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list: test: Test the klist structure
Add KUnit tests to the klist linked-list structure. These perform testing for different variations of node add and node delete in the klist data structure (<linux/klist.h>). Limitation: Since we use a static global variable, and if multiple instances of this test are run concurrently, the test may fail. Signed-off-by: Sadiya Kazi <sadiyakazi@google.com> Reviewed-by: Brendan Higgins <brendanhiggins@google.com> Reviewed-by: David Gow <davidgow@google.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Sadiya Kazi
Shuah Khan
parent
7232282dd4
commit
57b4f760f9
300
lib/list-test.c
300
lib/list-test.c
@ -8,6 +8,7 @@
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#include <kunit/test.h>
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#include <linux/list.h>
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#include <linux/klist.h>
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struct list_test_struct {
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int data;
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@ -1199,6 +1200,303 @@ static struct kunit_suite hlist_test_module = {
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.test_cases = hlist_test_cases,
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};
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kunit_test_suites(&list_test_module, &hlist_test_module);
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struct klist_test_struct {
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int data;
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struct klist klist;
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struct klist_node klist_node;
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};
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static int node_count;
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static struct klist_node *last_node;
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static void check_node(struct klist_node *node_ptr)
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{
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node_count++;
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last_node = node_ptr;
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}
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static void check_delete_node(struct klist_node *node_ptr)
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{
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node_count--;
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last_node = node_ptr;
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}
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static void klist_test_add_tail(struct kunit *test)
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{
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struct klist_node a, b;
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struct klist mylist;
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struct klist_iter i;
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node_count = 0;
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klist_init(&mylist, &check_node, NULL);
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klist_add_tail(&a, &mylist);
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KUNIT_EXPECT_EQ(test, node_count, 1);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &a);
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klist_add_tail(&b, &mylist);
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KUNIT_EXPECT_EQ(test, node_count, 2);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &b);
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/* should be [list] -> a -> b */
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klist_iter_init(&mylist, &i);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &a);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &b);
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KUNIT_EXPECT_NULL(test, klist_next(&i));
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klist_iter_exit(&i);
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}
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static void klist_test_add_head(struct kunit *test)
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{
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struct klist_node a, b;
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struct klist mylist;
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struct klist_iter i;
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node_count = 0;
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klist_init(&mylist, &check_node, NULL);
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klist_add_head(&a, &mylist);
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KUNIT_EXPECT_EQ(test, node_count, 1);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &a);
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klist_add_head(&b, &mylist);
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KUNIT_EXPECT_EQ(test, node_count, 2);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &b);
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/* should be [list] -> b -> a */
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klist_iter_init(&mylist, &i);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &b);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &a);
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KUNIT_EXPECT_NULL(test, klist_next(&i));
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klist_iter_exit(&i);
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}
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static void klist_test_add_behind(struct kunit *test)
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{
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struct klist_node a, b, c, d;
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struct klist mylist;
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struct klist_iter i;
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node_count = 0;
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klist_init(&mylist, &check_node, NULL);
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klist_add_head(&a, &mylist);
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klist_add_head(&b, &mylist);
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klist_add_behind(&c, &a);
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KUNIT_EXPECT_EQ(test, node_count, 3);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &c);
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klist_add_behind(&d, &b);
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KUNIT_EXPECT_EQ(test, node_count, 4);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &d);
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klist_iter_init(&mylist, &i);
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/* should be [list] -> b -> d -> a -> c*/
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &b);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &d);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &a);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &c);
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KUNIT_EXPECT_NULL(test, klist_next(&i));
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klist_iter_exit(&i);
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}
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static void klist_test_add_before(struct kunit *test)
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{
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struct klist_node a, b, c, d;
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struct klist mylist;
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struct klist_iter i;
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node_count = 0;
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klist_init(&mylist, &check_node, NULL);
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klist_add_head(&a, &mylist);
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klist_add_head(&b, &mylist);
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klist_add_before(&c, &a);
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KUNIT_EXPECT_EQ(test, node_count, 3);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &c);
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klist_add_before(&d, &b);
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KUNIT_EXPECT_EQ(test, node_count, 4);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &d);
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klist_iter_init(&mylist, &i);
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/* should be [list] -> b -> d -> a -> c*/
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &d);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &b);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &c);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &a);
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KUNIT_EXPECT_NULL(test, klist_next(&i));
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klist_iter_exit(&i);
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}
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/*
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* Verify that klist_del() delays the deletion of a node until there
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* are no other references to it
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*/
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static void klist_test_del_refcount_greater_than_zero(struct kunit *test)
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{
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struct klist_node a, b, c, d;
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struct klist mylist;
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struct klist_iter i;
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node_count = 0;
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klist_init(&mylist, &check_node, &check_delete_node);
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/* Add nodes a,b,c,d to the list*/
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klist_add_tail(&a, &mylist);
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klist_add_tail(&b, &mylist);
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klist_add_tail(&c, &mylist);
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klist_add_tail(&d, &mylist);
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klist_iter_init(&mylist, &i);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &a);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &b);
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/* Advance the iterator to point to node c*/
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &c);
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/* Try to delete node c while there is a reference to it*/
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klist_del(&c);
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/*
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* Verify that node c is still attached to the list even after being
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* deleted. Since the iterator still points to c, the reference count is not
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* decreased to 0
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*/
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KUNIT_EXPECT_TRUE(test, klist_node_attached(&c));
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/* Check that node c has not been removed yet*/
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KUNIT_EXPECT_EQ(test, node_count, 4);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &d);
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klist_iter_exit(&i);
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/*
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* Since the iterator is no longer pointing to node c, node c is removed
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* from the list
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*/
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KUNIT_EXPECT_EQ(test, node_count, 3);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &c);
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}
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/*
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* Verify that klist_del() deletes a node immediately when there are no
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* other references to it.
