linux-kernel - [PATCH v2 4/6] genirq/test: Depend on SPARSE

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Message-ID: <20250822190140.2154646-5-briannorris@chromium.org>
Date: Fri, 22 Aug 2025 11:59:05 -0700
From: Brian Norris <briannorris@...omium.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: David Gow <davidgow@...gle.com>,
	linux-kernel@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	kunit-dev@...glegroups.com,
	Brian Norris <briannorris@...omium.org>
Subject: [PATCH v2 4/6] genirq/test: Depend on SPARSE_IRQ

Some architectures have a rather static IRQ layout, with a limited
NR_IRQS. Without SPARSE_IRQ, we may not be able to allocate any new fake
IRQs, and the test will fail. (This occurs on ARCH=m68k, for example.)

Additionally, managed-affinity is only supported with
CONFIG_SPARSE_IRQ=y, so irq_shutdown_depth_test() and
irq_cpuhotplug_test() would fail without it.

Add a 'SPARSE_IRQ' dependency to avoid these problems.

Many architectures 'select SPARSE_IRQ', so this is easy to miss.

Notably, this also excludes ARCH=um from running any of these tests,
even though some of them might work.

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>
---

Changes in v2:
 * Make all tests depend on SPARSE_IRQ, not just a few (resolves
   ARCH=m68k issues)

 kernel/irq/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
index 08088b8e95ae..a75df2bb9db6 100644
--- a/kernel/irq/Kconfig
+++ b/kernel/irq/Kconfig
@@ -147,6 +147,7 @@ config GENERIC_IRQ_KEXEC_CLEAR_VM_FORWARD
 config IRQ_KUNIT_TEST
 	bool "KUnit tests for IRQ management APIs" if !KUNIT_ALL_TESTS
 	depends on KUNIT=y
+	depends on SPARSE_IRQ
 	default KUNIT_ALL_TESTS
 	select IRQ_DOMAIN
 	imply SMP
-- 
2.51.0.rc2.233.g662b1ed5c5-goog