static unsigned long long monotonic_base;
static seqlock_t monotonic_lock = SEQLOCK_UNLOCKED;
+/* Avoid compensating for lost ticks before TSCs are synched */
+static int detect_lost_ticks;
+static int __init start_lost_tick_compensation(void)
+{
+ detect_lost_ticks = 1;
+ return 0;
+}
+late_initcall(start_lost_tick_compensation);
+
/* convert from cycles(64bits) => nanoseconds (64bits)
* basic equation:
* ns = cycles / (freq / ns_per_sec)
/* lost tick compensation */
offset = hpet_readl(HPET_T0_CMP) - hpet_tick;
- if (unlikely(((offset - hpet_last) > hpet_tick) && (hpet_last != 0))) {
+ if (unlikely(((offset - hpet_last) > hpet_tick) && (hpet_last != 0))
+ && detect_lost_ticks) {
int lost_ticks = (offset - hpet_last) / hpet_tick;
jiffies_64 += lost_ticks;
}
if (val != CPUFREQ_RESUMECHANGE)
write_seqlock_irq(&xtime_lock);
if (!ref_freq) {
+ if (!freq->old){
+ ref_freq = freq->new;
+ goto end;
+ }
ref_freq = freq->old;
loops_per_jiffy_ref = cpu_data[freq->cpu].loops_per_jiffy;
#ifndef CONFIG_SMP
#endif
}
+end:
if (val != CPUFREQ_RESUMECHANGE)
write_sequnlock_irq(&xtime_lock);
unsigned int cpu_khz_old = cpu_khz;
if (cpu_has_tsc) {
+ local_irq_disable();
init_cpu_khz();
+ local_irq_enable();
cpu_data[0].loops_per_jiffy =
cpufreq_scale(cpu_data[0].loops_per_jiffy,
cpu_khz_old,
delta += delay_at_last_interrupt;
lost = delta/(1000000/HZ);
delay = delta%(1000000/HZ);
- if (lost >= 2) {
+ if (lost >= 2 && detect_lost_ticks) {
jiffies_64 += lost-1;
/* sanity check to ensure we're not always losing ticks */