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-rw-r--r--drivers/cpuidle/cpuidle.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index c2dd99ab1648..2b8e6ce62e81 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -173,7 +173,7 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
struct cpuidle_state *target_state = &drv->states[index];
bool broadcast = !!(target_state->flags & CPUIDLE_FLAG_TIMER_STOP);
- ktime_t time_start, time_end;
+ u64 time_start, time_end;
s64 diff;
/*
@@ -195,13 +195,13 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
sched_idle_set_state(target_state);
trace_cpu_idle_rcuidle(index, dev->cpu);
- time_start = ktime_get();
+ time_start = local_clock();
stop_critical_timings();
entered_state = target_state->enter(dev, drv, index);
start_critical_timings();
- time_end = ktime_get();
+ time_end = local_clock();
trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, dev->cpu);
/* The cpu is no longer idle or about to enter idle. */
@@ -217,7 +217,11 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
if (!cpuidle_state_is_coupled(drv, entered_state))
local_irq_enable();
- diff = ktime_to_us(ktime_sub(time_end, time_start));
+ /*
+ * local_clock() returns the time in nanosecond, let's shift
+ * by 10 (divide by 1024) to have microsecond based time.
+ */
+ diff = (time_end - time_start) >> 10;
if (diff > INT_MAX)
diff = INT_MAX;