linux-kernel - [PATCH v2 2/3] timers: Use __raise_softirq

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Message-ID: <20241024150413.518862-3-bigeasy@linutronix.de>
Date: Thu, 24 Oct 2024 16:55:50 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org,
	rcu@...r.kernel.org
Cc: "Paul E. McKenney" <paulmck@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Davidlohr Bueso <dave@...olabs.net>,
	Frederic Weisbecker <frederic@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH v2 2/3] timers: Use __raise_softirq_irqoff() to raise the softirq.

As an optimisation use __raise_softirq_irqoff() to raise the softirq.
This is always called from an interrupt handler, interrupts are already
disabled so it can be reduced to just or set softirq flag and let
softirq be invoked on return from interrupt.

Use __raise_softirq_irqoff() to raise the softirq.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 kernel/time/timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 0fc9d066a7be4..1759de934284c 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -2499,7 +2499,7 @@ static void run_local_timers(void)
 		 */
 		if (time_after_eq(jiffies, READ_ONCE(base->next_expiry)) ||
 		    (i == BASE_DEF && tmigr_requires_handle_remote())) {
-			raise_softirq(TIMER_SOFTIRQ);
+			__raise_softirq_irqoff(TIMER_SOFTIRQ);
 			return;
 		}
 	}
-- 
2.45.2