Re: [PATCH V2 2/2] lib/test_bits.c: Add tests for GENMASK_U128()

Yury Norov
2024-07-30T18:20:38Z

On Thu, Jul 25, 2024 at 11:18:08AM +0530, Anshuman Khandual wrote:
> This adds GENMASK_U128() tests although currently only 64 bit wide masks
> are being tested.
>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
> lib/test_bits.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/lib/test_bits.c b/lib/test_bits.c
> index 01313980f175..f0d1033cf3c9 100644
> --- a/lib/test_bits.c
> +++ b/lib/test_bits.c
> @@ -39,6 +39,26 @@ static void genmask_ull_test(struct kunit *test)
> #endif
> }
>
> +#ifdef CONFIG_ARCH_SUPPORTS_INT128

Can you move this ifdefery inside the function scope, so that you'll
not have do it below in tests array declarattion?

> +static void genmask_u128_test(struct kunit *test)
> +{
> + /* Tests mask generation only when the mask width is within 64 bits */
> + KUNIT_EXPECT_EQ(test, 0x0000000000ff0000ULL, GENMASK_U128(87, 80) >> 64);
> + KUNIT_EXPECT_EQ(test, 0x0000000000ffffffULL, GENMASK_U128(87, 64) >> 64);
> + KUNIT_EXPECT_EQ(test, 0x0000000000000001ULL, GENMASK_U128(0, 0));
> + KUNIT_EXPECT_EQ(test, 0xffffffffffffffffULL, GENMASK_U128(63, 0));
> + KUNIT_EXPECT_EQ(test, 0xffffffffffffffffULL, GENMASK_U128(64, 0) >> 1);
> + KUNIT_EXPECT_EQ(test, 0x00000000ffffffffULL, GENMASK_U128(81, 50) >> 50);
> +
> +#ifdef TEST_GENMASK_FAILURES
> + /* these should fail compilation */
> + GENMASK_U128(0, 1);
> + GENMASK_U128(0, 10);
> + GENMASK_U128(9, 10);
> +#endif
> +}
> +#endif
> +
> static void genmask_input_check_test(struct kunit *test)
> {
> unsigned int x, y;
> @@ -56,12 +76,17 @@ static void genmask_input_check_test(struct kunit *test)
> /* Valid input */
> KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1));
> KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21));
> + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(100, 80));
> + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(110, 65));
> }
>
>
> static struct kunit_case bits_test_cases[] = {
> KUNIT_CASE(genmask_test),
> KUNIT_CASE(genmask_ull_test),
> +#ifdef CONFIG_ARCH_SUPPORTS_INT128
> + KUNIT_CASE(genmask_u128_test),
> +#endif
> KUNIT_CASE(genmask_input_check_test),
> {}
> };
> --
> 2.30.2