From 7b3391057fa1921ba84ef17852a6998c0af27e4d Mon Sep 17 00:00:00 2001 From: Daniel Latypov Date: Thu, 13 Jan 2022 08:59:26 -0800 Subject: kunit: add example test case showing off all the expect macros Currently, these macros are only really documented near the bottom of https://www.kernel.org/doc/html/latest/dev-tools/kunit/api/test.html#c.KUNIT_FAIL. E.g. it's likely someone might just not realize that KUNIT_EXPECT_STREQ() exists and instead use KUNIT_EXPECT_FALSE(strcmp()) or similar. This can also serve as a basic smoketest that the KUnit assert machinery still works for all the macros. Signed-off-by: Daniel Latypov Reviewed-by: Brendan Higgins Reviewed-by: David Gow Signed-off-by: Shuah Khan --- lib/kunit/kunit-example-test.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) (limited to 'lib') diff --git a/lib/kunit/kunit-example-test.c b/lib/kunit/kunit-example-test.c index 51099b0ca29c..4bbf37c04eba 100644 --- a/lib/kunit/kunit-example-test.c +++ b/lib/kunit/kunit-example-test.c @@ -69,6 +69,47 @@ static void example_mark_skipped_test(struct kunit *test) /* This line should run */ kunit_info(test, "You should see this line."); } + +/* + * This test shows off all the types of KUNIT_EXPECT macros. + */ +static void example_all_expect_macros_test(struct kunit *test) +{ + /* Boolean assertions */ + KUNIT_EXPECT_TRUE(test, true); + KUNIT_EXPECT_FALSE(test, false); + + /* Integer assertions */ + KUNIT_EXPECT_EQ(test, 1, 1); /* check == */ + KUNIT_EXPECT_GE(test, 1, 1); /* check >= */ + KUNIT_EXPECT_LE(test, 1, 1); /* check <= */ + KUNIT_EXPECT_NE(test, 1, 0); /* check != */ + KUNIT_EXPECT_GT(test, 1, 0); /* check > */ + KUNIT_EXPECT_LT(test, 0, 1); /* check < */ + + /* Pointer assertions */ + KUNIT_EXPECT_NOT_ERR_OR_NULL(test, test); + KUNIT_EXPECT_PTR_EQ(test, NULL, NULL); + KUNIT_EXPECT_PTR_NE(test, test, NULL); + + /* String assertions */ + KUNIT_EXPECT_STREQ(test, "hi", "hi"); + KUNIT_EXPECT_STRNEQ(test, "hi", "bye"); + + /* + * There are also ASSERT variants of all of the above that abort test + * execution if they fail. Useful for memory allocations, etc. + */ + KUNIT_ASSERT_GT(test, sizeof(char), 0); + + /* + * There are also _MSG variants of all of the above that let you include + * additional text on failure. + */ + KUNIT_EXPECT_GT_MSG(test, sizeof(int), 0, "Your ints are 0-bit?!"); + KUNIT_ASSERT_GT_MSG(test, sizeof(int), 0, "Your ints are 0-bit?!"); +} + /* * Here we make a list of all the test cases we want to add to the test suite * below. @@ -83,6 +124,7 @@ static struct kunit_case example_test_cases[] = { KUNIT_CASE(example_simple_test), KUNIT_CASE(example_skip_test), KUNIT_CASE(example_mark_skipped_test), + KUNIT_CASE(example_all_expect_macros_test), {} }; -- cgit v1.2.3-70-g09d2 From 4fdacef8ac5a5382eeb1bc6fc2632d71a09d52cd Mon Sep 17 00:00:00 2001 From: Daniel Latypov Date: Thu, 13 Jan 2022 08:59:27 -0800 Subject: kunit: move check if assertion passed into the macros Currently the code always calls kunit_do_assertion() even though it does nothing when `pass` is true. This change moves the `if(!(pass))` check into the macro instead and renames the function to kunit_do_failed_assertion(). I feel this a bit easier to read and understand. This has the potential upside of avoiding a function call that does nothing most of the time (assuming your tests are passing) but comes with the downside of generating a bit more code and branches. We try to mitigate the branches by tagging them with `unlikely()`. This also means we don't have to initialize structs that we don't need, which will become a tiny bit more expensive if we switch over to using static variables to try and reduce stack usage. (There's runtime code to check if the variable has been initialized yet or not). Signed-off-by: Daniel Latypov Reviewed-by: Brendan Higgins Reviewed-by: David Gow Signed-off-by: Shuah Khan --- include/kunit/test.h | 21 +++++++++++---------- lib/kunit/test.c | 13 ++++--------- 2 files changed, 15 insertions(+), 19 deletions(-) (limited to 'lib') diff --git a/include/kunit/test.h b/include/kunit/test.h index b26400731c02..12cabd15449a 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -12,6 +12,7 @@ #include #include +#include #include #include #include @@ -770,18 +771,18 @@ void __printf(2, 3) kunit_log_append(char *log, const char *fmt, ...); */ #define KUNIT_SUCCEED(test) do {} while (0) -void kunit_do_assertion(struct kunit *test, - struct kunit_assert *assert, - bool pass, - const char *fmt, ...); +void kunit_do_failed_assertion(struct kunit *test, + struct kunit_assert *assert, + const char *fmt, ...); #define KUNIT_ASSERTION(test, pass, assert_class, INITIALIZER, fmt, ...) do { \ - struct assert_class __assertion = INITIALIZER; \ - kunit_do_assertion(test, \ - &__assertion.assert, \ - pass, \ - fmt, \ - ##__VA_ARGS__); \ + if (unlikely(!(pass))) { \ + struct assert_class __assertion = INITIALIZER; \ + kunit_do_failed_assertion(test, \ + &__assertion.assert, \ + fmt, \ + ##__VA_ARGS__); \ + } \ } while (0) diff --git a/lib/kunit/test.c b/lib/kunit/test.c index c7ed4aabec04..3a52c321c280 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -275,16 +275,11 @@ static void __noreturn kunit_abort(struct kunit *test) WARN_ONCE(true, "Throw could not abort from test!