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lib/math: Add int_log test suite

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This commit introduces KUnit tests for the intlog2 and intlog10
functions, which compute logarithms in base 2 and base 10, respectively.
The tests cover a range of inputs to ensure the correctness of these
functions across common and edge cases.

Signed-off-by: Bruno Sobreira França <brunofrancadevsec@gmail.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Rae Moar <rmoar@google.com>
Link: https://lore.kernel.org/r/20241202075545.3648096-3-davidgow@google.com
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Bruno Sobreira França
2024-12-02 15:55:39 +08:00
committed by Kees Cook
parent 3e50ba8fc8
commit 84ec093f55
3 changed files with 86 additions and 0 deletions
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11
lib/Kconfig.debug
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@@ -3197,6 +3197,17 @@ config INT_SQRT_KUNIT_TEST
If unsure, say N
config INT_LOG_KUNIT_TEST
tristate "Integer log (int_log) test" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
This option enables the KUnit test suite for the int_log library, which
provides two functions to compute the integer logarithm in base 2 and
base 10, called respectively as intlog2 and intlog10.
If unsure, say N
endif # RUNTIME_TESTING_MENU
config ARCH_USE_MEMTEST

1
lib/math/tests/Makefile
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@@ -1,5 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-only
obj-$(CONFIG_INT_LOG_KUNIT_TEST) += int_log_kunit.o
obj-$(CONFIG_INT_POW_KUNIT_TEST) += int_pow_kunit.o
obj-$(CONFIG_INT_SQRT_KUNIT_TEST) += int_sqrt_kunit.o
obj-$(CONFIG_RATIONAL_KUNIT_TEST) += rational_kunit.o

74
lib/math/tests/int_log_kunit.c Normal file
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@@ -0,0 +1,74 @@
// SPDX-License-Identifier: GPL-2.0-only
#include <kunit/test.h>
#include <linux/int_log.h>
struct test_case_params {
u32 value;
unsigned int expected_result;
const char *name;
};
/* The expected result takes into account the log error */
static const struct test_case_params intlog2_params[] = {
{0, 0, "Log base 2 of 0"},
{1, 0, "Log base 2 of 1"},
{2, 16777216, "Log base 2 of 2"},
{3, 26591232, "Log base 2 of 3"},
{4, 33554432, "Log base 2 of 4"},
{8, 50331648, "Log base 2 of 8"},
{16, 67108864, "Log base 2 of 16"},
{32, 83886080, "Log base 2 of 32"},
{U32_MAX, 536870911, "Log base 2 of MAX"},
};
static const struct test_case_params intlog10_params[] = {
{0, 0, "Log base 10 of 0"},
{1, 0, "Log base 10 of 1"},
{6, 13055203, "Log base 10 of 6"},
{10, 16777225, "Log base 10 of 10"},
{100, 33554450, "Log base 10 of 100"},
{1000, 50331675, "Log base 10 of 1000"},
{10000, 67108862, "Log base 10 of 10000"},
{U32_MAX, 161614247, "Log base 10 of MAX"}
};
static void get_desc(const struct test_case_params *tc, char *desc)
{
strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE);
}
KUNIT_ARRAY_PARAM(intlog2, intlog2_params, get_desc);
static void intlog2_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, intlog2(tc->value));
}
KUNIT_ARRAY_PARAM(intlog10, intlog10_params, get_desc);
static void intlog10_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, intlog10(tc->value));
}
static struct kunit_case math_int_log_test_cases[] = {
KUNIT_CASE_PARAM(intlog2_test, intlog2_gen_params),
KUNIT_CASE_PARAM(intlog10_test, intlog10_gen_params),
{}
};
static struct kunit_suite int_log_test_suite = {
.name = "math-int_log",
.test_cases = math_int_log_test_cases,
};
kunit_test_suites(&int_log_test_suite);
MODULE_DESCRIPTION("math.int_log KUnit test suite");
MODULE_LICENSE("GPL");