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cpuidle: Set polling in poll_idle

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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.luto@amacapital.net
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Andy Lutomirski 2014-06-04 10:31:14 -07:00 • committed by Ingo Molnar
commit 84c4070841
1 changed files with 5 additions and 2 deletions
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7
drivers/cpuidle/driver.c
View file

@ -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));