From 37dc573c0a547e1aed0c9abb480fab797bd3833f Mon Sep 17 00:00:00 2001

From: David Gow <davidgow@google.com>

Date: Fri, 25 Feb 2022 10:52:48 +0800

Subject: [PATCH] list: test: Add a test for list_is_head()

Git-commit: 37dc573c0a547e1aed0c9abb480fab797bd3833f

Patch-mainline: v5.18-rc1

References: git-fixes

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@google.com>

Acked-by: Daniel Latypov <dlatypov@google.com>

Acked-by: Brendan Higgins <brendanhiggins@google.com>

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 lib/list-test.c | 19 +++++++++++++++++++

 1 file changed, 19 insertions(+)

diff --git a/lib/list-test.c b/lib/list-test.c

index 302b7382bff4..3870ebfd84aa 100644

--- a/lib/list-test.c

+++ b/lib/list-test.c

@@ -254,6 +254,24 @@ 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_MSG(test, list_is_head(&a, &a),

+		"Head element of same list");

+	KUNIT_EXPECT_FALSE_MSG(test, list_is_head(&a, &b),

+		"Non-head element of same list");

+	KUNIT_EXPECT_FALSE_MSG(test, list_is_head(&a, &c),

+		"Head element of different list");

+}

+

+

 static void list_test_list_is_first(struct kunit *test)

 {

 	struct list_head a, b;

@@ -731,6 +749,7 @@ 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),

-- 

2.35.3