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kunit: string-stream: Add tests for freeing resource-managed string_stream

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string_stream_managed_free_test() allocates a resource-managed
string_stream and tests that kunit_free_string_stream() calls
string_stream_destroy().

string_stream_resource_free_test() allocates a resource-managed
string_stream and tests that string_stream_destroy() is called
when the test resources are cleaned up.

The old string_stream_init_test() has been split into two tests,
one for kunit_alloc_string_stream() and the other for
alloc_string_stream().

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: David Gow <davidgow@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Richard Fitzgerald 2023-08-28 11:41:09 +01:00 committed by Shuah Khan
parent a3fdf78478
commit d1a0d699bf
2 changed files with 145 additions and 5 deletions
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147
lib/kunit/string-stream-test.c
View File

@ -6,17 +6,33 @@
* Author: Brendan Higgins <brendanhiggins@google.com>
*/
#include <kunit/static_stub.h>
#include <kunit/test.h>
#include <linux/slab.h>
#include "string-stream.h"
/* This avoids a cast warning if kfree() is passed direct to kunit_add_action(). */
struct string_stream_test_priv {
/* For testing resource-managed free. */
struct string_stream *expected_free_stream;
bool stream_was_freed;
bool stream_free_again;
};
/* Avoids a cast warning if kfree() is passed direct to kunit_add_action(). */
static void kfree_wrapper(void *p)
{
kfree(p);
}
/* Avoids a cast warning if string_stream_destroy() is passed direct to kunit_add_action(). */
static void cleanup_raw_stream(void *p)
{
struct string_stream *stream = p;
string_stream_destroy(stream);
}
static char *get_concatenated_string(struct kunit *test, struct string_stream *stream)
{
char *str = string_stream_get_string(stream);
@ -27,11 +43,12 @@ static char *get_concatenated_string(struct kunit *test, struct string_stream *s
return str;
}
/* string_stream object is initialized correctly. */
static void string_stream_init_test(struct kunit *test)
/* Managed string_stream object is initialized correctly. */
static void string_stream_managed_init_test(struct kunit *test)
{
struct string_stream *stream;
/* Resource-managed initialization. */
stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
@ -42,6 +59,109 @@ static void string_stream_init_test(struct kunit *test)
KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
}
/* Unmanaged string_stream object is initialized correctly. */
static void string_stream_unmanaged_init_test(struct kunit *test)
{
struct string_stream *stream;
stream = alloc_string_stream(GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, stream);
kunit_add_action(test, cleanup_raw_stream, stream);
KUNIT_EXPECT_EQ(test, stream->length, 0);
KUNIT_EXPECT_TRUE(test, list_empty(&stream->fragments));
KUNIT_EXPECT_EQ(test, stream->gfp, GFP_KERNEL);
KUNIT_EXPECT_FALSE(test, stream->append_newlines);
KUNIT_EXPECT_TRUE(test, string_stream_is_empty(stream));
}
static void string_stream_destroy_stub(struct string_stream *stream)
{
struct kunit *fake_test = kunit_get_current_test();
struct string_stream_test_priv *priv = fake_test->priv;
/* The kunit could own string_streams other than the one we are testing. */
if (stream == priv->expected_free_stream) {
if (priv->stream_was_freed)
priv->stream_free_again = true;
else
priv->stream_was_freed = true;
}
/*
* Calling string_stream_destroy() will only call this function again
* because the redirection stub is still active.
* Avoid calling deactivate_static_stub() or changing current->kunit_test
* during cleanup.
*/
string_stream_clear(stream);
kfree(stream);
}
/* kunit_free_string_stream() calls string_stream_desrtoy() */
static void string_stream_managed_free_test(struct kunit *test)
{
struct string_stream_test_priv *priv = test->priv;
priv->expected_free_stream = NULL;
priv->stream_was_freed = false;
priv->stream_free_again = false;
kunit_activate_static_stub(test,
string_stream_destroy,
string_stream_destroy_stub);
priv->expected_free_stream = kunit_alloc_string_stream(test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);
/* This should call the stub function. */
kunit_free_string_stream(test, priv->expected_free_stream);
KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
}
/* string_stream object is freed when test is cleaned up. */
static void string_stream_resource_free_test(struct kunit *test)
{
struct string_stream_test_priv *priv = test->priv;
struct kunit *fake_test;
fake_test = kunit_kzalloc(test, sizeof(*fake_test), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fake_test);
kunit_init_test(fake_test, "string_stream_fake_test", NULL);
fake_test->priv = priv;
/*
* Activate stub before creating string_stream so the
* string_stream will be cleaned up first.
*/
priv->expected_free_stream = NULL;
priv->stream_was_freed = false;
priv->stream_free_again = false;
kunit_activate_static_stub(fake_test,
string_stream_destroy,
string_stream_destroy_stub);
priv->expected_free_stream = kunit_alloc_string_stream(fake_test, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, priv->expected_free_stream);
/* Set current->kunit_test to fake_test so the static stub will be called. */
current->kunit_test = fake_test;
/* Cleanup test - the stub function should be called */
kunit_cleanup(fake_test);
/* Set current->kunit_test back to current test. */
current->kunit_test = test;
KUNIT_EXPECT_TRUE(test, priv->stream_was_freed);
KUNIT_EXPECT_FALSE(test, priv->stream_free_again);
}
/*
* Add a series of lines to a string_stream. Check that all lines
* appear in the correct order and no characters are dropped.
@ -334,8 +454,24 @@ static void string_stream_auto_newline_test(struct kunit *test)
"One\nTwo\nThree\nFour\nFive\nSix\nSeven\n\nEight\n");
}
static int string_stream_test_init(struct kunit *test)
{
struct string_stream_test_priv *priv;
priv = kunit_kzalloc(test, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
test->priv = priv;
return 0;
}
static struct kunit_case string_stream_test_cases[] = {
KUNIT_CASE(string_stream_init_test),
KUNIT_CASE(string_stream_managed_init_test),
KUNIT_CASE(string_stream_unmanaged_init_test),
KUNIT_CASE(string_stream_managed_free_test),
KUNIT_CASE(string_stream_resource_free_test),
KUNIT_CASE(string_stream_line_add_test),
KUNIT_CASE(string_stream_variable_length_line_test),
KUNIT_CASE(string_stream_append_test),
@ -348,6 +484,7 @@ static struct kunit_case string_stream_test_cases[] = {
static struct kunit_suite string_stream_test_suite = {
.name = "string-stream-test",
.test_cases = string_stream_test_cases
.test_cases = string_stream_test_cases,
.init = string_stream_test_init,
};
kunit_test_suites(&string_stream_test_suite);

3
lib/kunit/string-stream.c
View File

@ -6,6 +6,7 @@
* Author: Brendan Higgins <brendanhiggins@google.com>
*/
#include <kunit/static_stub.h>
#include <kunit/test.h>
#include <linux/list.h>
#include <linux/slab.h>
@ -170,6 +171,8 @@ struct string_stream *alloc_string_stream(gfp_t gfp)
void string_stream_destroy(struct string_stream *stream)
{
KUNIT_STATIC_STUB_REDIRECT(string_stream_destroy, stream);
if (!stream)
return;