[PATCH] ARM: Add VST idle loop call

This call allows the dynamic tick support to reprogram the timer
immediately before the CPU idles.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 3 deletions

diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 06054c9ba074..1b7fcd50c3e2 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -424,15 +424,19 @@ static int timer_dyn_tick_disable(void)
         return ret;
 }
 
+/*
+ * Reprogram the system timer for at least the calculated time interval.
+ * This function should be called from the idle thread with IRQs disabled,
+ * immediately before sleeping.
+ */
 void timer_dyn_reprogram(void)
 {
         struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
-        unsigned long flags;
 
-        write_seqlock_irqsave(&xtime_lock, flags);
+        write_seqlock(&xtime_lock);
         if (dyn_tick->state & DYN_TICK_ENABLED)
                 dyn_tick->reprogram(next_timer_interrupt() - jiffies);
-        write_sequnlock_irqrestore(&xtime_lock, flags);
+        write_sequnlock(&xtime_lock);
 }
 
 static ssize_t timer_show_dyn_tick(struct sys_device *dev, char *buf)