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*/
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static void klist_test_del_refcount_zero(struct kunit *test)
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{
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struct klist_node a, b, c, d;
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struct klist mylist;
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struct klist_iter i;
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node_count = 0;
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klist_init(&mylist, &check_node, &check_delete_node);
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/* Add nodes a,b,c,d to the list*/
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klist_add_tail(&a, &mylist);
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klist_add_tail(&b, &mylist);
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klist_add_tail(&c, &mylist);
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klist_add_tail(&d, &mylist);
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/* Delete node c*/
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klist_del(&c);
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/* Check that node c is deleted from the list*/
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KUNIT_EXPECT_EQ(test, node_count, 3);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &c);
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/* Should be [list] -> a -> b -> d*/
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klist_iter_init(&mylist, &i);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &a);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &b);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &d);
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KUNIT_EXPECT_NULL(test, klist_next(&i));
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klist_iter_exit(&i);
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}
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static void klist_test_remove(struct kunit *test)
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{
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/* This test doesn't check correctness under concurrent access */
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struct klist_node a, b, c, d;
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struct klist mylist;
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struct klist_iter i;
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node_count = 0;
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klist_init(&mylist, &check_node, &check_delete_node);
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/* Add nodes a,b,c,d to the list*/
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klist_add_tail(&a, &mylist);
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klist_add_tail(&b, &mylist);
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klist_add_tail(&c, &mylist);
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klist_add_tail(&d, &mylist);
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/* Delete node c*/
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klist_remove(&c);
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/* Check the nodes in the list*/
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KUNIT_EXPECT_EQ(test, node_count, 3);
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KUNIT_EXPECT_PTR_EQ(test, last_node, &c);
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/* should be [list] -> a -> b -> d*/
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klist_iter_init(&mylist, &i);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &a);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &b);
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KUNIT_EXPECT_PTR_EQ(test, klist_next(&i), &d);
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KUNIT_EXPECT_NULL(test, klist_next(&i));
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klist_iter_exit(&i);
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}
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static void klist_test_node_attached(struct kunit *test)
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{
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struct klist_node a = {};
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struct klist mylist;
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klist_init(&mylist, NULL, NULL);
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KUNIT_EXPECT_FALSE(test, klist_node_attached(&a));
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klist_add_head(&a, &mylist);
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KUNIT_EXPECT_TRUE(test, klist_node_attached(&a));
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klist_del(&a);
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KUNIT_EXPECT_FALSE(test, klist_node_attached(&a));
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}
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static struct kunit_case klist_test_cases[] = {
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KUNIT_CASE(klist_test_add_tail),
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KUNIT_CASE(klist_test_add_head),
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KUNIT_CASE(klist_test_add_behind),
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KUNIT_CASE(klist_test_add_before),
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KUNIT_CASE(klist_test_del_refcount_greater_than_zero),
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KUNIT_CASE(klist_test_del_refcount_zero),
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KUNIT_CASE(klist_test_remove),
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KUNIT_CASE(klist_test_node_attached),
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{},
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};
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static struct kunit_suite klist_test_module = {
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.name = "klist",
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.test_cases = klist_test_cases,
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};
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kunit_test_suites(&list_test_module, &hlist_test_module, &klist_test_module);
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MODULE_LICENSE("GPL v2");
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