linux-kernel - [tip: timers/clocksource] clocksource/drivers/exynos_mct: Set local timer interrupts as percpu

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Message-ID: <175325504872.1420.16470158595930821063.tip-bot2@tip-bot2>
Date: Wed, 23 Jul 2025 07:17:28 -0000
From: "tip-bot2 for Hosung Kim" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Hosung Kim <hosung0.kim@...sung.com>,
 Peter Griffin <peter.griffin@...aro.org>,
 Youngmin Nam <youngmin.nam@...sung.com>,
 Will McVicker <willmcvicker@...gle.com>,
 Daniel Lezcano <daniel.lezcano@...aro.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: timers/clocksource] clocksource/drivers/exynos_mct: Set local
 timer interrupts as percpu

The following commit has been merged into the timers/clocksource branch of tip:

Commit-ID:     10934da577f627a97db18cf05dbe0c3c1b4a68d6
Gitweb:        https://git.kernel.org/tip/10934da577f627a97db18cf05dbe0c3c1b4a68d6
Author:        Hosung Kim <hosung0.kim@...sung.com>
AuthorDate:    Fri, 20 Jun 2025 11:17:06 -07:00
Committer:     Daniel Lezcano <daniel.lezcano@...aro.org>
CommitterDate: Tue, 15 Jul 2025 13:00:50 +02:00

clocksource/drivers/exynos_mct: Set local timer interrupts as percpu

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@...sung.com>
[Original commit from https://android.googlesource.com/kernel/gs/+/03267fad19f093bac979ca78309483e9eb3a8d16]
Reviewed-by: Peter Griffin <peter.griffin@...aro.org>
Reviewed-by: Youngmin Nam <youngmin.nam@...sung.com>
Tested-by: Youngmin Nam <youngmin.nam@...sung.com>
Signed-off-by: Will McVicker <willmcvicker@...gle.com>
Link: https://lore.kernel.org/r/20250620181719.1399856-4-willmcvicker@google.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 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 96361d5..a5ef7d6 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);