linux-kernel - [tip: irq/core] genirq/test: Ensure CPU 1 is online for hotplug test

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Message-ID: <175691234688.1920.17485143048251122696.tip-bot2@tip-bot2>
Date: Wed, 03 Sep 2025 15:12:26 -0000
From: "tip-bot2 for Brian Norris" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Guenter Roeck <linux@...ck-us.net>,
 Brian Norris <briannorris@...omium.org>, Thomas Gleixner <tglx@...utronix.de>,
 David Gow <davidgow@...gle.com>, x86@...nel.org, linux-kernel@...r.kernel.org,
 maz@...nel.org
Subject: [tip: irq/core] genirq/test: Ensure CPU 1 is online for hotplug test

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     8ad25ebfa70e86860559b306bbc923c7db4fcac6
Gitweb:        https://git.kernel.org/tip/8ad25ebfa70e86860559b306bbc923c7db4fcac6
Author:        Brian Norris <briannorris@...omium.org>
AuthorDate:    Fri, 22 Aug 2025 11:59:07 -07:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 03 Sep 2025 17:04:52 +02:00

genirq/test: Ensure CPU 1 is online for hotplug test

It's possible to run these tests on platforms that think they have a
hotpluggable CPU1, but for whatever reason, CPU1 is not online and can't be
brought online:

    # irq_cpuhotplug_test: EXPECTATION FAILED at kernel/irq/irq_test.c:210
    Expected remove_cpu(1) == 0, but
        remove_cpu(1) == 1 (0x1)
CPU1: failed to boot: -38
    # irq_cpuhotplug_test: EXPECTATION FAILED at kernel/irq/irq_test.c:214
    Expected add_cpu(1) == 0, but
        add_cpu(1) == -38 (0xffffffffffffffda)

Check that CPU1 is actually online before trying to run the test.

Fixes: 66067c3c8a1e ("genirq: Add kunit tests for depth counts")
Reported-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Brian Norris <briannorris@...omium.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: David Gow <davidgow@...gle.com>
Link: https://lore.kernel.org/all/20250822190140.2154646-7-briannorris@chromium.org

---
 kernel/irq/irq_test.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/irq/irq_test.c b/kernel/irq/irq_test.c
index bbb89a3..e2d3191 100644
--- a/kernel/irq/irq_test.c
+++ b/kernel/irq/irq_test.c
@@ -179,6 +179,8 @@ static void irq_cpuhotplug_test(struct kunit *test)
 		kunit_skip(test, "requires more than 1 CPU for CPU hotplug");
 	if (!cpu_is_hotpluggable(1))
 		kunit_skip(test, "CPU 1 must be hotpluggable");
+	if (!cpu_online(1))
+		kunit_skip(test, "CPU 1 must be online");
 
 	cpumask_copy(&affinity.mask, cpumask_of(1));