lib/tests/bitops_kunit.c

File Facts

System

Linux kernel

Corpus path

lib/tests/bitops_kunit.c

Extension

.c

Size

5555 bytes

Lines

206

Domain

Kernel Services

Bucket

lib

Inferred role

Kernel Services: implementation source

Status

source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

• Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/bitops.h
• linux/module.h
• kunit/test.h

Detected Declarations

• struct bitops_test_case
• struct order_test_case
• struct order_long_test_case
• enum bitops_fun
• function test_set_bit_clear_bit
• function test_change_bit
• function test_test_and_set_bit_test_and_clear_bit
• function test_test_and_change_bit
• function test_get_count_order
• function test_get_count_order_long

Annotated Snippet

struct bitops_test_case {
	const char *str;
	const long nr;
};

static struct bitops_test_case bitops_cases[] = {
	{
		.str = "BITOPS_4",
		.nr = BITOPS_4,
	},
	{
		.str = "BITOPS_7",
		.nr = BITOPS_7,
	},
	{
		.str = "BITOPS_11",
		.nr = BITOPS_11,
	},
	{
		.str = "BITOPS_31",
		.nr = BITOPS_31,
	},
	{
		.str = "BITOPS_88",
		.nr = BITOPS_88,
	},
};

KUNIT_ARRAY_PARAM_DESC(bitops, bitops_cases, str);

static void test_set_bit_clear_bit(struct kunit *test)
{
	const struct bitops_test_case *params = test->param_value;
	DECLARE_BITMAP(bitmap, BITOPS_LENGTH);
	int bit_set;

	bitmap_zero(bitmap, BITOPS_LENGTH);

	set_bit(params->nr, bitmap);
	KUNIT_EXPECT_TRUE(test, test_bit(params->nr, bitmap));

	clear_bit(params->nr, bitmap);
	KUNIT_EXPECT_FALSE(test, test_bit(params->nr, bitmap));

	bit_set = find_first_bit(bitmap, BITOPS_LENGTH);
	KUNIT_EXPECT_EQ(test, bit_set, BITOPS_LENGTH);
}

static void test_change_bit(struct kunit *test)
{
	const struct bitops_test_case *params = test->param_value;
	DECLARE_BITMAP(bitmap, BITOPS_LENGTH);
	int bit_set;

	bitmap_zero(bitmap, BITOPS_LENGTH);

	change_bit(params->nr, bitmap);
	KUNIT_EXPECT_TRUE(test, test_bit(params->nr, bitmap));

	change_bit(params->nr, bitmap);
	KUNIT_EXPECT_FALSE(test, test_bit(params->nr, bitmap));

	bit_set = find_first_bit(bitmap, BITOPS_LENGTH);
	KUNIT_EXPECT_EQ(test, bit_set, BITOPS_LENGTH);
}

static void test_test_and_set_bit_test_and_clear_bit(struct kunit *test)
{
	const struct bitops_test_case *params = test->param_value;
	DECLARE_BITMAP(bitmap, BITOPS_LENGTH);
	int bit_set;

	bitmap_zero(bitmap, BITOPS_LENGTH);

	KUNIT_EXPECT_FALSE(test, test_and_set_bit(params->nr, bitmap));
	KUNIT_EXPECT_TRUE(test, test_bit(params->nr, bitmap));

	KUNIT_EXPECT_TRUE(test, test_and_set_bit(params->nr, bitmap));
	KUNIT_EXPECT_TRUE(test, test_bit(params->nr, bitmap));

	KUNIT_EXPECT_TRUE(test, test_and_clear_bit(params->nr, bitmap));
	KUNIT_EXPECT_FALSE(test, test_bit(params->nr, bitmap));

	KUNIT_EXPECT_FALSE(test, test_and_clear_bit(params->nr, bitmap));
	KUNIT_EXPECT_FALSE(test, test_bit(params->nr, bitmap));

	bit_set = find_first_bit(bitmap, BITOPS_LENGTH);
	KUNIT_EXPECT_EQ(test, bit_set, BITOPS_LENGTH);
}

Annotation

• Immediate include surface: `linux/bitops.h`, `linux/module.h`, `kunit/test.h`.
• Detected declarations: `struct bitops_test_case`, `struct order_test_case`, `struct order_long_test_case`, `enum bitops_fun`, `function test_set_bit_clear_bit`, `function test_change_bit`, `function test_test_and_set_bit_test_and_clear_bit`, `function test_test_and_change_bit`, `function test_get_count_order`, `function test_get_count_order_long`.
• Atlas domain: Kernel Services / lib.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.