[PATCH] genirq/test: Fix depth tests on architectures with NOREQUEST by default.

[David Gow]

The new irq KUnit tests fail on some architectures (notably PowerPC and
32-bit ARM), as the request_irq() call fails due to the
ARCH_IRQ_INIT_FLAGS containing IRQ_NOREQUEST, yielding the following
errors:
[10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:88
[10:17:45] Expected ret == 0, but
[10:17:45] ret == -22 (0xffffffffffffffea)
[10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:90
[10:17:45] Expected desc->depth == 0, but
[10:17:45] desc->depth == 1 (0x1)
[10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:93
[10:17:45] Expected desc->depth == 1, but
[10:17:45] desc->depth == 2 (0x2)

If we clear IRQ_NOREQUEST from the desc, these tests now pass on arm and
powerpc.

Fixes: 66067c3c8a1e ("genirq: Add kunit tests for depth counts")
Signed-off-by: David Gow <davi...@google.com>
---
kernel/irq/irq_test.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/kernel/irq/irq_test.c b/kernel/irq/irq_test.c
index a75abebed7f2..e220e7b2fc18 100644
--- a/kernel/irq/irq_test.c
+++ b/kernel/irq/irq_test.c
@@ -54,6 +54,9 @@ static void irq_disable_depth_test(struct kunit *test)
desc = irq_to_desc(virq);
KUNIT_ASSERT_PTR_NE(test, desc, NULL);

+ /* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
+ irq_settings_clr_norequest(desc);
+
ret = request_irq(virq, noop_handler, 0, "test_irq", NULL);
KUNIT_EXPECT_EQ(test, ret, 0);

@@ -81,6 +84,9 @@ static void irq_free_disabled_test(struct kunit *test)
desc = irq_to_desc(virq);
KUNIT_ASSERT_PTR_NE(test, desc, NULL);

+ /* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
+ irq_settings_clr_norequest(desc);
+
ret = request_irq(virq, noop_handler, 0, "test_irq", NULL);
KUNIT_EXPECT_EQ(test, ret, 0);

@@ -120,6 +126,9 @@ static void irq_shutdown_depth_test(struct kunit *test)
desc = irq_to_desc(virq);
KUNIT_ASSERT_PTR_NE(test, desc, NULL);

+ /* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
+ irq_settings_clr_norequest(desc);
+
data = irq_desc_get_irq_data(desc);
KUNIT_ASSERT_PTR_NE(test, data, NULL);

@@ -180,6 +189,9 @@ static void irq_cpuhotplug_test(struct kunit *test)
desc = irq_to_desc(virq);
KUNIT_ASSERT_PTR_NE(test, desc, NULL);

+ /* On some architectures, IRQs are NOREQUEST | NOPROBE by default. */
+ irq_settings_clr_norequest(desc);
+
data = irq_desc_get_irq_data(desc);
KUNIT_ASSERT_PTR_NE(test, data, NULL);

--
2.51.0.rc1.167.g924127e9c0-goog

[Guenter Roeck]

On 8/16/25 02:45, David Gow wrote:
> The new irq KUnit tests fail on some architectures (notably PowerPC and
> 32-bit ARM), as the request_irq() call fails due to the
> ARCH_IRQ_INIT_FLAGS containing IRQ_NOREQUEST, yielding the following
> errors:
> [10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:88
> [10:17:45] Expected ret == 0, but
> [10:17:45] ret == -22 (0xffffffffffffffea)
> [10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:90
> [10:17:45] Expected desc->depth == 0, but
> [10:17:45] desc->depth == 1 (0x1)
> [10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:93
> [10:17:45] Expected desc->depth == 1, but
> [10:17:45] desc->depth == 2 (0x2)
>
> If we clear IRQ_NOREQUEST from the desc, these tests now pass on arm and
> powerpc.
>
> Fixes: 66067c3c8a1e ("genirq: Add kunit tests for depth counts")
> Signed-off-by: David Gow <davi...@google.com>

This doesn't completely fix the problems with the code, but it is a start.

From:

Unit test results:
pass: 640019 fail: 652

to:

Unit test results:
pass: 640559 fail: 114

Above tests now pass for most architectures/platforms, so

Tested-by: Guenter Roeck <li...@roeck-us.net>

Detailed test results are at https://kerneltests.org/builders in the "testing"
column in case anyone wants to have a look.

Guenter

[Brian Norris]

On Sat, Aug 16, 2025 at 05:45:28PM +0800, David Gow wrote:
> The new irq KUnit tests fail on some architectures (notably PowerPC and
> 32-bit ARM), as the request_irq() call fails due to the
> ARCH_IRQ_INIT_FLAGS containing IRQ_NOREQUEST, yielding the following
> errors:
> [10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:88
> [10:17:45] Expected ret == 0, but
> [10:17:45] ret == -22 (0xffffffffffffffea)
> [10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:90
> [10:17:45] Expected desc->depth == 0, but
> [10:17:45] desc->depth == 1 (0x1)
> [10:17:45] # irq_free_disabled_test: EXPECTATION FAILED at kernel/irq/irq_test.c:93
> [10:17:45] Expected desc->depth == 1, but
> [10:17:45] desc->depth == 2 (0x2)
>
> If we clear IRQ_NOREQUEST from the desc, these tests now pass on arm and
> powerpc.
>
> Fixes: 66067c3c8a1e ("genirq: Add kunit tests for depth counts")
> Signed-off-by: David Gow <davi...@google.com>

I was about to send essentially the same patch. Works for me.

Reviewed-by: Brian Norris <brian...@chromium.org>
Tested-by: Brian Norris <brian...@chromium.org>

tools/testing/kunit/kunit.py run 'irq_test_cases*' --arch arm \
--qemu_args '-smp 2' --cross_compile arm-linux-gnueabi-
...
[09:44:15] Testing complete. Ran 4 tests: passed: 4