\n"); } -void kunit_do_assertion(struct kunit *test, - struct kunit_assert *assert, - bool pass, - const char *fmt, ...) +void kunit_do_failed_assertion(struct kunit *test, + struct kunit_assert *assert, + const char *fmt, ...) { va_list args; - - if (pass) - return; - va_start(args, fmt); assert->message.fmt = fmt; @@ -297,7 +292,7 @@ void kunit_do_assertion(struct kunit *test, if (assert->type == KUNIT_ASSERTION) kunit_abort(test); } -EXPORT_SYMBOL_GPL(kunit_do_assertion); +EXPORT_SYMBOL_GPL(kunit_do_failed_assertion); void kunit_init_test(struct kunit *test, const char *name, char *log) { -- cgit v1.2.3-70-g09d2 From dd640d70874bd27fb081d444252677766321c32f Mon Sep 17 00:00:00 2001 From: Daniel Latypov Date: Thu, 13 Jan 2022 08:59:29 -0800 Subject: kunit: factor out kunit_base_assert_format() call into kunit_fail() We call this function first thing for all the assertion `format()` functions. This is the part that prints the file and line number and assertion type (EXPECTATION, ASSERTION). Having it as part of the format functions lets us have the flexibility to not print that information (or print it differently) for new assertion types, but I think this we don't need that. And in the future, we'd like to consider factoring that data (file, line#, type) out of the kunit_assert struct and into a `static` variable, as Linus suggested [1], so we'd need to extract it anyways. [1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ Signed-off-by: Daniel Latypov Reviewed-by: David Gow Reviewed-by: Brendan Higgins Signed-off-by: Shuah Khan --- lib/kunit/assert.c | 6 ------ lib/kunit/test.c | 1 + 2 files changed, 1 insertion(+), 6 deletions(-) (limited to 'lib') diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c index b972bda61c0c..4d9a1295efc7 100644 --- a/lib/kunit/assert.c +++ b/lib/kunit/assert.c @@ -40,7 +40,6 @@ EXPORT_SYMBOL_GPL(kunit_assert_print_msg); void kunit_fail_assert_format(const struct kunit_assert *assert, struct string_stream *stream) { - kunit_base_assert_format(assert, stream); string_stream_add(stream, "%pV", &assert->message); } EXPORT_SYMBOL_GPL(kunit_fail_assert_format); @@ -52,7 +51,6 @@ void kunit_unary_assert_format(const struct kunit_assert *assert, unary_assert = container_of(assert, struct kunit_unary_assert, assert); - kunit_base_assert_format(assert, stream); if (unary_assert->expected_true) string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s to be true, but is false\n", @@ -73,7 +71,6 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, ptr_assert = container_of(assert, struct kunit_ptr_not_err_assert, assert); - kunit_base_assert_format(assert, stream); if (!ptr_assert->value) { string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s is not null, but is\n", @@ -119,7 +116,6 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, binary_assert = container_of(assert, struct kunit_binary_assert, assert); - kunit_base_assert_format(assert, stream); string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n", binary_assert->left_text, @@ -147,7 +143,6 @@ void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, binary_assert = container_of(assert, struct kunit_binary_ptr_assert, assert); - kunit_base_assert_format(assert, stream); string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n", binary_assert->left_text, @@ -187,7 +182,6 @@ void kunit_binary_str_assert_format(const struct kunit_assert *assert, binary_assert = container_of(assert, struct kunit_binary_str_assert, assert); - kunit_base_assert_format(assert, stream); string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n", binary_assert->left_text, diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 3a52c321c280..345a9dd88c27 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -255,6 +255,7 @@ static void kunit_fail(struct kunit *test, struct kunit_assert *assert) return; } + kunit_base_assert_format(assert, stream); assert->format(assert, stream); kunit_print_string_stream(test, stream); -- cgit v1.2.3-70-g09d2 From 21957f90b28f6bc118c055e3e564d45f6e4df45d Mon Sep 17 00:00:00 2001 From: Daniel Latypov Date: Thu, 13 Jan 2022 08:59:30 -0800 Subject: kunit: split out part of kunit_assert into a static const This is per Linus's suggestion in [1]. The issue there is that every KUNIT_EXPECT/KUNIT_ASSERT puts a kunit_assert object onto the stack. Normally we rely on compilers to elide this, but when that doesn't work out, this blows up the stack usage of kunit test functions. We can move some data off the stack by making it static. This change introduces a new `struct kunit_loc` to hold the file and line number and then just passing assert_type (EXPECT or ASSERT) as an argument. In [1], it was suggested to also move out the format string as well, but users could theoretically craft a format string at runtime, so we can't. This change leaves a copy of `assert_type` in kunit_assert for now because cleaning up all the macros to not pass it around is a bit more involved. Here's an example of the expanded code for KUNIT_FAIL(): if (__builtin_expect(!!(!