cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
+		cpufreq_notify_transition(policy, &cpufreq_freqs,
+				CPUFREQ_PRECHANGE);
+		cpufreq_notify_transition(policy, &cpufreq_freqs,
+				CPUFREQ_POSTCHANGE);
 		printk(KERN_WARNING "Transition failed with error %d\n", ret);
 		retval = -ENODEV;
 		goto migrate_end;
 	}
 
-	cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
+	cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_POSTCHANGE);
 
 	data->acpi_data.state = state;
 
@@ -240,7 +242,7 @@ acpi_cpufreq_target (
 	if (result)
 		return (result);
 
-	result = processor_set_freq(data, policy->cpu, next_state);
+	result = processor_set_freq(data, policy, next_state);
 
 	return (result);
 }