Re: [PATCH] lib/random32: convert selftest to KUnit

[Thomas Weißschuh]

On Sat, Jan 24, 2026 at 02:41:33PM +0900, Kir Chou wrote:
> This patch converts the existing prandom selftest (lib/random32.c) to use
> the KUnit framework (lib/tests/random32_kunit.c). Unlike typical KUnit
> tests, this file is directly #included into lib/random32.c.
> 
> Only the file name "random32_kunit.c" keeps random32, "prandom" is used
> for all other places for aligning with the API semantics and avoiding
> confusion with the cryptographically secure random.c,
> 
> The new test:
> - Removes the legacy CONFIG_RANDOM32_SELFTEST.

This bit seems to be missing from the patch.
'config RANDOM32_SELFTEST' still exists in lib/Kconfig.

> - Adds CONFIG_PRANDOM_KUNIT_TEST (defaulting to KUNIT_ALL_TESTS).
> - Moves the test logic to lib/tests/random32_kunit.c.
> - Updates arch/s390/configs/debug_defconfig to use the new KUnit symbol.
> 
> This commit is verified by `./tools/testing/kunit/kunit.py run`
> with the .kunit/.kunitconfig:
> 
> ```
> CONFIG_KUNIT=y
> CONFIG_PRANDOM_KUNIT_TEST=y
> ```
> 
> Signed-off-by: Kir Chou <note351@xxxxxxxxxxx>
> ---
>  arch/s390/configs/debug_defconfig |   2 +-
>  lib/Kconfig.debug                 |  12 +++
>  lib/random32.c                    | 173 +----------------------------
>  lib/tests/random32_kunit.c        | 174 ++++++++++++++++++++++++++++++
>  4 files changed, 189 insertions(+), 172 deletions(-)
>  create mode 100644 lib/tests/random32_kunit.c
> 

(...)

> diff --git a/lib/tests/random32_kunit.c b/lib/tests/random32_kunit.c
> new file mode 100644
> index 000000000..ee50205b8
> --- /dev/null
> +++ b/lib/tests/random32_kunit.c
> @@ -0,0 +1,174 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Test cases for random32 functions.
> + */
> +
> +#include <kunit/test.h>
> +
> +static struct prandom_test1 {
> +	u32 seed;
> +	u32 result;
> +} test1[] = {
> +	{ 1U, 3484351685U },
> +	{ 2U, 2623130059U },
> +	{ 3U, 3125133893U },
> +	{ 4U,  984847254U },
> +};
> +
> +static struct prandom_test2 {

These arrays can be 'const'.

> +	u32 seed;
> +	u32 iteration;
> +	u32 result;
> +} test2[] = {

(...)