[CPUFREQ] ondemand governor restructure the work callback

Restructure the delayed_work callback in ondemand.

This eliminates the need for smp_processor_id in the callback function and
also helps in proper locking and avoiding flush_workqueue when stopping the
governor (done in subsequent patch).

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>

diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index d52f9b4..a480834 100644 (file)
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -52,19 +52,20 @@ static unsigned int def_sampling_rate;
 static void do_dbs_timer(struct work_struct *work);
 
 /* Sampling types */
-enum dbs_sample {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE};
+enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE};
 
 struct cpu_dbs_info_s {
        cputime64_t prev_cpu_idle;
        cputime64_t prev_cpu_wall;
        struct cpufreq_policy *cur_policy;
        struct delayed_work work;
-       enum dbs_sample sample_type;
-       unsigned int enable;
        struct cpufreq_frequency_table *freq_table;
        unsigned int freq_lo;
        unsigned int freq_lo_jiffies;
        unsigned int freq_hi_jiffies;
+       int cpu;
+       unsigned int enable:1,
+                    sample_type:1;
 };
 static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
 
@@ -402,7 +403,7 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
        if (load < (dbs_tuners_ins.up_threshold - 10)) {
                unsigned int freq_next, freq_cur;
 
-               freq_cur = cpufreq_driver_getavg(policy);
+               freq_cur = __cpufreq_driver_getavg(policy);
                if (!freq_cur)
                        freq_cur = policy->cur;
 
@@ -423,9 +424,11 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
 
 static void do_dbs_timer(struct work_struct *work)
 {
-       unsigned int cpu = smp_processor_id();
-       struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
-       enum dbs_sample sample_type = dbs_info->sample_type;
+       struct cpu_dbs_info_s *dbs_info =
+               container_of(work, struct cpu_dbs_info_s, work.work);
+       unsigned int cpu = dbs_info->cpu;
+       int sample_type = dbs_info->sample_type;
+
        /* We want all CPUs to do sampling nearly on same jiffy */
        int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
 
@@ -454,17 +457,17 @@ static void do_dbs_timer(struct work_struct *work)
        queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
 }
 
-static inline void dbs_timer_init(unsigned int cpu)
+static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info)
 {
-       struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, cpu);
        /* We want all CPUs to do sampling nearly on same jiffy */
        int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
        delay -= jiffies % delay;
 
        ondemand_powersave_bias_init();
-       INIT_DELAYED_WORK_NAR(&dbs_info->work, do_dbs_timer);
        dbs_info->sample_type = DBS_NORMAL_SAMPLE;
-       queue_delayed_work_on(cpu, kondemand_wq, &dbs_info->work, delay);
+       INIT_DELAYED_WORK_NAR(&dbs_info->work, do_dbs_timer);
+       queue_delayed_work_on(dbs_info->cpu, kondemand_wq, &dbs_info->work,
+                             delay);
 }
 
 static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info)
@@ -528,6 +531,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
                        j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j);
                        j_dbs_info->prev_cpu_wall = get_jiffies_64();
                }
+               this_dbs_info->cpu = cpu;
                this_dbs_info->enable = 1;
                /*
                 * Start the timerschedule work, when this governor
@@ -548,7 +552,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 
                        dbs_tuners_ins.sampling_rate = def_sampling_rate;
                }
-               dbs_timer_init(policy->cpu);
+               dbs_timer_init(this_dbs_info);
 
                mutex_unlock(&dbs_mutex);
                break;