[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>
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 06054c9..1b7fcd5 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -424,15 +424,19 @@
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)
