cpuidle / ACPI: remove usage from acpi_processor_cx structure

Remove the usage field as it is not used.
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

drivers/acpi/processor_idle.c

@@ -760,7 +760,6 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev,
 	dev->last_residency = (int)idle_time;
 
 	local_irq_enable();
-	cx->usage++;
 	lapic_timer_state_broadcast(pr, cx, 0);
 
 	return index;
@@ -863,8 +862,6 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
 	if (cx->entry_method != ACPI_CSTATE_FFH)
 		current_thread_info()->status |= TS_POLLING;
 
-	cx->usage++;
-
 	lapic_timer_state_broadcast(pr, cx, 0);
 	cx->time += idle_time;
 	return index;
@@ -984,8 +981,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
 	if (cx->entry_method != ACPI_CSTATE_FFH)
 		current_thread_info()->status |= TS_POLLING;
 
-	cx->usage++;
-
 	lapic_timer_state_broadcast(pr, cx, 0);
 	cx->time += idle_time;
 	return index;

include/acpi/processor.h

@@ -60,7 +60,6 @@ struct acpi_processor_cx {
 	u8 index;
 	u32 latency;
 	u32 power;
-	u32 usage;
 	u64 time;
 	u8 bm_sts_skip;
 	char desc[ACPI_CX_DESC_LEN];