linux-kernel - [PATCH 01/10] cpuidle/poll: Ensure IRQs stay disabled after cpuidle

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Date:   Fri, 3 Mar 2023 17:23:23 +0800
From:   Cheng-Jui Wang <cheng-jui.wang@...iatek.com>
To:     <stable@...r.kernel.org>, "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Cheng-Jui Wang <cheng-jui.wang@...iatek.com>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH 01/10] cpuidle/poll: Ensure IRQs stay disabled after cpuidle_state::enter() calls

From: Peter Zijlstra <peterz@...radead.org>

commit 5e26aa93391195a64871db5d96d7163f0062ca4f upstream.

Make cpuidle_state::enter() methods IRQ state invariant on exit.

Additionally make sure to use raw_local_irq_*() methods since this
cpuidle callback will be called with RCU already disabled.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Tested-by: Tony Lindgren <tony@...mide.com>
Tested-by: Ulf Hansson <ulf.hansson@...aro.org>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Reviewed-by: Frederic Weisbecker <frederic@...nel.org>
Link: https://lore.kernel.org/r/20230112195539.515253662@infradead.org
Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
Signed-off-by: Cheng-Jui Wang <cheng-jui.wang@...iatek.com>
---
 drivers/cpuidle/poll_state.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c
index f7e83613ae94..1f578ed09c73 100644
--- a/drivers/cpuidle/poll_state.c
+++ b/drivers/cpuidle/poll_state.c
@@ -17,7 +17,7 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev,
 
 	dev->poll_time_limit = false;
 
-	local_irq_enable();
+	raw_local_irq_enable();
 	if (!current_set_polling_and_test()) {
 		unsigned int loop_count = 0;
 		u64 limit;
@@ -36,6 +36,8 @@ static int __cpuidle poll_idle(struct cpuidle_device *dev,
 			}
 		}
 	}
+	raw_local_irq_disable();
+
 	current_clr_polling();
 
 	return index;
-- 
2.18.0