From 2ea83398b75309d8fdc999c4bb252e72d7e4fd9d Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 27 Jun 2005 14:04:05 +0100 Subject: [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 --- arch/arm/kernel/time.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'arch/arm/kernel/time.c') diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c index 06054c9ba07..1b7fcd50c3e 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) -- cgit v1.2.3