[PATCH] clocksource/imx: allow timer irq affinity change

From	Lucas Stach <l.stach@pengutronix.de>
Newsgroups	linux.kernel
Subject	[PATCH] clocksource/imx: allow timer irq affinity change
Date	2015-10-14 11:30 +0200
Message-ID	<qjqxI-2DR-19@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Allow the timer core to change the smp affinity of the broadcast timer
irq by setting CLOCK_EVT_FEAT_DYNIRQ flag. For this to work the timer
core needs to be told about the used irq.

This reduces interrupt pressure and wakeups on CPU0 as well as vastly
reducing the number of timer broadcast IPIs.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/clocksource/timer-imx-gpt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/timer-imx-gpt.c b/drivers/clocksource/timer-imx-gpt.c
index 839aba92fc39..99ec96769dda 100644
--- a/drivers/clocksource/timer-imx-gpt.c
+++ b/drivers/clocksource/timer-imx-gpt.c
@@ -305,13 +305,14 @@ static int __init mxc_clockevent_init(struct imx_timer *imxtm)
 	struct irqaction *act = &imxtm->act;
 
 	ced->name = "mxc_timer1";
-	ced->features = CLOCK_EVT_FEAT_ONESHOT;
+	ced->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_DYNIRQ;
 	ced->set_state_shutdown = mxc_shutdown;
 	ced->set_state_oneshot = mxc_set_oneshot;
 	ced->tick_resume = mxc_shutdown;
 	ced->set_next_event = imxtm->gpt->set_next_event;
 	ced->rating = 200;
 	ced->cpumask = cpumask_of(0);
+	ced->irq = imxtm->irq;
 	clockevents_config_and_register(ced, clk_get_rate(imxtm->clk_per),
 					0xff, 0xfffffffe);
 
-- 
2.6.1

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[PATCH] clocksource/imx: allow timer irq affinity change Lucas Stach <l.stach@pengutronix.de> - 2015-10-14 11:30 +0200
  Re: [PATCH] clocksource/imx: allow timer irq affinity change Daniel Lezcano <daniel.lezcano@linaro.org> - 2015-10-15 17:50 +0200

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