[PATCH] clocksource/drivers/exynos_mct: Use percpu interrupts only on ARM64
From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: 2025-08-27 11:10:12
Also in:
linux-samsung-soc
Subsystem:
clocksource, clockevent drivers, the rest · Maintainers:
Daniel Lezcano, Thomas Gleixner, Linus Torvalds
For some unknown reasons forcing percpu interrupts for local timers
breaks CPU hotplug for 'little' cores on legacy ARM 32bit Exynos based
machines (for example Exynos5422-based Odroid-XU3/XU4 boards). Use percpu
flag only when driver is compiled for newer ARM64 architecture.
Fixes: f3cec54ee3bf ("clocksource/drivers/exynos_mct: Set local timer interrupts as percpu")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.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 62febeb4e1de..fece6bbc190e 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c@@ -603,7 +603,8 @@ static int __init exynos4_timer_interrupts(struct device_node *np, if (request_irq(mct_irq, exynos4_mct_tick_isr, IRQF_TIMER | IRQF_NOBALANCING | - IRQF_PERCPU, + (IS_ENABLED(CONFIG_ARM64) ? + IRQF_PERCPU : 0), pcpu_mevt->name, pcpu_mevt)) { pr_err("exynos-mct: cannot register IRQ (cpu%d)\n", cpu);
--
2.34.1