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[1/6] cpuidle: Remove unnecessary current_clr_polling_and_test() from haltpoll

Message ID 20250102150201.21639-2-frederic@kernel.org
State New
Headers show
Series [1/6] cpuidle: Remove unnecessary current_clr_polling_and_test() from haltpoll | expand

Commit Message

Frederic Weisbecker Jan. 2, 2025, 3:01 p.m. UTC 
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(-)
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Patch

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;
 }