Re: [PATCH v3] lib/math: Add int_sqrt test suite

Shuah Khan
2024-10-31T17:50:20Z

On 10/30/24 07:43, Luis Felipe Hernandez wrote:
> Adds test suite for integer based square root function.
>
> The test suite is designed to verify the correctness of the int_sqrt()
> math library function.
>
> Signed-off-by: Luis Felipe Hernandez <luis.hernandez093@gmail.com>
> ---
> Changes in v2
> - Add new line at the end of int_sqrt_kunit.c
> - Add explicit header includes for MODULE_* macros, strscpy, and ULONG_MAX
>
> Changes in v3
> - Remove unnecesary new line after Kconfig entry for INT_SQRT_KUNIT_TEST
> - Correct int_sqrt instances with int_sqrt() in commit message and kconfig
> entry desc
> - Fix limits.h header include path

Adding Andrew to the thread. I think this depends on the other lib kunit
content that is already in next.

> ---
> lib/Kconfig.debug | 15 ++++++++++
> lib/math/Makefile | 1 +
> lib/math/tests/Makefile | 1 +
> lib/math/tests/int_sqrt_kunit.c | 51 +++++++++++++++++++++++++++++++++
> 4 files changed, 68 insertions(+)
> create mode 100644 lib/math/tests/int_sqrt_kunit.c
>
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 7312ae7c3cc5..c83f5dc9bb48 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -2993,6 +2993,21 @@ config TEST_OBJPOOL
>
> If unsure, say N.
>
> +config INT_SQRT_KUNIT_TEST
> + tristate "Integer square root test test" if !KUNIT_ALL_TESTS
> + depends on KUNIT
> + default KUNIT_ALL_TESTS
> + help
> + This option enables the KUnit test suite for the int_sqrt() function,
> + which performs square root calculation. The test suite checks
> + various scenarios, including edge cases, to ensure correctness.
> +
> + Enabling this option will include tests that check various scenarios
> + and edge cases to ensure the accuracy and reliability of the square root
> + function.
> +
> + If unsure, say N
> +
> endif # RUNTIME_TESTING_MENU
>
> config ARCH_USE_MEMTEST
> diff --git a/lib/math/Makefile b/lib/math/Makefile
> index 3ef11305f8d2..25bcb968b369 100644
> --- a/lib/math/Makefile
> +++ b/lib/math/Makefile
> @@ -9,3 +9,4 @@ obj-$(CONFIG_INT_POW_TEST) += tests/int_pow_kunit.o
> obj-$(CONFIG_TEST_DIV64) += test_div64.o
> obj-$(CONFIG_TEST_MULDIV64) += test_mul_u64_u64_div_u64.o
> obj-$(CONFIG_RATIONAL_KUNIT_TEST) += rational-test.o
> +obj-y += tests/
> diff --git a/lib/math/tests/Makefile b/lib/math/tests/Makefile
> index 6a169123320a..e1a79f093b2d 100644
> --- a/lib/math/tests/Makefile
> +++ b/lib/math/tests/Makefile
> @@ -1,3 +1,4 @@
> # SPDX-License-Identifier: GPL-2.0-only
>
> obj-$(CONFIG_INT_POW_TEST) += int_pow_kunit.o
> +obj-$(CONFIG_INT_SQRT_KUNIT_TEST) += int_sqrt_kunit.o
> diff --git a/lib/math/tests/int_sqrt_kunit.c b/lib/math/tests/int_sqrt_kunit.c
> new file mode 100644
> index 000000000000..3590142d2012
> --- /dev/null
> +++ b/lib/math/tests/int_sqrt_kunit.c
> @@ -0,0 +1,51 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +#include <kunit/test.h>
> +#include <linux/limits.h>
> +#include <linux/math.h>
> +#include <linux/module.h>
> +#include <linux/string.h>
> +
> +struct test_case_params {
> + unsigned long x;
> + unsigned long expected_result;
> + const char *name;
> +};
> +
> +static const struct test_case_params params[] = {
> + { 0, 0, "edge-case: square root of 0" },
> + { 4, 2, "perfect square: square root of 4" },
> + { 81, 9, "perfect square: square root of 9" },
> + { 2, 1, "non-perfect square: square root of 2" },
> + { 5, 2, "non-perfect square: square root of 5"},
> + { ULONG_MAX, 4294967295, "large input"},
> +};
> +
> +static void get_desc(const struct test_case_params *tc, char *desc)
> +{
> + strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE);
> +}
> +
> +KUNIT_ARRAY_PARAM(int_sqrt, params, get_desc);
> +
> +static void int_sqrt_test(struct kunit *test)
> +{
> + const struct test_case_params *tc = (const struct test_case_params *)test->param_value;
> +
> + KUNIT_EXPECT_EQ(test, tc->expected_result, int_sqrt(tc->x));
> +}
> +
> +static struct kunit_case math_int_sqrt_test_cases[] = {
> + KUNIT_CASE_PARAM(int_sqrt_test, int_sqrt_gen_params),
> + {}
> +};
> +
> +static struct kunit_suite int_sqrt_test_suite = {
> + .name = "math-int_sqrt",
> + .test_cases = math_int_sqrt_test_cases,
> +};
> +
> +kunit_test_suites(&int_sqrt_test_suite);
> +
> +MODULE_DESCRIPTION("math.int_sqrt KUnit test suite");
> +MODULE_LICENSE("GPL");

Acked-by: Shuah Khan <skhan@linuxfoundation.org>

thanks,
-- Shuah