[ACPI] Make the bm_activity depend on "jiffies", instead of numbers

of the check being called. This means bus mastering activity
is assumed if bm_check isn't called; and multiple calls during
one jiffy will be |='ed.
Signed-off-by: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/processor_idle.c

@@ -193,8 +193,18 @@ static void acpi_processor_idle (void)
 	 */
 	if (pr->flags.bm_check) {
 		u32		bm_status = 0;
+		unsigned long	diff = jiffies - pr->power.bm_check_timestamp;
 
-		pr->power.bm_activity <<= 1;
+		if (diff > 32)
+			diff = 32;
+
+		while (diff) {
+			/* if we didn't get called, assume there was busmaster activity */
+			diff--;
+			if (diff)
+				pr->power.bm_activity |= 0x1;
+			pr->power.bm_activity <<= 1;
+		}
 
 		acpi_get_register(ACPI_BITREG_BUS_MASTER_STATUS,
 			&bm_status, ACPI_MTX_DO_NOT_LOCK);
@@ -213,6 +223,9 @@ static void acpi_processor_idle (void)
 				|| (inb_p(errata.piix4.bmisx + 0x0A) & 0x01))
 				pr->power.bm_activity++;
 		}
+
+		pr->power.bm_check_timestamp = jiffies;
+
 		/*
 		 * Apply bus mastering demotion policy.  Automatically demote
 		 * to avoid a faulty transition.  Note that the processor

include/acpi/processor.h

@@ -54,6 +54,7 @@ struct acpi_processor_cx {
 
 struct acpi_processor_power {
 	struct acpi_processor_cx *state;
+	unsigned long		bm_check_timestamp;
 	u32			default_state;
 	u32			bm_activity;
 	int			count;