Re: [PATCH linux-kselftest/test v2] lib/list-test: add a test for the 'list' doubly linked list

[shuah <shuah@kernel.org>]

Hi David,

On 10/10/19 12:56 PM, David Gow wrote:
> Add a KUnit test for the kernel doubly linked list implementation in
> include/linux/list.h
> 
> Each test case (list_test_x) is focused on testing the behaviour of the
> list function/macro 'x'. None of the tests pass invalid lists to these
> macros, and so should behave identically with DEBUG_LIST enabled and
> disabled.
> 
> Note that, at present, it only tests the list_ types (not the
> singly-linked hlist_), and does not yet test all of the
> list_for_each_entry* macros (and some related things like
> list_prepare_entry).
> 
> Signed-off-by: David Gow <davidgow@google.com>
> ---
> Addressed the various comments on v1. The biggest change is the renaming
> of all of the testcases from the form x_test to list_test_x. I'm not
> super happy with how that looks (not the least because it ends up with
> 'list' twice), but it is more consistent with the proc/sysctl tests.
> 
> 

I am sorry for commenting on this late. I have a comment on the config
option naming.

>   MAINTAINERS       |   5 +
>   lib/Kconfig.debug |  12 +
>   lib/Makefile      |   3 +
>   lib/list-test.c   | 738 ++++++++++++++++++++++++++++++++++++++++++++++
>   4 files changed, 758 insertions(+)
>   create mode 100644 lib/list-test.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7ef985e01457..9ccabdb25a26 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -9504,6 +9504,11 @@ F:	Documentation/misc-devices/lis3lv02d.rst
>   F:	drivers/misc/lis3lv02d/
>   F:	drivers/platform/x86/hp_accel.c
>   
> +LIST UNIT TEST
> +M:	David Gow <davidgow@google.com>
> +S:	Maintained
> +F:	lib/list-test.c
> +
>   LIVE PATCHING
>   M:	Josh Poimboeuf <jpoimboe@redhat.com>
>   M:	Jiri Kosina <jikos@kernel.org>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index a3017a5dadcd..7b648141ff52 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -1961,6 +1961,18 @@ config SYSCTL_KUNIT_TEST
>   
>   	  If unsure, say N.
>   
> +config LIST_TEST

It is a good idea to have KUNIT in the naming and it is consistent
with the ext4 test naming which is CONFIG_EXT4_KUNIT_TESTS

> +	bool "KUnit Test for Kernel Linked-list structures"
> +	depends on KUNIT
> +	help
> +	  This builds the linked list unit test, which runs on boot.

What happens if this fails - does the system boot. Please capture this
information here as well as in the commit log. I also would like to
wording similar to the what ext4 test - definitely the part about
"not for inclusion into a production build."

"KUnit tests run during boot and output the results to the debug log
in TAP format (http://testanything.org/). Only useful for kernel devs
running KUnit test harness and are not for inclusion into a production
build."


