list_is_head() was added recently[1], and didn't have a KUnit test. The implementation is trivial, so it's not a particularly exciting test, but it'd be nice to get back to full coverage of the list functions. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/include/linux/list.h?id=0425473037db40d9e322631f2d4dc6ef51f97e88 Signed-off-by: David Gow <davidgow@xxxxxxxxxx> --- Changes since v1: https://lore.kernel.org/linux-kselftest/20220205061539.273330-2-davidgow@xxxxxxxxxx/ - Test both non-head elements of the same list and head elements of different lists. --- lib/list-test.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/lib/list-test.c b/lib/list-test.c index 976e9ae1f3c5..1960615d1a9f 100644 --- a/lib/list-test.c +++ b/lib/list-test.c @@ -252,6 +252,23 @@ static void list_test_list_bulk_move_tail(struct kunit *test) KUNIT_EXPECT_EQ(test, i, 2); } +static void list_test_list_is_head(struct kunit *test) +{ + struct list_head a, b, c; + + /* Two lists: [a] -> b, [c] */ + INIT_LIST_HEAD(&a); + INIT_LIST_HEAD(&c); + list_add_tail(&b, &a); + + KUNIT_EXPECT_TRUE(test, list_is_head(&a, &a)); + /* Non-head element of same list */ + KUNIT_EXPECT_FALSE(test, list_is_head(&a, &b)); + /* Head element of different list */ + KUNIT_EXPECT_FALSE(test, list_is_head(&a, &c)); +} + + static void list_test_list_is_first(struct kunit *test) { struct list_head a, b; @@ -729,6 +746,7 @@ static struct kunit_case list_test_cases[] = { KUNIT_CASE(list_test_list_move), KUNIT_CASE(list_test_list_move_tail), KUNIT_CASE(list_test_list_bulk_move_tail), + KUNIT_CASE(list_test_list_is_head), KUNIT_CASE(list_test_list_is_first), KUNIT_CASE(list_test_list_is_last), KUNIT_CASE(list_test_list_empty), -- 2.35.0.263.gb82422642f-goog
