linux-kernel - [PATCH v1 3/6] clocksource/drivers/exynos_mct: Set local timer interrupts as percpu

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Message-ID: <20250331230034.806124-4-willmcvicker@google.com>
Date: Mon, 31 Mar 2025 16:00:25 -0700
From: Will McVicker <willmcvicker@...gle.com>
To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Peter Griffin <peter.griffin@...aro.org>, 
	"André Draszik" <andre.draszik@...aro.org>, Tudor Ambarus <tudor.ambarus@...aro.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Alim Akhtar <alim.akhtar@...sung.com>, Daniel Lezcano <daniel.lezcano@...aro.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Saravana Kannan <saravanak@...gle.com>, 
	Krzysztof Kozlowski <krzk@...nel.org>
Cc: Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
	Hosung Kim <hosung0.kim@...sung.com>
Subject: [PATCH v1 3/6] clocksource/drivers/exynos_mct: Set local timer
 interrupts as percpu

From: Hosung Kim <hosung0.kim@...sung.com>

The MCT local timers can be used as a per-cpu event timer. To prevent
the timer interrupts from migrating to other CPUs, set the flag
IRQF_PERCPU.

Signed-off-by: Hosung Kim <hosung0.kim@...sung.com>
[Original commit from https://android.googlesource.com/kernel/gs/+/03267fad19f093bac979ca78309483e9eb3a8d16]
Signed-off-by: Will McVicker <willmcvicker@...gle.com>
---
 drivers/clocksource/exynos_mct.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 05c50f2f7a7e..21ded37137d7 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -590,7 +590,8 @@ static int __init exynos4_timer_interrupts(struct device_node *np,
 			irq_set_status_flags(mct_irq, IRQ_NOAUTOEN);
 			if (request_irq(mct_irq,
 					exynos4_mct_tick_isr,
-					IRQF_TIMER | IRQF_NOBALANCING,
+					IRQF_TIMER | IRQF_NOBALANCING |
+					IRQF_PERCPU,
 					pcpu_mevt->name, pcpu_mevt)) {
 				pr_err("exynos-mct: cannot register IRQ (cpu%d)\n",
 									cpu);
-- 
2.49.0.472.ge94155a9ec-goog