[PATCH v2 3/7] clocksource/drivers/exynos_mct: Set local timer interrupts as percpu

Will McVicker
2025-04-03T00:01:27Z

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

To allow the CPU to handle it's own clock events, we need to set the
IRQF_PERCPU flag. This prevents the local timer interrupts from
migrating to other CPUs.

Signed-off-by: Hosung Kim <hosung0.kim@samsung.com>
[Original commit from https://android.googlesource.com/kernel/gs/+/03267fad19f093bac979ca78309483e9eb3a8d16]
Signed-off-by: Will McVicker <willmcvicker@google.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 96361d5dc57d..a5ef7d64b1c2 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -596,7 +596,8 @@ 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