cpufreq: Track cpu managing sysfs kobjects separately

In order to prepare for the next few commits, that will stop migrating
sysfs files on cpu hotplug, this patch starts managing sysfs-cpu
separately.

The behavior is still the same as we are still migrating sysfs files on
hotplug, later commits would change that.

Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
index 870df94..5d780ff 100644 (file)
--- a/drivers/cpufreq/cpufreq.c
+++ b/drivers/cpufreq/cpufreq.c
@@ -959,7 +959,7 @@ static int cpufreq_add_dev_symlink(struct cpufreq_policy *policy)
        for_each_cpu(j, policy->cpus) {
                struct device *cpu_dev;
 
-               if (j == policy->cpu)
+               if (j == policy->kobj_cpu)
                        continue;
 
                pr_debug("Adding link for CPU: %u\n", j);
@@ -1178,6 +1178,7 @@ static int update_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu,
 
        down_write(&policy->rwsem);
        policy->cpu = cpu;
+       policy->kobj_cpu = cpu;
        up_write(&policy->rwsem);
 
        return 0;
@@ -1235,10 +1236,12 @@ static int cpufreq_add_dev(struct device *dev, struct subsys_interface *sif)
         * the creation of a brand new one. So we need to perform this update
         * by invoking update_policy_cpu().
         */
-       if (recover_policy && cpu != policy->cpu)
+       if (recover_policy && cpu != policy->cpu) {
                WARN_ON(update_policy_cpu(policy, cpu, dev));
-       else
+       } else {
                policy->cpu = cpu;
+               policy->kobj_cpu = cpu;
+       }
 
        cpumask_copy(policy->cpus, cpumask_of(cpu));
 
@@ -1417,7 +1420,7 @@ static int __cpufreq_remove_dev_prepare(struct device *dev,
                        CPUFREQ_NAME_LEN);
        up_write(&policy->rwsem);
 
-       if (cpu != policy->cpu) {
+       if (cpu != policy->kobj_cpu) {
                sysfs_remove_link(&dev->kobj, "cpufreq");
        } else if (cpus > 1) {
                /* Nominate new CPU */

diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 48e37c0..29ad97c 100644 (file)
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -65,7 +65,9 @@ struct cpufreq_policy {
 
        unsigned int            shared_type; /* ACPI: ANY or ALL affected CPUs
                                                should set cpufreq */
-       unsigned int            cpu;    /* cpu nr of CPU managing this policy */
+       unsigned int            cpu;    /* cpu managing this policy, must be online */
+       unsigned int            kobj_cpu; /* cpu managing sysfs files, can be offline */
+
        struct clk              *clk;
        struct cpufreq_cpuinfo  cpuinfo;/* see above */