linux-kernel - Re: [PATCH 0/6] genirq/test: Platform/architecture fixes

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Message-ID: <aKYEVTRhzbXvwlbD@google.com>
Date: Wed, 20 Aug 2025 10:22:29 -0700
From: Brian Norris <briannorris@...omium.org>
To: David Gow <davidgow@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Guenter Roeck <linux@...ck-us.net>, linux-kernel@...r.kernel.org,
	kunit-dev@...glegroups.com
Subject: Re: [PATCH 0/6] genirq/test: Platform/architecture fixes

On Wed, Aug 20, 2025 at 03:00:34PM +0800, David Gow wrote:
> Looks like __irq_alloc_descs() is returning -ENOMEM (as
> irq_find_free_area() is returning 200 w/ nr_irqs == 200, and
> CONFIG_SPARSE_IRQ=n).

Thanks for the insight. I bothered compiling my own qemu just so I can
run m68k this time, and I can reproduce.

I wonder if I should make everything (CONFIG_IRQ_KUNIT_TEST) depend on
CONFIG_SPARSE_IRQ, since it seems like arches like m68k can't enable
SPARSE_IRQ, and they can't allocate new (fake) IRQs without it. That'd
be a tweak to patch 4.

Or maybe just 'depends on !M68K', since architectures with higher
NR_IRQS headroom may still work even without SPARSE_IRQ.

> But all of the other architectures I found worked okay, so this is at
> least an improvement.

Thanks for the testing.

Brian