The patch titled
Subject: lib/math/rational: add Kunit test cases
has been added to the -mm tree. Its filename is
lib-math-rational-add-kunit-test-cases.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/lib-math-rational-add-kunit-test-cases.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/lib-math-rational-add-kunit-test-cases.patch
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------------------------------------------------------
From: Trent Piepho <tpiepho@xxxxxxxxx>
Subject: lib/math/rational: add Kunit test cases
Adds a number of test cases that cover a range of possible code paths.
Link: https://lkml.kernel.org/r/20210525144250.214670-2-tpiepho@xxxxxxxxx
Signed-off-by: Trent Piepho <tpiepho@xxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Daniel Latypov <dlatypov@xxxxxxxxxx>
Cc: Oskar Schirmer <oskar@xxxxxxxxx>
Cc: Yiyuan Guo <yguoaz@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/Kconfig.debug | 12 +++++++
lib/math/Makefile | 1
lib/math/rational-test.c | 56 +++++++++++++++++++++++++++++++++++++
3 files changed, 69 insertions(+)
--- a/lib/Kconfig.debug~lib-math-rational-add-kunit-test-cases
+++ a/lib/Kconfig.debug
@@ -2447,6 +2447,18 @@ config SLUB_KUNIT_TEST
If unsure, say N.
+config RATIONAL_KUNIT_TEST
+ tristate "KUnit test for rational.c" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ select RATIONAL
+ default KUNIT_ALL_TESTS
+ help
+ This builds the rational math unit test.
+ 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/math/Makefile~lib-math-rational-add-kunit-test-cases
+++ a/lib/math/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_PRIME_NUMBERS) += prime_num
obj-$(CONFIG_RATIONAL) += rational.o
obj-$(CONFIG_TEST_DIV64) += test_div64.o
+obj-$(CONFIG_RATIONAL_KUNIT_TEST) += rational-test.o
--- /dev/null
+++ a/lib/math/rational-test.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <kunit/test.h>
+
+#include <linux/rational.h>
+
+struct rational_test_param {
+ unsigned long num, den;
+ unsigned long max_num, max_den;
+ unsigned long exp_num, exp_den;
+
+ const char *name;
+};
+
+static const struct rational_test_param test_parameters[] = {
+ { 1230, 10, 100, 20, 100, 1, "Exceeds bounds, semi-convergent term > ½ last term" },
+ { 34567,100, 120, 20, 120, 1, "Exceeds bounds, semi-convergent term < ½ last term" },
+ { 1, 30, 100, 10, 0, 1, "Closest to zero" },
+ { 1, 19, 100, 10, 1, 10, "Closest to smallest non-zero" },
+ { 27,32, 16, 16, 11, 13, "Use convergent" },
+ { 1155, 7735, 255, 255, 33, 221, "Exact answer" },
+ { 87, 32, 70, 32, 68, 25, "Semiconvergent, numerator limit" },
+ { 14533, 4626, 15000, 2400, 7433, 2366, "Semiconvergent, demominator limit" },
+};
+
+static void get_desc(const struct rational_test_param *param, char *desc)
+{
+ strscpy(desc, param->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+/* Creates function rational_gen_params */
+KUNIT_ARRAY_PARAM(rational, test_parameters, get_desc);
+
+static void rational_test(struct kunit *test)
+{
+ const struct rational_test_param *param = (const struct rational_test_param *)test->param_value;
+ unsigned long n = 0, d = 0;
+
+ rational_best_approximation(param->num, param->den, param->max_num, param->max_den, &n, &d);
+ KUNIT_EXPECT_EQ(test, n, param->exp_num);
+ KUNIT_EXPECT_EQ(test, d, param->exp_den);
+}
+
+static struct kunit_case rational_test_cases[] = {
+ KUNIT_CASE_PARAM(rational_test, rational_gen_params),
+ {}
+};
+
+static struct kunit_suite rational_test_suite = {
+ .name = "rational",
+ .test_cases = rational_test_cases,
+};
+
+kunit_test_suites(&rational_test_suite);
+
+MODULE_LICENSE("GPL v2");
_
Patches currently in -mm which might be from tpiepho@xxxxxxxxx are
lib-math-rationalc-fix-divide-by-zero.patch
lib-math-rational-add-kunit-test-cases.patch
