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Subject[PATCH 1/6] cpuidle: Remove unnecessary current_clr_polling_and_test() from haltpoll
Date
When cpuidle drivers ->enter() callback are called, the TIF_NR_POLLING
flag is cleared already and TIF_NEED_RESCHED checked by call_cpuidle().

Therefore calling current_clr_polling_and_test() is redundant here and
further setting of TIF_NEED_RESCHED will result in an IPI and thus an
idle loop exit. This call can be safely removed.

Cc: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
---
drivers/cpuidle/cpuidle-haltpoll.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/drivers/cpuidle/cpuidle-haltpoll.c b/drivers/cpuidle/cpuidle-haltpoll.c
index bcd03e893a0a..07dd9f000273 100644
--- a/drivers/cpuidle/cpuidle-haltpoll.c
+++ b/drivers/cpuidle/cpuidle-haltpoll.c
@@ -28,9 +28,6 @@ static enum cpuhp_state haltpoll_hp_state;
static __cpuidle int default_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
- if (current_clr_polling_and_test())
- return index;
-
arch_cpu_idle();
return index;
}
--
2.46.0

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