(false)), 0)) { static const struct kunit_loc loc = { .file = ... }; struct kunit_fail_assert __assertion = { .assert = { .type ... }; kunit_do_failed_assertion(test, &loc, KUNIT_EXPECTATION, &__assertion.assert, ...); }; [1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ Signed-off-by: Daniel Latypov Suggested-by: Linus Torvalds Reviewed-by: David Gow Reviewed-by: Brendan Higgins Signed-off-by: Shuah Khan --- include/kunit/assert.h | 25 +++++++++++++++++-------- include/kunit/test.h | 12 +++++++++++- lib/kunit/assert.c | 9 +++++---- lib/kunit/test.c | 15 +++++++++------ 4 files changed, 42 insertions(+), 19 deletions(-) (limited to 'lib') diff --git a/include/kunit/assert.h b/include/kunit/assert.h index f568166ef034..0da1bbdd1ee8 100644 --- a/include/kunit/assert.h +++ b/include/kunit/assert.h @@ -28,11 +28,21 @@ enum kunit_assert_type { KUNIT_EXPECTATION, }; +/** + * struct kunit_loc - Identifies the source location of a line of code. + * @line: the line number in the file. + * @file: the file name. + */ +struct kunit_loc { + int line; + const char *file; +}; + +#define KUNIT_CURRENT_LOC { .file = __FILE__, .line = __LINE__ } + /** * struct kunit_assert - Data for printing a failed assertion or expectation. * @type: the type (either an expectation or an assertion) of this kunit_assert. - * @line: the source code line number that the expectation/assertion is at. - * @file: the file path of the source file that the expectation/assertion is in. * @message: an optional message to provide additional context. * @format: a function which formats the data in this kunit_assert to a string. * @@ -40,9 +50,9 @@ enum kunit_assert_type { * format a string to a user reporting the failure. */ struct kunit_assert { + // TODO(dlatypov@google.com): delete this unused field when we've + // updated all the related KUNIT_INIT_ASSERT* macros. enum kunit_assert_type type; - int line; - const char *file; struct va_format message; void (*format)(const struct kunit_assert *assert, struct string_stream *stream); @@ -65,14 +75,13 @@ struct kunit_assert { */ #define KUNIT_INIT_ASSERT_STRUCT(assert_type, fmt) { \ .type = assert_type, \ - .file = __FILE__, \ - .line = __LINE__, \ .message = KUNIT_INIT_VA_FMT_NULL, \ .format = fmt \ } -void kunit_base_assert_format(const struct kunit_assert *assert, - struct string_stream *stream); +void kunit_assert_prologue(const struct kunit_loc *loc, + enum kunit_assert_type type, + struct string_stream *stream); void kunit_assert_print_msg(const struct kunit_assert *assert, struct string_stream *stream); diff --git a/include/kunit/test.h b/include/kunit/test.h index 25ea3bce6663..7b752175e614 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -772,13 +772,18 @@ void __printf(2, 3) kunit_log_append(char *log, const char *fmt, ...); #define KUNIT_SUCCEED(test) do {} while (0) void kunit_do_failed_assertion(struct kunit *test, + const struct kunit_loc *loc, + enum kunit_assert_type type, struct kunit_assert *assert, const char *fmt, ...); -#define KUNIT_ASSERTION(test, pass, assert_class, INITIALIZER, fmt, ...) do { \ +#define KUNIT_ASSERTION(test, assert_type, pass, assert_class, INITIALIZER, fmt, ...) do { \ if (unlikely(!(pass))) { \ + static const struct kunit_loc loc = KUNIT_CURRENT_LOC; \ struct assert_class __assertion = INITIALIZER; \ kunit_do_failed_assertion(test, \ + &loc, \ + assert_type, \ &__assertion.assert, \ fmt, \ ##__VA_ARGS__); \ @@ -788,6 +793,7 @@ void kunit_do_failed_assertion(struct kunit *test, #define KUNIT_FAIL_ASSERTION(test, assert_type, fmt, ...) \ KUNIT_ASSERTION(test, \ + assert_type, \ false, \ kunit_fail_assert, \ KUNIT_INIT_FAIL_ASSERT_STRUCT(assert_type), \ @@ -818,6 +824,7 @@ void kunit_do_failed_assertion(struct kunit *test, fmt, \ ...) \ KUNIT_ASSERTION(test, \ + assert_type, \ !!(condition) == !!expected_true, \ kunit_unary_assert, \ KUNIT_INIT_UNARY_ASSERT_STRUCT(assert_type, \ @@ -876,6 +883,7 @@ do { \ typeof(right) __right = (right); \ \ KUNIT_ASSERTION(test, \ + assert_type, \ __left op __right, \ assert_class, \ ASSERT_CLASS_INIT(assert_type, \ @@ -1230,6 +1238,7 @@ do { \ const char *__right = (right); \ \ KUNIT_ASSERTION(test, \ + assert_type, \ strcmp(__left, __right) op 0, \ kunit_binary_str_assert, \ KUNIT_INIT_BINARY_STR_ASSERT_STRUCT(assert_type, \ @@ -1289,6 +1298,7 @@ do { \ typeof(ptr) __ptr = (ptr); \ \ KUNIT_ASSERTION(test, \ + assert_type, \ !IS_ERR_OR_NULL(__ptr), \ kunit_ptr_not_err_assert, \ KUNIT_INIT_PTR_NOT_ERR_STRUCT(assert_type, \ diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c index 4d9a1295efc7..9f4492a8e24e 100644 --- a/lib/kunit/assert.c +++ b/lib/kunit/assert.c @@ -10,12 +10,13 @@ #include "string-stream.h" -void kunit_base_assert_format(const struct kunit_assert *assert, +void kunit_assert_prologue(const struct kunit_loc *loc, + enum kunit_assert_type type, struct string_stream *stream) { const char *expect_or_assert = NULL; - switch (assert->type) { + switch (type) { case KUNIT_EXPECTATION: expect_or_assert = "EXPECTATION"; break; @@ -25,9 +26,9 @@ void kunit_base_assert_format(const struct kunit_assert *assert, } string_stream_add(stream, "%s FAILED at %s:%d\n", - expect_or_assert, assert->file, assert->line); + expect_or_assert, loc->file, loc->line); } -EXPORT_SYMBOL_GPL(kunit_base_assert_format); +EXPORT_SYMBOL_GPL(kunit_assert_prologue); void kunit_assert_print_msg(const struct kunit_assert *assert, struct string_stream *stream) diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 345a9dd88c27..7dec3248562f 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -240,7 +240,8 @@ static void kunit_print_string_stream(struct kunit *test, } } -static void kunit_fail(struct kunit *test, struct kunit_assert *assert) +static void kunit_fail(struct kunit *test, const struct kunit_loc *loc, + enum kunit_assert_type type, struct kunit_assert *assert) { struct string_stream *stream; @@ -250,12 +251,12 @@ static void kunit_fail(struct kunit *test, struct kunit_assert *assert) if (!stream) { WARN(true, "Could not allocate stream to print failed assertion in %s:%d\n", - assert->file, - assert->line); + loc->file, + loc->line); return; } - kunit_base_assert_format(assert, stream); + kunit_assert_prologue(loc, type, stream); assert->format(assert, stream); kunit_print_string_stream(test, stream); @@ -277,6 +278,8 @@ static void __noreturn kunit_abort(struct kunit *test) } void kunit_do_failed_assertion(struct kunit *test, + const struct kunit_loc *loc, + enum kunit_assert_type type, struct kunit_assert *assert, const char *fmt, ...) { @@ -286,11 +289,11 @@ void kunit_do_failed_assertion(struct kunit *test, assert->message.fmt = fmt; assert->message.va = &args; - kunit_fail(test, assert); + kunit_fail(test, loc, type, assert); va_end(args); - if (assert->type == KUNIT_ASSERTION) + if (type == KUNIT_ASSERTION) kunit_abort(test); } EXPORT_SYMBOL_GPL(kunit_do_failed_assertion); -- cgit v1.2.3-70-g09d2 From 6419abb80e82c603bbec6d7f5af6c2f79fa5c4ae Mon Sep 17 00:00:00 2001 From: Daniel Latypov Date: Tue, 25 Jan 2022 13:00:09 -0800 Subject: kunit: remove va_format from kunit_assert The concern is that having a lot of redundant fields in kunit_assert can blow up stack usage if the compiler doesn't optimize them away [1]. The comment on this field implies that it was meant to be initialized when the expect/assert was declared, but this only happens when we run kunit_do_failed_assertion(). We don't need to access it outside of that function, so move it out of the struct and make it a local variable there. This change also takes the chance to reduce the number of macros by inlining the now simplified KUNIT_INIT_ASSERT_STRUCT() macro. [1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ Signed-off-by: Daniel Latypov Reviewed-by: David Gow Reviewed-by: Brendan Higgins Signed-off-by: Shuah Khan --- include/kunit/assert.h | 43 +++++++++++++------------------------------ lib/kunit/assert.c | 27 ++++++++++++++++----------- lib/kunit/test.c | 12 +++++++----- 3 files changed, 36 insertions(+), 46 deletions(-) (limited to 'lib') diff --git a/include/kunit/assert.h b/include/kunit/assert.h index f2b3ae5cc2de..0b3704db54b6 100644 --- a/include/kunit/assert.h +++ b/include/kunit/assert.h @@ -42,44 +42,21 @@ struct kunit_loc { /** * struct kunit_assert - Data for printing a failed assertion or expectation. - * @message: an optional message to provide additional context. * @format: a function which formats the data in this kunit_assert to a string. * * Represents a failed expectation/assertion. Contains all the data necessary to * format a string to a user reporting the failure. */ struct kunit_assert { - struct va_format message; void (*format)(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream); }; -/** - * KUNIT_INIT_VA_FMT_NULL - Default initializer for struct va_format. - * - * Used inside a struct initialization block to initialize struct va_format to - * default values where fmt and va are null. - */ -#define KUNIT_INIT_VA_FMT_NULL { .fmt = NULL, .va = NULL } - -/** - * KUNIT_INIT_ASSERT_STRUCT() - Initializer for a &struct kunit_assert. - * @fmt: The formatting function which builds a string out of this kunit_assert. - * - * The base initializer for a &struct kunit_assert. - */ -#define KUNIT_INIT_ASSERT_STRUCT(fmt) { \ - .message = KUNIT_INIT_VA_FMT_NULL, \ - .format = fmt \ -} - void kunit_assert_prologue(const struct kunit_loc *loc, enum kunit_assert_type type, struct string_stream *stream); -void kunit_assert_print_msg(const struct kunit_assert *assert, - struct string_stream *stream); - /** * struct kunit_fail_assert - Represents a plain fail expectation/assertion. * @assert: The parent of this type. @@ -91,6 +68,7 @@ struct kunit_fail_assert { }; void kunit_fail_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream); /** @@ -100,7 +78,7 @@ void kunit_fail_assert_format(const struct kunit_assert *assert, * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros. */ #define KUNIT_INIT_FAIL_ASSERT_STRUCT { \ - .assert = KUNIT_INIT_ASSERT_STRUCT(kunit_fail_assert_format) \ + .assert = { .format = kunit_fail_assert_format }, \ } /** @@ -120,6 +98,7 @@ struct kunit_unary_assert { }; void kunit_unary_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream); /** @@ -131,7 +110,7 @@ void kunit_unary_assert_format(const struct kunit_assert *assert, * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros. */ #define KUNIT_INIT_UNARY_ASSERT_STRUCT(cond, expect_true) { \ - .assert = KUNIT_INIT_ASSERT_STRUCT(kunit_unary_assert_format), \ + .assert = { .format = kunit_unary_assert_format }, \ .condition = cond, \ .expected_true = expect_true \ } @@ -153,6 +132,7 @@ struct kunit_ptr_not_err_assert { }; void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream); /** @@ -165,7 +145,7 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, * KUNIT_EXPECT_* and KUNIT_ASSERT_* macros. */ #define KUNIT_INIT_PTR_NOT_ERR_STRUCT(txt, val) { \ - .assert = KUNIT_INIT_ASSERT_STRUCT(kunit_ptr_not_err_assert_format), \ + .assert = { .format = kunit_ptr_not_err_assert_format }, \ .text = txt, \ .value = val \ } @@ -194,6 +174,7 @@ struct kunit_binary_assert { }; void kunit_binary_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream); /** @@ -213,7 +194,7 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, left_val, \ right_str, \ right_val) { \ - .assert = KUNIT_INIT_ASSERT_STRUCT(kunit_binary_assert_format), \ + .assert = { .format = kunit_binary_assert_format }, \ .operation = op_str, \ .left_text = left_str, \ .left_value = left_val, \ @@ -245,6 +226,7 @@ struct kunit_binary_ptr_assert { }; void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream); /** @@ -265,7 +247,7 @@ void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, left_val, \ right_str, \ right_val) { \ - .assert = KUNIT_INIT_ASSERT_STRUCT(kunit_binary_ptr_assert_format), \ + .assert = { .format = kunit_binary_ptr_assert_format }, \ .operation = op_str, \ .left_text = left_str, \ .left_value = left_val, \ @@ -297,6 +279,7 @@ struct kunit_binary_str_assert { }; void kunit_binary_str_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream); /** @@ -316,7 +299,7 @@ void kunit_binary_str_assert_format(const struct kunit_assert *assert, left_val, \ right_str, \ right_val) { \ - .assert = KUNIT_INIT_ASSERT_STRUCT(kunit_binary_str_assert_format), \ + .assert = { .format = kunit_binary_str_assert_format }, \ .operation = op_str, \ .left_text = left_str, \ .left_value = left_val, \ diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c index 9f4492a8e24e..c9c7ee0dfafa 100644 --- a/lib/kunit/assert.c +++ b/lib/kunit/assert.c @@ -30,22 +30,23 @@ void kunit_assert_prologue(const struct kunit_loc *loc, } EXPORT_SYMBOL_GPL(kunit_assert_prologue); -void kunit_assert_print_msg(const struct kunit_assert *assert, - struct string_stream *stream) +static void kunit_assert_print_msg(const struct va_format *message, + struct string_stream *stream) { - if (assert->message.fmt) - string_stream_add(stream, "\n%pV", &assert->message); + if (message->fmt) + string_stream_add(stream, "\n%pV", message); } -EXPORT_SYMBOL_GPL(kunit_assert_print_msg); void kunit_fail_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream) { - string_stream_add(stream, "%pV", &assert->message); + string_stream_add(stream, "%pV", message); } EXPORT_SYMBOL_GPL(kunit_fail_assert_format); void kunit_unary_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream) { struct kunit_unary_assert *unary_assert; @@ -60,11 +61,12 @@ void kunit_unary_assert_format(const struct kunit_assert *assert, string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s to be false, but is true\n", unary_assert->condition); - kunit_assert_print_msg(assert, stream); + kunit_assert_print_msg(message, stream); } EXPORT_SYMBOL_GPL(kunit_unary_assert_format); void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream) { struct kunit_ptr_not_err_assert *ptr_assert; @@ -82,7 +84,7 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, ptr_assert->text, PTR_ERR(ptr_assert->value)); } - kunit_assert_print_msg(assert, stream); + kunit_assert_print_msg(message, stream); } EXPORT_SYMBOL_GPL(kunit_ptr_not_err_assert_format); @@ -110,6 +112,7 @@ static bool is_literal(struct kunit *test, const char *text, long long value, } void kunit_binary_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream) { struct kunit_binary_assert *binary_assert; @@ -132,11 +135,12 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %lld", binary_assert->right_text, binary_assert->right_value); - kunit_assert_print_msg(assert, stream); + kunit_assert_print_msg(message, stream); } EXPORT_SYMBOL_GPL(kunit_binary_assert_format); void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream) { struct kunit_binary_ptr_assert *binary_assert; @@ -155,7 +159,7 @@ void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %px", binary_assert->right_text, binary_assert->right_value); - kunit_assert_print_msg(assert, stream); + kunit_assert_print_msg(message, stream); } EXPORT_SYMBOL_GPL(kunit_binary_ptr_assert_format); @@ -176,6 +180,7 @@ static bool is_str_literal(const char *text, const char *value) } void kunit_binary_str_assert_format(const struct kunit_assert *assert, + const struct va_format *message, struct string_stream *stream) { struct kunit_binary_str_assert *binary_assert; @@ -196,6 +201,6 @@ void kunit_binary_str_assert_format(const struct kunit_assert *assert, string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == \"%s\"", binary_assert->right_text, binary_assert->right_value); - kunit_assert_print_msg(assert, stream); + kunit_assert_print_msg(message, stream); } EXPORT_SYMBOL_GPL(kunit_binary_str_assert_format); diff --git a/lib/kunit/test.c b/lib/kunit/test.c index 7dec3248562f..3bca3bf5c15b 100644 --- a/lib/kunit/test.c +++ b/lib/kunit/test.c @@ -241,7 +241,8 @@ static void kunit_print_string_stream(struct kunit *test, } static void kunit_fail(struct kunit *test, const