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irq: Add KUnit test for refcounted interrupt enable/disable

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While making changes to the refcounted interrupt patch series, at some
point on my local branch I broke something and ended up writing some kunit
tests for testing refcounted interrupts as a result. So, let's include
these tests now that we have refcounted interrupts.

Signed-off-by: Lyude Paul <[email protected]>
Signed-off-by: Boqun Feng <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://patch.msgid.link/[email protected]
This commit is contained in:
Lyude Paul authored and Peter Zijlstra committed 2026-08-10 10:50:18 +02:00
1 parent e901c1510e
commit 07a88e2bcd
2 files changed
+110
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kernel/irq/Makefile
+1
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@@ -16,3 +16,4 @@ obj-$(CONFIG_SMP) += affinity.o
obj-$(CONFIG_GENERIC_IRQ_DEBUGFS) += debugfs.o
obj-$(CONFIG_GENERIC_IRQ_MATRIX_ALLOCATOR) += matrix.o
obj-$(CONFIG_IRQ_KUNIT_TEST) += irq_test.o
obj-$(CONFIG_KUNIT) += refcount_interrupt_test.o
kernel/irq/refcount_interrupt_test.c
+109
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@@ -0,0 +1,109 @@
// SPDX-License-Identifier: GPL-2.0
/*
* KUnit test for refcounted interrupt enable/disables.
*/
#include <kunit/test.h>
#include <linux/interrupt_rc.h>
#define TEST_IRQ_ON() KUNIT_EXPECT_FALSE(test, irqs_disabled())
#define TEST_IRQ_OFF() KUNIT_EXPECT_TRUE(test, irqs_disabled())
/* ===== Test cases ===== */
static void test_single_irq_change(struct kunit *test)
{
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_enable();
}
static void test_nested_irq_change(struct kunit *test)
{
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_ON();
}
static void test_multiple_irq_change(struct kunit *test)
{
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_ON();
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_ON();
}
static void test_irq_save(struct kunit *test)
{
unsigned long flags;
local_irq_save(flags);
TEST_IRQ_OFF();
local_interrupt_disable();
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_OFF();
local_irq_restore(flags);
TEST_IRQ_ON();
local_interrupt_disable();
TEST_IRQ_OFF();
local_irq_save(flags);
TEST_IRQ_OFF();
local_irq_restore(flags);
TEST_IRQ_OFF();
local_interrupt_enable();
TEST_IRQ_ON();
}
static struct kunit_case test_cases[] = {
KUNIT_CASE(test_single_irq_change),
KUNIT_CASE(test_nested_irq_change),
KUNIT_CASE(test_multiple_irq_change),
KUNIT_CASE(test_irq_save),
{},
};
/* init and exit are the same. */
static int test_init(struct kunit *test)
{
TEST_IRQ_ON();
return 0;
}
static void test_exit(struct kunit *test)
{
TEST_IRQ_ON();
}
static struct kunit_suite refcount_interrupt_test_suite = {
.name = "refcount_interrupt",
.test_cases = test_cases,
.init = test_init,
.exit = test_exit,
};
kunit_test_suite(refcount_interrupt_test_suite);
MODULE_AUTHOR("Lyude Paul <[email protected]>");
MODULE_DESCRIPTION("Refcounted interrupt unit test suite");
MODULE_LICENSE("GPL");