From 84c407084137d4e491b07ea5ff8665d19106a5ac Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Wed, 4 Jun 2014 10:31:14 -0700 Subject: cpuidle: Set polling in poll_idle poll_idle is the archetypal polling idle loop; tell the core idle code about it. This avoids pointless IPIs when all of the other cpuidle states are disabled. Signed-off-by: Andy Lutomirski Signed-off-by: Peter Zijlstra Cc: nicolas.pitre@linaro.org Cc: umgwanakikbuti@gmail.com Cc: Daniel Lezcano Cc: Linus Torvalds Cc: Rafael J. Wysocki Cc: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Link: http://lkml.kernel.org/r/c65ce49615d338bae8fb79df5daffab19353c900.1401902905.git.luto@amacapital.net Signed-off-by: Ingo Molnar --- drivers/cpuidle/driver.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'drivers/cpuidle') diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c index 136d6a283e0a..9634f20e3926 100644 --- a/drivers/cpuidle/driver.c +++ b/drivers/cpuidle/driver.c @@ -187,8 +187,11 @@ static int poll_idle(struct cpuidle_device *dev, t1 = ktime_get(); local_irq_enable(); - while (!need_resched()) - cpu_relax(); + if (!current_set_polling_and_test()) { + while (!need_resched()) + cpu_relax(); + } + current_clr_polling(); t2 = ktime_get(); diff = ktime_to_us(ktime_sub(t2, t1)); -- cgit v1.2.3