lib/uuid_kunit: add tests for the four random UUID/GUID generators

2026-05-29T04:24:58+00:00

uuid_kunit currently exercises only guid_parse() and uuid_parse() (plus their invalid-input paths). The four random generators exported from lib/uuid.c -- generate_random_uuid(), generate_random_guid(), uuid_gen() and guid_gen() -- have no direct kunit coverage. Random output cannot be compared against a fixed expected value, but RFC 4122 section 4.4 specifies two invariants that any version-4 random UUID/GUID must satisfy: - version 4 in the high nibble of the version byte (byte 6 in the wire uuid_t layout, byte 7 in the byte-swapped guid_t layout); - variant DCE 1.1 (binary 10x) in the high bits of byte 8. Add four test cases that invoke each generator several times and verify these bit patterns hold. The same checks catch a regression in either the mask/OR sequence in the generators or the layout constants. Run the loop a handful of times to cover the small but non-zero chance that an unmasked random byte happens to satisfy the version/variant pattern by accident on a single call. Link: https://lore.kernel.org/20260516120915.40544-1-sozdayvek@gmail.com Signed-off-by: Stepan Ionichev Acked-by: Andy Shevchenko Cc: Brendan Higgins Cc: David Gow Cc: Greg Kroah-Hartman Signed-off-by: Andrew Morton

lib/tests: convert test_uuid module to KUnit

2026-01-21T03:44:18+00:00

Move lib/test_uuid.c to lib/tests/uuid_kunit.c and convert it to use KUnit. This change switches the ad-hoc test code to standard KUnit test cases. The test data remains the same, but the verification logic is updated to use KUNIT_EXPECT_* macros. Also remove CONFIG_TEST_UUID from arch/*/configs/* because it is no longer used. The new CONFIG_UUID_KUNIT_TEST will be automatically enabled by CONFIG_KUNIT_ALL_TESTS. [lukas.bulwahn@redhat.com: MAINTAINERS: adjust file entry in UUID HELPERS] Link: https://lkml.kernel.org/r/20251217053907.2778515-1-lukas.bulwahn@redhat.com Link: https://lkml.kernel.org/r/20251215134322.12949-1-sakamo.ryota@gmail.com Signed-off-by: Ryota Sakamoto Signed-off-by: Lukas Bulwahn Acked-by: Geert Uytterhoeven Reviewed-by: David Gow Cc: Andriy Shevchenko Cc: Brendan Higgins Cc: Lukas Bulwahn Signed-off-by: Andrew Morton

kernel/linux.git/lib/tests/uuid_kunit.c, branch v7.2-rc2

lib/uuid_kunit: add tests for the four random UUID/GUID generators

lib/tests: convert test_uuid module to KUnit