+ idle_time = cputime64_sub(cur_wall_time, busy_time);
+ if (wall)
+ *wall = cur_wall_time;
+
+ return idle_time;
+}
+
+static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall)
+{
+ u64 idle_time = get_cpu_idle_time_us(cpu, wall);
+
+ if (idle_time == -1ULL)
+ return get_cpu_idle_time_jiffy(cpu, wall);
+
+ if (dbs_tuners_ins.ignore_nice) {
+ cputime64_t cur_nice;
+ unsigned long cur_nice_jiffies;
+ struct cpu_dbs_info_s *dbs_info;
+
+ dbs_info = &per_cpu(cpu_dbs_info, cpu);
+ cur_nice = cputime64_sub(kstat_cpu(cpu).cpustat.nice,
+ dbs_info->prev_cpu_nice);
+ /*
+ * Assumption: nice time between sampling periods will be
+ * less than 2^32 jiffies for 32 bit sys
+ */
+ cur_nice_jiffies = (unsigned long)
+ cputime64_to_jiffies64(cur_nice);
+ dbs_info->prev_cpu_nice = kstat_cpu(cpu).cpustat.nice;
+ return idle_time + jiffies_to_usecs(cur_nice_jiffies);
+ }