struct kunit_loc *loc, - enum kunit_assert_type type, struct kunit_assert *assert) + enum kunit_assert_type type, struct kunit_assert *assert, + const struct va_format *message) { struct string_stream *stream; @@ -257,7 +258,7 @@ static void kunit_fail(struct kunit *test, const struct kunit_loc *loc, } kunit_assert_prologue(loc, type, stream); - assert->format(assert, stream); + assert->format(assert, message, stream); kunit_print_string_stream(test, stream); @@ -284,12 +285,13 @@ void kunit_do_failed_assertion(struct kunit *test, const char *fmt, ...) { va_list args; + struct va_format message; va_start(args, fmt); - assert->message.fmt = fmt; - assert->message.va = &args; + message.fmt = fmt; + message.va = &args; - kunit_fail(test, loc, type, assert); + kunit_fail(test, loc, type, assert, &message); va_end(args); -- cgit v1.2.3-70-g09d2 From 2b6861e2372bac68861c54372f68f6016a7484fc Mon Sep 17 00:00:00 2001 From: Daniel Latypov Date: Tue, 25 Jan 2022 13:00:11 -0800 Subject: kunit: factor out str constants from binary assertion structs If the compiler doesn't optimize them away, each kunit assertion (use of KUNIT_EXPECT_EQ, etc.) can use 88 bytes of stack space in the worst and most common case. This has led to compiler warnings and a suggestion from Linus to move data from the structs into static const's where possible [1]. This builds upon [2] which did so for the base struct kunit_assert type. That only reduced sizeof(struct kunit_binary_assert) from 88 to 64. Given these are by far the most commonly used asserts, this patch factors out the textual representations of the operands and comparator into another static const, saving 16 more bytes. In detail, KUNIT_EXPECT_EQ(test, 2 + 2, 5) yields the following struct (struct kunit_binary_assert) { .assert = , .operation = "==", .left_text = "2 + 2", .left_value = 4, .right_text = "5", .right_value = 5, } After this change static const struct kunit_binary_assert_text __text = { .operation = "==", .left_text = "2 + 2", .right_text = "5", }; (struct kunit_binary_assert) { .assert = , .text = &__text, .left_value = 4, .right_value = 5, } This also DRYs the code a bit more since these str fields were repeated for the string and pointer versions of kunit_binary_assert. Note: we could name the kunit_binary_assert_text fields left/right instead of left_text/right_text. But that would require changing the macros a bit since they have args called "left" and "right" which would be substituted in `.left = #left` as `.2 + 2 = \"2 + 2\"`. [1] https://groups.google.com/g/kunit-dev/c/i3fZXgvBrfA/m/VULQg1z6BAAJ [2] https://lore.kernel.org/linux-kselftest/20220113165931.451305-6-dlatypov@google.com/ Signed-off-by: Daniel Latypov Reviewed-by: David Gow Reviewed-by: Brendan Higgins Signed-off-by: Shuah Khan --- include/kunit/assert.h | 49 ++++++++++++++++++++++--------------------------- include/kunit/test.h | 20 +++++++++++++------- lib/kunit/assert.c | 38 +++++++++++++++++++------------------- 3 files changed, 54 insertions(+), 53 deletions(-) (limited to 'lib') diff --git a/include/kunit/assert.h b/include/kunit/assert.h index 649bfac9f406..4b52e12c2ae8 100644 --- a/include/kunit/assert.h +++ b/include/kunit/assert.h @@ -150,14 +150,25 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, .value = val \ } +/** + * struct kunit_binary_assert_text - holds strings for &struct + * kunit_binary_assert and friends to try and make the structs smaller. + * @operation: A string representation of the comparison operator (e.g. "=="). + * @left_text: A string representation of the left expression (e.g. "2+2"). + * @right_text: A string representation of the right expression (e.g. "2+2"). + */ +struct kunit_binary_assert_text { + const char *operation; + const char *left_text; + const char *right_text; +}; + /** * struct kunit_binary_assert - An expectation/assertion that compares two * non-pointer values (for example, KUNIT_EXPECT_EQ(test, 1 + 1, 2)). * @assert: The parent of this type. - * @operation: A string representation of the comparison operator (e.g. "=="). - * @left_text: A string representation of the expression in the left slot. + * @text: Holds the textual representations of the operands and op (e.g. "=="). * @left_value: The actual evaluated value of the expression in the left slot. - * @right_text: A string representation of the expression in the right slot. * @right_value: The actual evaluated value of the expression in the right slot. * * Represents an expectation/assertion that compares two non-pointer values. For @@ -166,10 +177,8 @@ void kunit_ptr_not_err_assert_format(const struct kunit_assert *assert, */ struct kunit_binary_assert { struct kunit_assert assert; - const char *operation; - const char *left_text; + const struct kunit_binary_assert_text *text; long long left_value; - const char *right_text; long long right_value; }; @@ -182,10 +191,8 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, * kunit_binary_assert, kunit_binary_ptr_assert, etc. * * @format_func: a function which formats the assert to a string. - * @op_str: A string representation of the comparison operator (e.g. "=="). - * @left_str: A string representation of the expression in the left slot. + * @text_: Pointer to a