cpuidle: reenable /proc/acpi/ power interface for the time being

Index: linux-2.6.22-rc-mm/drivers/acpi/processor_idle.c
===================================================================
@@ -792,7 +792,7 @@
  * @t1: the start time
  * @t2: the end time
  */
-static inline u32 ticks_elapsed(u32 t1, u32 t2)
+static inline u32 ticks_elapsed_in_us(u32 t1, u32 t2)
 {
 	if (t2 >= t1)
 		return PM_TIMER_TICKS_TO_US(t2 - t1);

@@ -802,6 +802,16 @@
 		return PM_TIMER_TICKS_TO_US((0xFFFFFFFF - t1) + t2);
 }
 
+static inline u32 ticks_elapsed(u32 t1, u32 t2)
+{
+	if (t2 >= t1)
+		return (t2 - t1);
+	else if (!(acpi_gbl_FADT.flags & ACPI_FADT_32BIT_TIMER))
+		return (((0x00FFFFFF - t1) + t2) & 0x00FFFFFF);
+	else
+		return ((0xFFFFFFFF - t1) + t2);
+}
+
 /**
  * acpi_idle_update_bm_rld - updates the BM_RLD bit depending on target state
  * @pr: the processor

@@ -925,7 +935,8 @@
 	cx->usage++;
 
 	acpi_state_timer_broadcast(pr, cx, 0);
-	return ticks_elapsed(t1, t2);
+	cx->time += ticks_elapsed(t1, t2);
+	return ticks_elapsed_in_us(t1, t2);
 }
 
 static int c3_cpu_count;

@@ -1009,7 +1020,8 @@
 	cx->usage++;
 
 	acpi_state_timer_broadcast(pr, cx, 0);
-	return ticks_elapsed(t1, t2);
+	cx->time += ticks_elapsed(t1, t2);
+	return ticks_elapsed_in_us(t1, t2);
 }
 
 /**