> +	  It tests that the API and basic functionality of the list_head type
> +	  and associated macros.
> +	  For more information on KUnit and unit tests in general please refer
> +	  to the KUnit documentation in Documentation/dev-tools/kunit/.
> +
> +	  If unsure, say N.
> +
>   config TEST_UDELAY
>   	tristate "udelay test driver"
>   	help
> diff --git a/lib/Makefile b/lib/Makefile
> index bba1fd5485f7..309e174ee35d 100644
> --- a/lib/Makefile
> +++ b/lib/Makefile
> @@ -292,3 +292,6 @@ obj-$(CONFIG_GENERIC_LIB_MULDI3) += muldi3.o
>   obj-$(CONFIG_GENERIC_LIB_CMPDI2) += cmpdi2.o
>   obj-$(CONFIG_GENERIC_LIB_UCMPDI2) += ucmpdi2.o
>   obj-$(CONFIG_OBJAGG) += objagg.o
> +
> +# KUnit tests
> +obj-$(CONFIG_LIST_TEST) += list-test.o
> diff --git a/lib/list-test.c b/lib/list-test.c
> new file mode 100644
> index 000000000000..52522ba83a68
> --- /dev/null
> +++ b/lib/list-test.c
> @@ -0,0 +1,738 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * KUnit test for the Kernel Linked-list structures.
> + *
> + * Copyright (C) 2019, Google LLC.
> + * Author: David Gow <davidgow@google.com>
> + */
> +#include <kunit/test.h>
> +
> +#include <linux/list.h>
> +
> +struct list_test_struct {
> +	int data;
> +	struct list_head list;
> +};
> +
> +static void list_test_list_init(struct kunit *test)
> +{
> +	/* Test the different ways of initialising a list. */
> +	struct list_head list1 = LIST_HEAD_INIT(list1);
> +	struct list_head list2;
> +	LIST_HEAD(list3);
> +	struct list_head *list4;
> +	struct list_head *list5;
> +
> +	INIT_LIST_HEAD(&list2);
> +
> +	list4 = kzalloc(sizeof(*list4), 0);
> +	INIT_LIST_HEAD(list4);
> +
> +	list5 = kmalloc(sizeof(*list5), 0);
> +	memset(list5, 0xFF, sizeof(*list5));
> +	INIT_LIST_HEAD(list5);
> +
> +	/* list_empty_careful() checks both next and prev. */
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(&list1));
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(&list2));
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(&list3));
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(list4));
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(list5));
> +
> +	kfree(list4);
> +	kfree(list5);
> +}
> +
> +static void list_test_list_add(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	list_add(&a, &list);
> +	list_add(&b, &list);
> +
> +	/* should be [list] -> b -> a */
> +	KUNIT_EXPECT_PTR_EQ(test, list.next, &b);
> +	KUNIT_EXPECT_PTR_EQ(test, b.prev, &list);
> +	KUNIT_EXPECT_PTR_EQ(test, b.next, &a);
> +}
> +
> +static void list_test_list_add_tail(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a, &list);
> +	list_add_tail(&b, &list);
> +
> +	/* should be [list] -> a -> b */
> +	KUNIT_EXPECT_PTR_EQ(test, list.next, &a);
> +	KUNIT_EXPECT_PTR_EQ(test, a.prev, &list);
> +	KUNIT_EXPECT_PTR_EQ(test, a.next, &b);
> +}
> +
> +static void list_test_list_del(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a, &list);
> +	list_add_tail(&b, &list);
> +
> +	/* before: [list] -> a -> b */
> +	list_del(&a);
> +
> +	/* now: [list] -> b */
> +	KUNIT_EXPECT_PTR_EQ(test, list.next, &b);
> +	KUNIT_EXPECT_PTR_EQ(test, b.prev, &list);
> +}
> +
> +static void list_test_list_replace(struct kunit *test)
> +{
> +	struct list_head a_old, a_new, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a_old, &list);
> +	list_add_tail(&b, &list);
> +
> +	/* before: [list] -> a_old -> b */
> +	list_replace(&a_old, &a_new);
> +
> +	/* now: [list] -> a_new -> b */
> +	KUNIT_EXPECT_PTR_EQ(test, list.next, &a_new);
> +	KUNIT_EXPECT_PTR_EQ(test, b.prev, &a_new);
> +}
> +
> +static void list_test_list_replace_init(struct kunit *test)
> +{
> +	struct list_head a_old, a_new, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a_old, &list);
> +	list_add_tail(&b, &list);
> +
> +	/* before: [list] -> a_old -> b */
> +	list_replace_init(&a_old, &a_new);
> +
> +	/* now: [list] -> a_new -> b */
> +	KUNIT_EXPECT_PTR_EQ(test, list.next, &a_new);
> +	KUNIT_EXPECT_PTR_EQ(test, b.prev, &a_new);
> +
> +	/* check a_old is empty (initialized) */
