From: Rikard Falkeborn <rikard.falkeborn@xxxxxxxxx> Subject: lib/test_bits.c: add tests of GENMASK Add tests of GENMASK and GENMASK_ULL. A few test cases that should fail compilation are provided under #ifdef TEST_GENMASK_FAILURES [rd.dunlap@xxxxxxxxx: add MODULE_LICENSE()] Link: http://lkml.kernel.org/r/dfc74524-0789-2827-4eff-476ddab65699@xxxxxxxxx [weiyongjun1@xxxxxxxxxx: make some functions static] Link: http://lkml.kernel.org/r/20200702150336.4756-1-weiyongjun1@xxxxxxxxxx Link: http://lkml.kernel.org/r/20200621054210.14804-2-rikard.falkeborn@xxxxxxxxx Link: http://lkml.kernel.org/r/20200608221823.35799-2-rikard.falkeborn@xxxxxxxxx Signed-off-by: Rikard Falkeborn <rikard.falkeborn@xxxxxxxxx> Signed-off-by: Randy Dunlap <rd.dunlap@xxxxxxxxx> Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx> Suggested-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Cc: Emil Velikov <emil.l.velikov@xxxxxxxxx> Cc: Syed Nayyar Waris <syednwaris@xxxxxxxxx> Cc: Andy Shevchenko <andy.shevchenko@xxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Emil Velikov <emil.l.velikov@xxxxxxxxx> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Linus Walleij <linus.walleij@xxxxxxxxxx> Cc: William Breathitt Gray <vilhelm.gray@xxxxxxxxx> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/Kconfig.debug | 11 ++++++ lib/Makefile | 1 lib/test_bits.c | 75 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 87 insertions(+) --- a/lib/Kconfig.debug~bits-add-tests-of-genmask +++ a/lib/Kconfig.debug @@ -2236,6 +2236,17 @@ config LINEAR_RANGES_TEST If unsure, say N. +config BITS_TEST + tristate "KUnit test for bits.h" + depends on KUNIT + help + This builds the bits unit test. + Tests the logic of macros defined in bits.h. + For more information on KUnit and unit tests in general please refer + to the KUnit documentation in Documentation/dev-tools/kunit/. + + If unsure, say N. + config TEST_UDELAY tristate "udelay test driver" help --- a/lib/Makefile~bits-add-tests-of-genmask +++ a/lib/Makefile @@ -342,3 +342,4 @@ obj-$(CONFIG_PLDMFW) += pldmfw/ # KUnit tests obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o +obj-$(CONFIG_BITS_TEST) += test_bits.o --- /dev/null +++ a/lib/test_bits.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Test cases for functions and macros in bits.h + */ + +#include <kunit/test.h> +#include <linux/bits.h> + + +static void genmask_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, 1ul, GENMASK(0, 0)); + KUNIT_EXPECT_EQ(test, 3ul, GENMASK(1, 0)); + KUNIT_EXPECT_EQ(test, 6ul, GENMASK(2, 1)); + KUNIT_EXPECT_EQ(test, 0xFFFFFFFFul, GENMASK(31, 0)); + +#ifdef TEST_GENMASK_FAILURES + /* these should fail compilation */ + GENMASK(0, 1); + GENMASK(0, 10); + GENMASK(9, 10); +#endif + + +} + +static void genmask_ull_test(struct kunit *test) +{ + KUNIT_EXPECT_EQ(test, 1ull, GENMASK_ULL(0, 0)); + KUNIT_EXPECT_EQ(test, 3ull, GENMASK_ULL(1, 0)); + KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_ULL(39, 21)); + KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_ULL(63, 0)); + +#ifdef TEST_GENMASK_FAILURES + /* these should fail compilation */ + GENMASK_ULL(0, 1); + GENMASK_ULL(0, 10); + GENMASK_ULL(9, 10); +#endif +} + +static void genmask_input_check_test(struct kunit *test) +{ + unsigned int x, y; + int z, w; + + /* Unknown input */ + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, 0)); + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, x)); + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, y)); + + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, 0)); + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, z)); + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, w)); + + /* Valid input */ + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1)); + KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21)); +} + + +static struct kunit_case bits_test_cases[] = { + KUNIT_CASE(genmask_test), + KUNIT_CASE(genmask_ull_test), + KUNIT_CASE(genmask_input_check_test), + {} +}; + +static struct kunit_suite bits_test_suite = { + .name = "bits-test", + .test_cases = bits_test_cases, +}; +kunit_test_suite(bits_test_suite); + +MODULE_LICENSE("GPL"); _
