linux-kernel - [PATCH v10 01/20] timers: Restructure get_next_timer

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Message-Id: <20240115143743.27827-2-anna-maria@linutronix.de>
Date: Mon, 15 Jan 2024 15:37:24 +0100
From: Anna-Maria Behnsen <anna-maria@...utronix.de>
To: linux-kernel@...r.kernel.org
Cc: Peter Zijlstra <peterz@...radead.org>,
	John Stultz <jstultz@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Eric Dumazet <edumazet@...gle.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
	Arjan van de Ven <arjan@...radead.org>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Rik van Riel <riel@...riel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sebastian Siewior <bigeasy@...utronix.de>,
	Giovanni Gherdovich <ggherdovich@...e.cz>,
	Lukasz Luba <lukasz.luba@....com>,
	"Gautham R . Shenoy" <gautham.shenoy@....com>,
	Srinivas Pandruvada <srinivas.pandruvada@...el.com>,
	K Prateek Nayak <kprateek.nayak@....com>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>
Subject: [PATCH v10 01/20] timers: Restructure get_next_timer_interrupt()

get_next_timer_interrupt() contains two parts for the next timer interrupt
calculation. Those two parts are separated by forwarding the base
clock. But the second part does not depend on the forwarded base
clock.

Therefore restructure get_next_timer_interrupt() to keep things together
which belong together.

No functional change.

Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
---
 kernel/time/timer.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 352b161113cd..5f21db4fa3ca 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1937,12 +1937,6 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem)
 	if (base->next_expiry_recalc)
 		next_expiry_recalc(base);
 
-	/*
-	 * We have a fresh next event. Check whether we can forward the
-	 * base.
-	 */
-	__forward_timer_base(base, basej);
-
 	if (base->timers_pending) {
 		nextevt = base->next_expiry;
 
@@ -1960,6 +1954,12 @@ u64 get_next_timer_interrupt(unsigned long basej, u64 basem)
 		base->next_expiry = nextevt;
 	}
 
+	/*
+	 * We have a fresh next event. Check whether we can forward the
+	 * base.
+	 */
+	__forward_timer_base(base, basej);
+
 	/*
 	 * Base is idle if the next event is more than a tick away.
 	 *
-- 
2.39.2