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(&a_old));
> +}
> +
> +static void list_test_list_swap(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a, &list);
> +	list_add_tail(&b, &list);
> +
> +	/* before: [list] -> a -> b */
> +	list_swap(&a, &b);
> +
> +	/* after: [list] -> b -> a */
> +	KUNIT_EXPECT_PTR_EQ(test, &b, list.next);
> +	KUNIT_EXPECT_PTR_EQ(test, &a, list.prev);
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &a, b.next);
> +	KUNIT_EXPECT_PTR_EQ(test, &list, b.prev);
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &list, a.next);
> +	KUNIT_EXPECT_PTR_EQ(test, &b, a.prev);
> +}
> +
> +static void list_test_list_del_init(struct kunit *test)
> +{
> +	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;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +
> +	list_add_tail(&a, &list1);
> +	list_add_tail(&b, &list2);
> +
> +	/* before: [list1] -> a, [list2] -> b */
> +	list_move(&a, &list2);
> +	/* after: [list1] empty, [list2] -> a -> b */
> +
> +	KUNIT_EXPECT_TRUE(test, list_empty(&list1));
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &a, list2.next);
> +	KUNIT_EXPECT_PTR_EQ(test, &b, a.next);
> +}
> +
> +static void list_test_list_move_tail(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +
> +	list_add_tail(&a, &list1);
> +	list_add_tail(&b, &list2);
> +
> +	/* before: [list1] -> a, [list2] -> b */
> +	list_move_tail(&a, &list2);
> +	/* after: [list1] empty, [list2] -> b -> a */
> +
> +	KUNIT_EXPECT_TRUE(test, list_empty(&list1));
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &b, list2.next);
> +	KUNIT_EXPECT_PTR_EQ(test, &a, b.next);
> +}
> +
> +static void list_test_list_bulk_move_tail(struct kunit *test)
> +{
> +	struct list_head a, b, c, d, x, y;
> +	struct list_head *list1_values[] = { &x, &b, &c, &y };
> +	struct list_head *list2_values[] = { &a, &d };
> +	struct list_head *ptr;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +	int i = 0;
> +
> +	list_add_tail(&x, &list1);
> +	list_add_tail(&y, &list1);
> +
> +	list_add_tail(&a, &list2);
> +	list_add_tail(&b, &list2);
> +	list_add_tail(&c, &list2);
> +	list_add_tail(&d, &list2);
> +
> +	/* before: [list1] -> x -> y, [list2] -> a -> b -> c -> d */
> +	list_bulk_move_tail(&y, &b, &c);
> +	/* after: [list1] -> x -> b -> c -> y, [list2] -> a -> d */
> +
> +	list_for_each(ptr, &list1) {
> +		KUNIT_EXPECT_PTR_EQ(test, ptr, list1_values[i]);
> +		i++;
> +	}
> +	KUNIT_EXPECT_EQ(test, i, 4);
> +	i = 0;
> +	list_for_each(ptr, &list2) {
> +		KUNIT_EXPECT_PTR_EQ(test, ptr, list2_values[i]);
> +		i++;
> +	}
> +	KUNIT_EXPECT_EQ(test, i, 2);
> +}
> +
> +static void list_test_list_is_first(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a, &list);
> +	list_add_tail(&b, &list);
> +
> +	KUNIT_EXPECT_TRUE(test, list_is_first(&a, &list));
> +	KUNIT_EXPECT_FALSE(test, list_is_first(&b, &list));
> +}
> +
> +static void list_test_list_is_last(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a, &list);
> +	list_add_tail(&b, &list);
> +
> +	KUNIT_EXPECT_FALSE(test, list_is_last(&a, &list));
> +	KUNIT_EXPECT_TRUE(test, list_is_last(&b, &list));
> +}
> +
> +static void list_test_list_empty(struct kunit *test)
> +{
> +	struct list_head a;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +
> +	list_add_tail(&a, &list1);
> +
> +	KUNIT_EXPECT_FALSE(test, list_empty(&list1));
> +	KUNIT_EXPECT_TRUE(test, list_empty(&list2));
> +}
> +
> +static void list_test_list_empty_careful(struct kunit *test)
> +{
> +	/* This test doesn't check correctness under concurrent access */
> +	struct list_head a;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +
> +	list_add_tail(&a, &list1);
> +
> +	KUNIT_EXPECT_FALSE(test, list_empty_careful(&list1));
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(&list2));
> +}
> +
> +static void list_test_list_rotate_left(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&a, &list);
> +	list_add_tail(&b, &list);
> +
> +	/* before: [list] -> a -> b */
> +	list_rotate_left(&list);
> +	/* after: [list] -> b -> a */
