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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: linux-kernel@vger.kernel.org, rcu@vger.kernel.org
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
	Anna-Maria Behnsen <anna-maria@linutronix.de>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Frederic Weisbecker <frederic@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Josh Triplett <josh@joshtriplett.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH v2 1/3] hrtimer: Use __raise_softirq_irqoff() to raise the softirq.
Date: Thu, 24 Oct 2024 16:55:49 +0200	[thread overview]
Message-ID: <20241024150413.518862-2-bigeasy@linutronix.de> (raw)
In-Reply-To: <20241024150413.518862-1-bigeasy@linutronix.de>

As an optimisation use __raise_softirq_irqoff() to raise the softirq.
This is always called from an interrupt handler 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@linutronix.de>
---
 kernel/time/hrtimer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index cddcd08ea827f..5402e0f242178 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1811,7 +1811,7 @@ void hrtimer_interrupt(struct clock_event_device *dev)
 	if (!ktime_before(now, cpu_base->softirq_expires_next)) {
 		cpu_base->softirq_expires_next = KTIME_MAX;
 		cpu_base->softirq_activated = 1;
-		raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+		__raise_softirq_irqoff(HRTIMER_SOFTIRQ);
 	}
 
 	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD);
@@ -1906,7 +1906,7 @@ void hrtimer_run_queues(void)
 	if (!ktime_before(now, cpu_base->softirq_expires_next)) {
 		cpu_base->softirq_expires_next = KTIME_MAX;
 		cpu_base->softirq_activated = 1;
-		raise_softirq_irqoff(HRTIMER_SOFTIRQ);
+		__raise_softirq_irqoff(HRTIMER_SOFTIRQ);
 	}
 
 	__hrtimer_run_queues(cpu_base, now, flags, HRTIMER_ACTIVE_HARD);
-- 
2.45.2


  reply	other threads:[~2024-10-24 15:04 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-10-24 14:55 [PATCH v2 0/3] softirq: Use a dedicated thread for timer wakeups on PREEMPT_RT Sebastian Andrzej Siewior
2024-10-24 14:55 ` Sebastian Andrzej Siewior [this message]
2024-10-28 13:11   ` [PATCH v2 1/3] hrtimer: Use __raise_softirq_irqoff() to raise the softirq Frederic Weisbecker
2024-10-24 14:55 ` [PATCH v2 2/3] timers: " Sebastian Andrzej Siewior
2024-10-28 13:13   ` Frederic Weisbecker
2024-10-24 14:55 ` [PATCH v2 3/3] softirq: Use a dedicated thread for timer wakeups on PREEMPT_RT Sebastian Andrzej Siewior
2024-10-28 14:01   ` Frederic Weisbecker
2024-10-29 13:52     ` Sebastian Andrzej Siewior
2024-10-29 21:47       ` Frederic Weisbecker
2024-10-30 10:02         ` Sebastian Andrzej Siewior

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