fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / drivers / cpufreq / cpufreq_stats.c

diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c
index 9694b6e..91ad342 100644 (file)
--- a/drivers/cpufreq/cpufreq_stats.c
+++ b/drivers/cpufreq/cpufreq_stats.c
@@ -9,7 +9,6 @@
  * published by the Free Software Foundation.
  */
 
-#include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/sysdev.h>
 #include <linux/cpu.h>
@@ -74,7 +73,7 @@ static ssize_t
 show_total_trans(struct cpufreq_policy *policy, char *buf)
 {
        struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
-       if(!stat)
+       if (!stat)
                return 0;
        return sprintf(buf, "%d\n",
                        cpufreq_stats_table[stat->cpu]->total_trans);
@@ -86,7 +85,7 @@ show_time_in_state(struct cpufreq_policy *policy, char *buf)
        ssize_t len = 0;
        int i;
        struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
-       if(!stat)
+       if (!stat)
                return 0;
        cpufreq_stats_update(stat->cpu);
        for (i = 0; i < stat->state_num; i++) {
@@ -104,7 +103,7 @@ show_trans_table(struct cpufreq_policy *policy, char *buf)
        int i, j;
 
        struct cpufreq_stats *stat = cpufreq_stats_table[policy->cpu];
-       if(!stat)
+       if (!stat)
                return 0;
        cpufreq_stats_update(stat->cpu);
        len += snprintf(buf + len, PAGE_SIZE - len, "   From  :    To\n");
@@ -286,6 +285,7 @@ cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val,
        stat = cpufreq_stats_table[freq->cpu];
        if (!stat)
                return 0;
+
        old_index = freq_table_get_index(stat, freq->old);
        new_index = freq_table_get_index(stat, freq->new);
 
@@ -293,6 +293,9 @@ cpufreq_stat_notifier_trans (struct notifier_block *nb, unsigned long val,
        if (old_index == new_index)
                return 0;
 
+       if (old_index == -1 || new_index == -1)
+               return 0;
+
        spin_lock(&cpufreq_stats_lock);
        stat->last_index = new_index;
 #ifdef CONFIG_CPU_FREQ_STAT_DETAILS
@@ -350,13 +353,11 @@ __init cpufreq_stats_init(void)
                return ret;
        }
 
-       register_cpu_notifier(&cpufreq_stat_cpu_notifier);
-       lock_cpu_hotplug();
+       register_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
        for_each_online_cpu(cpu) {
-               cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_ONLINE,
-                       (void *)(long)cpu);
+               cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier,
+                               CPU_ONLINE, (void *)(long)cpu);
        }
-       unlock_cpu_hotplug();
        return 0;
 }
 static void
@@ -368,17 +369,18 @@ __exit cpufreq_stats_exit(void)
                        CPUFREQ_POLICY_NOTIFIER);
        cpufreq_unregister_notifier(&notifier_trans_block,
                        CPUFREQ_TRANSITION_NOTIFIER);
-       unregister_cpu_notifier(&cpufreq_stat_cpu_notifier);
+       unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier);
        lock_cpu_hotplug();
        for_each_online_cpu(cpu) {
-               cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier, CPU_DEAD,
-                       (void *)(long)cpu);
+               cpufreq_stat_cpu_callback(&cpufreq_stat_cpu_notifier,
+                                               CPU_DEAD, (void *)(long)cpu);
        }
        unlock_cpu_hotplug();
 }
 
 MODULE_AUTHOR ("Zou Nan hai <nanhai.zou@intel.com>");
-MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats through sysfs filesystem");
+MODULE_DESCRIPTION ("'cpufreq_stats' - A driver to export cpufreq stats"
+                               "through sysfs filesystem");
 MODULE_LICENSE ("GPL");
 
 module_init(cpufreq_stats_init);