linux-kernel - Re: [PATCH v2 6/6] genirq/test: Ensure CPU 1 is online for hotplug test

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Message-ID: <480daaea-a5e5-4e93-bab2-91ac6edc0213@roeck-us.net>
Date: Fri, 22 Aug 2025 18:14:03 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Brian Norris <briannorris@...omium.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, David Gow <davidgow@...gle.com>,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	kunit-dev@...glegroups.com
Subject: Re: [PATCH v2 6/6] genirq/test: Ensure CPU 1 is online for hotplug
 test

On Fri, Aug 22, 2025 at 11:59:07AM -0700, Brian Norris wrote:
> 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>
> Reviewed-by: David Gow <davidgow@...gle.com>

Tested-by: Guenter Roeck <linux@...ck-us.net>

> ---
> 
> (no changes since v1)
> 
>  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 bbb89a3e1153..e2d31914b3c4 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));
>  
> -- 
> 2.51.0.rc2.233.g662b1ed5c5-goog
>