Commit-ID: 84c407084137d4e491b07ea5ff8665d19106a5ac Gitweb: http://git.kernel.org/tip/84c407084137d4e491b07ea5ff8665d19106a5ac Author: Andy Lutomirski <[email protected]> AuthorDate: Wed, 4 Jun 2014 10:31:14 -0700 Committer: Ingo Molnar <[email protected]> CommitDate: Thu, 5 Jun 2014 12:09:49 +0200
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 <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Cc: [email protected] Cc: [email protected] Cc: Daniel Lezcano <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Rafael J. Wysocki <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/c65ce49615d338bae8fb79df5daffab19353c900.1401902905.git.l...@amacapital.net Signed-off-by: Ingo Molnar <[email protected]> --- drivers/cpuidle/driver.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c index 136d6a2..9634f20 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)); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
