linux-kernel - [PATCH v2 2/5] tick/broadcast: Split __tick_broadcast_oneshot

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Date:   Mon, 24 May 2021 23:18:15 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        John Stultz <john.stultz@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        kernel-team@...roid.com
Subject: [PATCH v2 2/5] tick/broadcast: Split __tick_broadcast_oneshot_control() into a helper

In preparation for adding support for per-cpu wakeup timers, split
_tick_broadcast_oneshot_control() into a helper function which deals
only with the broadcast timer management across idle transitions.

Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Lorenzo Colitti <lorenzo@...gle.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
 kernel/time/tick-broadcast.c | 33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index fb794ff4855e..f3f2f4ba4321 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -717,24 +717,16 @@ static void broadcast_shutdown_local(struct clock_event_device *bc,
 	clockevents_switch_state(dev, CLOCK_EVT_STATE_SHUTDOWN);
 }
 
-int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
+static int ___tick_broadcast_oneshot_control(enum tick_broadcast_state state,
+					     struct tick_device *td,
+					     int cpu)
 {
-	struct clock_event_device *bc, *dev;
-	int cpu, ret = 0;
+	struct clock_event_device *bc, *dev = td->evtdev;
+	int ret = 0;
 	ktime_t now;
 
-	/*
-	 * If there is no broadcast device, tell the caller not to go
-	 * into deep idle.
-	 */
-	if (!tick_broadcast_device.evtdev)
-		return -EBUSY;
-
-	dev = this_cpu_ptr(&tick_cpu_device)->evtdev;
-
 	raw_spin_lock(&tick_broadcast_lock);
 	bc = tick_broadcast_device.evtdev;
-	cpu = smp_processor_id();
 
 	if (state == TICK_BROADCAST_ENTER) {
 		/*
@@ -863,6 +855,21 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
 	return ret;
 }
 
+int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
+{
+	struct tick_device *td = this_cpu_ptr(&tick_cpu_device);
+	int cpu = smp_processor_id();
+
+	if (tick_broadcast_device.evtdev)
+		return ___tick_broadcast_oneshot_control(state, td, cpu);
+
+	/*
+	 * If there is no broadcast device, tell the caller not
+	 * to go into deep idle.
+	 */
+	return -EBUSY;
+}
+
 /*
  * Reset the one shot broadcast for a cpu
  *
-- 
2.31.1.818.g46aad6cb9e-goog