linux-kernel - [PATCH 2/3] clockevents/arm_global_timer: Implement ->set_state_oneshot

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Message-Id: <e50fc01132e229071993d674c22e55cc14e30ffa.1450869375.git.viresh.kumar@linaro.org>
Date:	Wed, 23 Dec 2015 16:59:13 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	kernel@...inux.com (open list:ARM/STI ARCHITECTURE),
	linux-arm-kernel@...ts.infradead.org (moderated list:ARM/STI
	ARCHITECTURE), Maxime Coquelin <maxime.coquelin@...com>,
	Patrice Chotard <patrice.chotard@...com>,
	Srinivas Kandagatla <srinivas.kandagatla@...il.com>
Subject: [PATCH 2/3] clockevents/arm_global_timer: Implement ->set_state_oneshot_stopped()

set_state_oneshot_stopped() is called by the clkevt core, when the next
event is required at an expiry time of 'KTIME_MAX'. This normally
happens with NO_HZ_{IDLE|FULL} in both LOWRES/HIGHRES modes.

This patch makes the clockevent device to stop on such an event, to
avoid spurious interrupts, as explained by: commit 8fff52fd5093
("clockevents: Introduce CLOCK_EVT_STATE_ONESHOT_STOPPED state").

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
 drivers/clocksource/arm_global_timer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c
index a2cb6fae9295..801cfe5833c1 100644
--- a/drivers/clocksource/arm_global_timer.c
+++ b/drivers/clocksource/arm_global_timer.c
@@ -174,6 +174,7 @@ static int gt_clockevents_init(struct clock_event_device *clk)
 	clk->set_state_shutdown = gt_clockevent_shutdown;
 	clk->set_state_periodic = gt_clockevent_set_periodic;
 	clk->set_state_oneshot = gt_clockevent_shutdown;
+	clk->set_state_oneshot_stopped = gt_clockevent_shutdown;
 	clk->set_next_event = gt_clockevent_set_next_event;
 	clk->cpumask = cpumask_of(cpu);
 	clk->rating = 300;
-- 
2.7.0.rc1.186.g94414c4

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