> +
> +	KUNIT_EXPECT_PTR_EQ(test, list.next, &b);
> +	KUNIT_EXPECT_PTR_EQ(test, b.prev, &list);
> +	KUNIT_EXPECT_PTR_EQ(test, b.next, &a);
> +}
> +
> +static void list_test_list_rotate_to_front(struct kunit *test)
> +{
> +	struct list_head a, b, c, d;
> +	struct list_head *list_values[] = { &c, &d, &a, &b };
> +	struct list_head *ptr;
> +	LIST_HEAD(list);
> +	int i = 0;
> +
> +	list_add_tail(&a, &list);
> +	list_add_tail(&b, &list);
> +	list_add_tail(&c, &list);
> +	list_add_tail(&d, &list);
> +
> +	/* before: [list] -> a -> b -> c -> d */
> +	list_rotate_to_front(&c, &list);
> +	/* after: [list] -> c -> d -> a -> b */
> +
> +	list_for_each(ptr, &list) {
> +		KUNIT_EXPECT_PTR_EQ(test, ptr, list_values[i]);
> +		i++;
> +	}
> +	KUNIT_EXPECT_EQ(test, i, 4);
> +}
> +
> +static void list_test_list_is_singular(struct kunit *test)
> +{
> +	struct list_head a, b;
> +	LIST_HEAD(list);
> +
> +	/* [list] empty */
> +	KUNIT_EXPECT_FALSE(test, list_is_singular(&list));
> +
> +	list_add_tail(&a, &list);
> +
> +	/* [list] -> a */
> +	KUNIT_EXPECT_TRUE(test, list_is_singular(&list));
> +
> +	list_add_tail(&b, &list);
> +
> +	/* [list] -> a -> b */
> +	KUNIT_EXPECT_FALSE(test, list_is_singular(&list));
> +}
> +
> +static void list_test_list_cut_position(struct kunit *test)
> +{
> +	struct list_head entries[3], *cur;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +	int i = 0;
> +
> +	list_add_tail(&entries[0], &list1);
> +	list_add_tail(&entries[1], &list1);
> +	list_add_tail(&entries[2], &list1);
> +
> +	/* before: [list1] -> entries[0] -> entries[1] -> entries[2] */
> +	list_cut_position(&list2, &list1, &entries[1]);
> +	/* after: [list2] -> entries[0] -> entries[1], [list1] -> entries[2] */
> +
> +	list_for_each(cur, &list2) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 2);
> +
> +	list_for_each(cur, &list1) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +}
> +
> +static void list_test_list_cut_before(struct kunit *test)
> +{
> +	struct list_head entries[3], *cur;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +	int i = 0;
> +
> +	list_add_tail(&entries[0], &list1);
> +	list_add_tail(&entries[1], &list1);
> +	list_add_tail(&entries[2], &list1);
> +
> +	/* before: [list1] -> entries[0] -> entries[1] -> entries[2] */
> +	list_cut_before(&list2, &list1, &entries[1]);
> +	/* after: [list2] -> entries[0], [list1] -> entries[1] -> entries[2] */
> +
> +	list_for_each(cur, &list2) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 1);
> +
> +	list_for_each(cur, &list1) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +}
> +
> +static void list_test_list_splice(struct kunit *test)
> +{
> +	struct list_head entries[5], *cur;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +	int i = 0;
> +
> +	list_add_tail(&entries[0], &list1);
> +	list_add_tail(&entries[1], &list1);
> +	list_add_tail(&entries[2], &list2);
> +	list_add_tail(&entries[3], &list2);
> +	list_add_tail(&entries[4], &list1);
> +
> +	/* before: [list1]->e[0]->e[1]->e[4], [list2]->e[2]->e[3] */
> +	list_splice(&list2, &entries[1]);
> +	/* after: [list1]->e[0]->e[1]->e[2]->e[3]->e[4], [list2] uninit */
> +
> +	list_for_each(cur, &list1) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 5);
> +}
> +
> +static void list_test_list_splice_tail(struct kunit *test)
> +{
> +	struct list_head entries[5], *cur;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +	int i = 0;
> +
> +	list_add_tail(&entries[0], &list1);
> +	list_add_tail(&entries[1], &list1);
> +	list_add_tail(&entries[2], &list2);
> +	list_add_tail(&entries[3], &list2);
> +	list_add_tail(&entries[4], &list1);
> +
> +	/* before: [list1]->e[0]->e[1]->e[4], [list2]->e[2]->e[3] */
> +	list_splice_tail(&list2, &entries[4]);
> +	/* after: [list1]->e[0]->e[1]->e[2]->e[3]->e[4], [list2] uninit */
> +
> +	list_for_each(cur, &list1) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 5);
> +}
> +
> +static void list_test_list_splice_init(struct kunit *test)
> +{
