acpi_pad: uses MONITOR/MWAIT, so it doesn't need to clear TS_POLLING

api_pad exclusively uses MONITOR/MWAIT to sleep in idle,
so it does not need the wakeup IPI during idle sleep
that is provoked by clearing TS_POLLING.

Signed-off-by: Len Brown <len.brown@intel.com>
Cc: Shaohua Li <shaohua.li@intel.com>

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 6212213..7edf053 100644 (file)
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -168,13 +168,6 @@ static int power_saving_thread(void *data)
 
                do_sleep = 0;
 
-               current_thread_info()->status &= ~TS_POLLING;
-               /*
-                * TS_POLLING-cleared state must be visible before we test
-                * NEED_RESCHED:
-                */
-               smp_mb();
-
                expire_time = jiffies + HZ * (100 - idle_pct) / 100;
 
                while (!need_resched()) {
@@ -200,8 +193,6 @@ static int power_saving_thread(void *data)
                        }
                }
 
-               current_thread_info()->status |= TS_POLLING;
-
                /*
                 * current sched_rt has threshold for rt task running time.
                 * When a rt task uses 95% CPU time, the rt thread will be