kunit_binary_assert_text. * @left_val: The actual evaluated value of the expression in the left slot. - * @right_str: A string representation of the expression in the right slot. * @right_val: The actual evaluated value of the expression in the right slot. * * Initializes a binary assert like kunit_binary_assert, @@ -194,16 +201,12 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, * This is ultimately used by binary assertion macros like KUNIT_EXPECT_EQ, etc. */ #define KUNIT_INIT_BINARY_ASSERT_STRUCT(format_func, \ - op_str, \ - left_str, \ + text_, \ left_val, \ - right_str, \ right_val) { \ .assert = { .format = format_func }, \ - .operation = op_str, \ - .left_text = left_str, \ + .text = text_, \ .left_value = left_val, \ - .right_text = right_str, \ .right_value = right_val \ } @@ -211,10 +214,8 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, * struct kunit_binary_ptr_assert - An expectation/assertion that compares two * pointer values (for example, KUNIT_EXPECT_PTR_EQ(test, foo, bar)). * @assert: The parent of this type. - * @operation: A string representation of the comparison operator (e.g. "=="). - * @left_text: A string representation of the expression in the left slot. + * @text: Holds the textual representations of the operands and op (e.g. "=="). * @left_value: The actual evaluated value of the expression in the left slot. - * @right_text: A string representation of the expression in the right slot. * @right_value: The actual evaluated value of the expression in the right slot. * * Represents an expectation/assertion that compares two pointer values. For @@ -223,10 +224,8 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, */ struct kunit_binary_ptr_assert { struct kunit_assert assert; - const char *operation; - const char *left_text; + const struct kunit_binary_assert_text *text; const void *left_value; - const char *right_text; const void *right_value; }; @@ -238,10 +237,8 @@ void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, * struct kunit_binary_str_assert - An expectation/assertion that compares two * string values (for example, KUNIT_EXPECT_STREQ(test, foo, "bar")). * @assert: The parent of this type. - * @operation: A string representation of the comparison operator (e.g. "=="). - * @left_text: A string representation of the expression in the left slot. + * @text: Holds the textual representations of the operands and comparator. * @left_value: The actual evaluated value of the expression in the left slot. - * @right_text: A string representation of the expression in the right slot. * @right_value: The actual evaluated value of the expression in the right slot. * * Represents an expectation/assertion that compares two string values. For @@ -250,10 +247,8 @@ void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, */ struct kunit_binary_str_assert { struct kunit_assert assert; - const char *operation; - const char *left_text; + const struct kunit_binary_assert_text *text; const char *left_value; - const char *right_text; const char *right_value; }; diff --git a/include/kunit/test.h b/include/kunit/test.h index a93dfb8ff393..088ff394ae94 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -874,16 +874,19 @@ void kunit_do_failed_assertion(struct kunit *test, do { \ typeof(left) __left = (left); \ typeof(right) __right = (right); \ + static const struct kunit_binary_assert_text __text = { \ + .operation = #op, \ + .left_text = #left, \ + .right_text = #right, \ + }; \ \ KUNIT_ASSERTION(test, \ assert_type, \ __left op __right, \ assert_class, \ KUNIT_INIT_BINARY_ASSERT_STRUCT(format_func, \ - #op, \ - #left, \ + &__text, \ __left, \ - #right, \ __right), \ fmt, \ ##__VA_ARGS__); \ @@ -928,17 +931,20 @@ do { \ ...) \ do { \ const char *__left = (left); \ - const char *__right = (right); \ + const char *__right = (right); \ + static const struct kunit_binary_assert_text __text = { \ + .operation = #op, \ + .left_text = #left, \ + .right_text = #right, \ + }; \ \ KUNIT_ASSERTION(test, \ assert_type, \ strcmp(__left, __right) op 0, \ kunit_binary_str_assert, \ KUNIT_INIT_BINARY_ASSERT_STRUCT(kunit_binary_str_assert_format,\ - #op, \ - #left, \ + &__text, \ __left, \ - #right, \ __right), \ fmt, \ ##__VA_ARGS__); \ diff --git a/lib/kunit/assert.c b/lib/kunit/assert.c index c9c7ee0dfafa..d00d6d181ee8 100644 --- a/lib/kunit/assert.c +++ b/lib/kunit/assert.c @@ -122,18 +122,18 @@ void kunit_binary_assert_format(const struct kunit_assert *assert, string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n", - binary_assert->left_text, - binary_assert->operation, - binary_assert->right_text); - if (!is_literal(stream->test, binary_assert->left_text, + binary_assert->text->left_text, + binary_assert->text->operation, + binary_assert->text->right_text); + if (!is_literal(stream->test, binary_assert->text->left_text, binary_assert->left_value, stream->gfp)) string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %lld\n", - binary_assert->left_text, + binary_assert->text->left_text, binary_assert->left_value); - if (!is_literal(stream->test, binary_assert->right_text, + if (!is_literal(stream->test, binary_assert->text->right_text, binary_assert->right_value, stream->gfp)) string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %lld", - binary_assert->right_text, + binary_assert->text->right_text, binary_assert->right_value); kunit_assert_print_msg(message, stream); } @@ -150,14 +150,14 @@ void kunit_binary_ptr_assert_format(const struct kunit_assert *assert, string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n", - binary_assert->left_text, - binary_assert->operation, - binary_assert->right_text); + binary_assert->text->left_text, + binary_assert->text->operation, + binary_assert->text->right_text); string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %px\n", - binary_assert->left_text, + binary_assert->text->left_text, binary_assert->left_value); string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == %px", - binary_assert->right_text, + binary_assert->text->right_text, binary_assert->right_value); kunit_assert_print_msg(message, stream); } @@ -190,16 +190,16 @@ void kunit_binary_str_assert_format(const struct kunit_assert *assert, string_stream_add(stream, KUNIT_SUBTEST_INDENT "Expected %s %s %s, but\n", - binary_assert->left_text, - binary_assert->operation, - binary_assert->right_text); - if (!is_str_literal(binary_assert->left_text, binary_assert->left_value)) + binary_assert->text->left_text, + binary_assert->text->operation, + binary_assert->text->right_text); + if (!is_str_literal(binary_assert->text->left_text, binary_assert->left_value)) string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == \"%s\"\n", - binary_assert->left_text, + binary_assert->text->left_text, binary_assert->left_value); - if (!is_str_literal(binary_assert->right_text, binary_assert->right_value)) + if (!is_str_literal(binary_assert->text->right_text, binary_assert->right_value)) string_stream_add(stream, KUNIT_SUBSUBTEST_INDENT "%s == \"%s\"", - binary_assert->right_text, + binary_assert->text->right_text, binary_assert->right_value); kunit_assert_print_msg(message, stream); } -- cgit v1.2.3-70-g09d2 From d7fd696c12605b1666e9a2051e2ac896af103bfe Mon Sep 17 00:00:00 2001 From: David Gow Date: Fri, 25 Feb 2022 10:52:46 +0800 Subject: list: test: Add test for list_del_init_careful() 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 Reviewed-by: Andy Shevchenko Signed-off-by: Shuah Khan --- lib/list-test.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'lib') diff --git a/lib/list-test.c b/lib/list-test.c index ee09505df16f..302b7382bff4 100644 --- a/lib/list-test.c +++ b/lib/list-test.c @@ -161,6 +161,26 @@ 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) +{ + /* NOTE: This test only checks the behaviour of this function in + * isolation. It does not verify memory model guarantees. + */ + 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_careful(&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 +727,7 @@ 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), -- cgit v1.2.3-70-g09d2 From 37dc573c0a547e1aed0c9abb480fab797bd3833f Mon Sep 17 00:00:00 2001 From: David Gow Date: Fri, 25 Feb 2022 10:52:48 +0800 Subject: list: test: Add a test for list_is_head() 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 Acked-by: Daniel Latypov Acked-by: Brendan Higgins Reviewed-by: Andy Shevchenko Signed-off-by: Shuah Khan --- lib/list-test.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'lib') 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), -- cgit v1.2.3-70-g09d2 From 5debe5bfa02c4c8922bd2d0f82c9c3a70bec8944 Mon Sep 17 00:00:00 2001 From: David Gow Date: Fri, 25 Feb 2022 10:52:49 +0800 Subject: list: test: Add a test for list_entry_is_head() The list_entry_is_head() macro was added[1] after the list KUnit tests, so wasn't tested. Add a new KUnit test to complete the set. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e130816164e244b692921de49771eeb28205152d Signed-off-by: David Gow Acked-by: Daniel Latypov Acked-by: Brendan Higgins Reviewed-by: Andy Shevchenko Signed-off-by: Shuah Khan --- lib/list-test.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'lib') diff --git a/lib/list-test.c b/lib/list-test.c index 3870ebfd84aa..035ef6597640 100644 --- a/lib/list-test.c +++ b/lib/list-test.c @@ -549,6 +549,26 @@ static void list_test_list_entry(struct kunit *test) struct list_test_struct, list)); } +static void list_test_list_entry_is_head(struct kunit *test) +{ + struct list_test_struct test_struct1, test_struct2, test_struct3; + + INIT_LIST_HEAD(&test_struct1.list); + INIT_LIST_HEAD(&test_struct3.list); + + list_add_tail(&test_struct2.list, &test_struct1.list); + + KUNIT_EXPECT_TRUE_MSG(test, + list_entry_is_head((&test_struct1), &test_struct1.list, list), + "Head element of same list"); + KUNIT_EXPECT_FALSE_MSG(test, + list_entry_is_head((&test_struct2), &test_struct1.list, list), + "Non-head element of same list"); + KUNIT_EXPECT_FALSE_MSG(test, + list_entry_is_head((&test_struct3), &test_struct1.list, list), + "Head element of different list"); +} + static void list_test_list_first_entry(struct kunit *test) { struct list_test_struct test_struct1, test_struct2; @@ -764,6 +784,7 @@ static struct kunit_case list_test_cases[] = { 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_entry_is_head), KUNIT_CASE(list_test_list_first_entry), KUNIT_CASE(list_test_list_last_entry), KUNIT_CASE(list_test_list_first_entry_or_null), -- cgit v1.2.3-70-g09d2