Either CPUs are hot-unplugged or suspend/resume occurs, cpufreq core will send notifications to cpufreq-stats and stats structure and sysfs entries would be correctly handled..
And so we don't actually need hotcpu notifiers in cpufreq-stats anymore. We were only handling cpu hot-unplug events here and that are already taken care of by POLICY notifiers.
Signed-off-by: Viresh Kumar viresh.kumar@linaro.org --- drivers/cpufreq/cpufreq_stats.c | 38 ++------------------------------------ 1 file changed, 2 insertions(+), 36 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index 0f71562..8fa5844 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -294,11 +294,8 @@ static int cpufreq_stat_notifier_policy(struct notifier_block *nb, if (val == CPUFREQ_CREATE_POLICY) ret = cpufreq_stats_create_table(policy, table); else if (val == CPUFREQ_REMOVE_POLICY) { - /* This might already be freed by cpu hotplug notifier */ - if (per_cpu(cpufreq_stats_table, cpu)) { - cpufreq_stats_free_sysfs(cpu); - cpufreq_stats_free_table(cpu); - } + cpufreq_stats_free_sysfs(cpu); + cpufreq_stats_free_table(cpu); }
return ret; @@ -340,33 +337,6 @@ static int cpufreq_stat_notifier_trans(struct notifier_block *nb, return 0; }
-static int cpufreq_stat_cpu_callback(struct notifier_block *nfb, - unsigned long action, - void *hcpu) -{ - unsigned int cpu = (unsigned long)hcpu; - - /* Don't free/allocate stats during suspend/resume */ - if (action & CPU_TASKS_FROZEN) - return 0; - - switch (action) { - case CPU_DOWN_PREPARE: - cpufreq_stats_free_sysfs(cpu); - break; - case CPU_DEAD: - cpufreq_stats_free_table(cpu); - break; - } - return NOTIFY_OK; -} - -/* priority=1 so this will get called before cpufreq_remove_dev */ -static struct notifier_block cpufreq_stat_cpu_notifier __refdata = { - .notifier_call = cpufreq_stat_cpu_callback, - .priority = 1, -}; - static struct notifier_block notifier_policy_block = { .notifier_call = cpufreq_stat_notifier_policy }; @@ -386,14 +356,11 @@ static int __init cpufreq_stats_init(void) if (ret) return ret;
- register_hotcpu_notifier(&cpufreq_stat_cpu_notifier); - ret = cpufreq_register_notifier(¬ifier_trans_block, CPUFREQ_TRANSITION_NOTIFIER); if (ret) { cpufreq_unregister_notifier(¬ifier_policy_block, CPUFREQ_POLICY_NOTIFIER); - unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier); for_each_online_cpu(cpu) cpufreq_stats_free_table(cpu); return ret; @@ -409,7 +376,6 @@ static void __exit cpufreq_stats_exit(void) CPUFREQ_POLICY_NOTIFIER); cpufreq_unregister_notifier(¬ifier_trans_block, CPUFREQ_TRANSITION_NOTIFIER); - unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier); for_each_online_cpu(cpu) { cpufreq_stats_free_table(cpu); cpufreq_stats_free_sysfs(cpu);