> +	struct list_head entries[5], *cur;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +	int i = 0;
> +
> +	list_add_tail(&entries[0], &list1);
> +	list_add_tail(&entries[1], &list1);
> +	list_add_tail(&entries[2], &list2);
> +	list_add_tail(&entries[3], &list2);
> +	list_add_tail(&entries[4], &list1);
> +
> +	/* before: [list1]->e[0]->e[1]->e[4], [list2]->e[2]->e[3] */
> +	list_splice_init(&list2, &entries[1]);
> +	/* after: [list1]->e[0]->e[1]->e[2]->e[3]->e[4], [list2] empty */
> +
> +	list_for_each(cur, &list1) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 5);
> +
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(&list2));
> +}
> +
> +static void list_test_list_splice_tail_init(struct kunit *test)
> +{
> +	struct list_head entries[5], *cur;
> +	LIST_HEAD(list1);
> +	LIST_HEAD(list2);
> +	int i = 0;
> +
> +	list_add_tail(&entries[0], &list1);
> +	list_add_tail(&entries[1], &list1);
> +	list_add_tail(&entries[2], &list2);
> +	list_add_tail(&entries[3], &list2);
> +	list_add_tail(&entries[4], &list1);
> +
> +	/* before: [list1]->e[0]->e[1]->e[4], [list2]->e[2]->e[3] */
> +	list_splice_tail_init(&list2, &entries[4]);
> +	/* after: [list1]->e[0]->e[1]->e[2]->e[3]->e[4], [list2] empty */
> +
> +	list_for_each(cur, &list1) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 5);
> +
> +	KUNIT_EXPECT_TRUE(test, list_empty_careful(&list2));
> +}
> +
> +static void list_test_list_entry(struct kunit *test)
> +{
> +	struct list_test_struct test_struct;
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &test_struct, list_entry(&(test_struct.list), struct list_test_struct, list));
> +}
> +
> +static void list_test_list_first_entry(struct kunit *test)
> +{
> +	struct list_test_struct test_struct1, test_struct2;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&test_struct1.list, &list);
> +	list_add_tail(&test_struct2.list, &list);
> +
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &test_struct1, list_first_entry(&list, struct list_test_struct, list));
> +}
> +
> +static void list_test_list_last_entry(struct kunit *test)
> +{
> +	struct list_test_struct test_struct1, test_struct2;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&test_struct1.list, &list);
> +	list_add_tail(&test_struct2.list, &list);
> +
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &test_struct2, list_last_entry(&list, struct list_test_struct, list));
> +}
> +
> +static void list_test_list_first_entry_or_null(struct kunit *test)
> +{
> +	struct list_test_struct test_struct1, test_struct2;
> +	LIST_HEAD(list);
> +
> +	KUNIT_EXPECT_FALSE(test, list_first_entry_or_null(&list, struct list_test_struct, list));
> +
> +	list_add_tail(&test_struct1.list, &list);
> +	list_add_tail(&test_struct2.list, &list);
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &test_struct1, list_first_entry_or_null(&list, struct list_test_struct, list));
> +}
> +
> +static void list_test_list_next_entry(struct kunit *test)
> +{
> +	struct list_test_struct test_struct1, test_struct2;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&test_struct1.list, &list);
> +	list_add_tail(&test_struct2.list, &list);
> +
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &test_struct2, list_next_entry(&test_struct1, list));
> +}
> +
> +static void list_test_list_prev_entry(struct kunit *test)
> +{
> +	struct list_test_struct test_struct1, test_struct2;
> +	LIST_HEAD(list);
> +
> +	list_add_tail(&test_struct1.list, &list);
> +	list_add_tail(&test_struct2.list, &list);
> +
> +
> +	KUNIT_EXPECT_PTR_EQ(test, &test_struct1, list_prev_entry(&test_struct2, list));
> +}
> +
> +static void list_test_list_for_each(struct kunit *test)
> +{
> +	struct list_head entries[3], *cur;
> +	LIST_HEAD(list);
> +	int i = 0;
> +
> +	list_add_tail(&entries[0], &list);
> +	list_add_tail(&entries[1], &list);
> +	list_add_tail(&entries[2], &list);
> +
> +	list_for_each(cur, &list) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 3);
> +}
> +
> +static void list_test_list_for_each_prev(struct kunit *test)
> +{
> +	struct list_head entries[3], *cur;
