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| author | Andy Lutomirski <luto@amacapital.net> | 2014-06-04 10:31:14 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-06-05 12:09:49 +0200 |
| commit | 84c407084137d4e491b07ea5ff8665d19106a5ac (patch) | |
| tree | 39546e5d10871d68abef16efa1026958f9ce5132 /drivers/cpuidle | |
| parent | 0b07939cbfdd05bed0c5ec01b8b25493e6ecd34c (diff) | |
| download | lwn-84c407084137d4e491b07ea5ff8665d19106a5ac.tar.gz lwn-84c407084137d4e491b07ea5ff8665d19106a5ac.zip | |
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 <luto@amacapital.net>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: nicolas.pitre@linaro.org
Cc: umgwanakikbuti@gmail.com
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
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 <mingo@kernel.org>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/driver.c | 7 |
1 files changed, 5 insertions, 2 deletions
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)); |