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From: David Gow <davidgow@google.com>
To: Shuah Khan <skhan@linuxfoundation.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>,
	Daniel Latypov <dlatypov@google.com>,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	kunit-dev@googlegroups.com
Subject: [PATCH v2 1/3] list: test: Add test for list_del_init_careful()
Date: Tue,  8 Feb 2022 12:01:21 +0800	[thread overview]
Message-ID: <20220208040122.695258-1-davidgow@google.com> (raw)

The list_del_init_careful() function was added[1] after the list KUnit
test. Add a very basic test to cover it.

Note that this test only covers the single-threaded behaviour (which
matches list_del_init()), as is already the case with the test for
list_empty_careful().

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6fe44d96fc1536af5b11cd859686453d1b7bfd1

Signed-off-by: David Gow <davidgow@google.com>
---

Changes since v1:
https://lore.kernel.org/linux-kselftest/20220205061539.273330-1-davidgow@google.com/
- Patch 1/3 unchanged

---
 lib/list-test.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/list-test.c b/lib/list-test.c
index ee09505df16f..976e9ae1f3c5 100644
--- a/lib/list-test.c
+++ b/lib/list-test.c
@@ -161,6 +161,24 @@ static void list_test_list_del_init(struct kunit *test)
 	KUNIT_EXPECT_TRUE(test, list_empty_careful(&a));
 }
 
+static void list_test_list_del_init_careful(struct kunit *test)
+{
+	/* This test doesn't check correctness under concurrent access */
+	struct list_head a, b;
+	LIST_HEAD(list);
+
+	list_add_tail(&a, &list);
+	list_add_tail(&b, &list);
+
+	/* before: [list] -> a -> b */
+	list_del_init(&a);
+	/* after: [list] -> b, a initialised */
+
+	KUNIT_EXPECT_PTR_EQ(test, list.next, &b);
+	KUNIT_EXPECT_PTR_EQ(test, b.prev, &list);
+	KUNIT_EXPECT_TRUE(test, list_empty_careful(&a));
+}
+
 static void list_test_list_move(struct kunit *test)
 {
 	struct list_head a, b;
@@ -707,6 +725,7 @@ static struct kunit_case list_test_cases[] = {
 	KUNIT_CASE(list_test_list_replace_init),
 	KUNIT_CASE(list_test_list_swap),
 	KUNIT_CASE(list_test_list_del_init),
+	KUNIT_CASE(list_test_list_del_init_careful),
 	KUNIT_CASE(list_test_list_move),
 	KUNIT_CASE(list_test_list_move_tail),
 	KUNIT_CASE(list_test_list_bulk_move_tail),
-- 
2.35.0.263.gb82422642f-goog


             reply	other threads:[~2022-02-08  4:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-08  4:01 David Gow [this message]
2022-02-08  4:01 ` [PATCH v2 2/3] list: test: Add a test for list_is_head() David Gow
2022-02-08 20:40   ` Daniel Latypov
2022-02-08 21:46   ` Brendan Higgins
2022-02-08  4:01 ` [PATCH v2 3/3] list: test: Add a test for list_entry_is_head() David Gow
2022-02-08 20:44   ` Daniel Latypov
2022-02-08 21:52   ` Brendan Higgins
2022-02-08 20:32 ` [PATCH v2 1/3] list: test: Add test for list_del_init_careful() Daniel Latypov

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