> +	LIST_HEAD(list);
> +	int i = 2;
> +
> +	list_add_tail(&entries[0], &list);
> +	list_add_tail(&entries[1], &list);
> +	list_add_tail(&entries[2], &list);
> +
> +	list_for_each_prev(cur, &list) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		i--;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, -1);
> +}
> +
> +static void list_test_list_for_each_safe(struct kunit *test)
> +{
> +	struct list_head entries[3], *cur, *n;
> +	LIST_HEAD(list);
> +	int i = 0;
> +
> +
> +	list_add_tail(&entries[0], &list);
> +	list_add_tail(&entries[1], &list);
> +	list_add_tail(&entries[2], &list);
> +
> +	list_for_each_safe(cur, n, &list) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		list_del(&entries[i]);
> +		i++;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, 3);
> +	KUNIT_EXPECT_TRUE(test, list_empty(&list));
> +}
> +
> +static void list_test_list_for_each_prev_safe(struct kunit *test)
> +{
> +	struct list_head entries[3], *cur, *n;
> +	LIST_HEAD(list);
> +	int i = 2;
> +
> +	list_add_tail(&entries[0], &list);
> +	list_add_tail(&entries[1], &list);
> +	list_add_tail(&entries[2], &list);
> +
> +	list_for_each_prev_safe(cur, n, &list) {
> +		KUNIT_EXPECT_PTR_EQ(test, cur, &entries[i]);
> +		list_del(&entries[i]);
> +		i--;
> +	}
> +
> +	KUNIT_EXPECT_EQ(test, i, -1);
> +	KUNIT_EXPECT_TRUE(test, list_empty(&list));
> +}
> +
> +static void list_test_list_for_each_entry(struct kunit *test)
> +{
> +	struct list_test_struct entries[5], *cur;
> +	static LIST_HEAD(list);
> +	int i = 0;
> +
> +	for (i = 0; i < 5; ++i) {
> +		entries[i].data = i;
> +		list_add_tail(&entries[i].list, &list);
> +	}
> +
> +	i = 0;
> +
> +	list_for_each_entry(cur, &list, list) {
> +		KUNIT_EXPECT_EQ(test, cur->data, i);
> +		i++;
> +	}
> +	
> +	KUNIT_EXPECT_EQ(test, i, 5);
> +}
> +
> +static void list_test_list_for_each_entry_reverse(struct kunit *test)
> +{
> +	struct list_test_struct entries[5], *cur;
> +	static LIST_HEAD(list);
> +	int i = 0;
> +
> +	for (i = 0; i < 5; ++i) {
> +		entries[i].data = i;
> +		list_add_tail(&entries[i].list, &list);
> +	}
> +
> +	i = 4;
> +
> +	list_for_each_entry_reverse(cur, &list, list) {
> +		KUNIT_EXPECT_EQ(test, cur->data, i);
> +		i--;
> +	}
> +	
> +	KUNIT_EXPECT_EQ(test, i, -1);
> +}
> +
> +static struct kunit_case list_test_cases[] = {
> +	KUNIT_CASE(list_test_list_init),
> +	KUNIT_CASE(list_test_list_add),
> +	KUNIT_CASE(list_test_list_add_tail),
> +	KUNIT_CASE(list_test_list_del),
> +	KUNIT_CASE(list_test_list_replace),
> +	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_move),
> +	KUNIT_CASE(list_test_list_move_tail),
> +	KUNIT_CASE(list_test_list_bulk_move_tail),
> +	KUNIT_CASE(list_test_list_is_first),
> +	KUNIT_CASE(list_test_list_is_last),
> +	KUNIT_CASE(list_test_list_empty),
> +	KUNIT_CASE(list_test_list_empty_careful),
> +	KUNIT_CASE(list_test_list_rotate_left),
> +	KUNIT_CASE(list_test_list_rotate_to_front),
> +	KUNIT_CASE(list_test_list_is_singular),
> +	KUNIT_CASE(list_test_list_cut_position),
> +	KUNIT_CASE(list_test_list_cut_before),
> +	KUNIT_CASE(list_test_list_splice),
> +	KUNIT_CASE(list_test_list_splice_tail),
> +	KUNIT_CASE(list_test_list_splice_init),
> +	KUNIT_CASE(list_test_list_splice_tail_init),
> +	KUNIT_CASE(list_test_list_entry),
> +	KUNIT_CASE(list_test_list_first_entry),
> +	KUNIT_CASE(list_test_list_last_entry),
> +	KUNIT_CASE(list_test_list_first_entry_or_null),
> +	KUNIT_CASE(list_test_list_next_entry),
> +	KUNIT_CASE(list_test_list_prev_entry),
> +	KUNIT_CASE(list_test_list_for_each),
> +	KUNIT_CASE(list_test_list_for_each_prev),
> +	KUNIT_CASE(list_test_list_for_each_safe),
> +	KUNIT_CASE(list_test_list_for_each_prev_safe),
> +	KUNIT_CASE(list_test_list_for_each_entry),
> +	KUNIT_CASE(list_test_list_for_each_entry_reverse),
> +	{},
> +};
> +
> +static struct kunit_suite list_test_module = {
> +	.name = "list-test",

Please use kunit in the name here.

> +	.test_cases = list_test_cases,
> +};
> +
> +kunit_test_suite(list_test_module);
> 

thanks,
-- Shuah