the-tree/lib/test_bits.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002 /*
0003  * Test cases for functions and macros in bits.h
0004  */
0005
0006 #include <kunit/test.h>
0007 #include <linux/bits.h>
0008
0009
0010 static void genmask_test(struct kunit *test)
0011 {
0012     KUNIT_EXPECT_EQ(test, 1ul, GENMASK(0, 0));
0013     KUNIT_EXPECT_EQ(test, 3ul, GENMASK(1, 0));
0014     KUNIT_EXPECT_EQ(test, 6ul, GENMASK(2, 1));
0015     KUNIT_EXPECT_EQ(test, 0xFFFFFFFFul, GENMASK(31, 0));
0016
0017 #ifdef TEST_GENMASK_FAILURES
0018     /* these should fail compilation */
0019     GENMASK(0, 1);
0020     GENMASK(0, 10);
0021     GENMASK(9, 10);
0022 #endif
0023
0024
0025 }
0026
0027 static void genmask_ull_test(struct kunit *test)
0028 {
0029     KUNIT_EXPECT_EQ(test, 1ull, GENMASK_ULL(0, 0));
0030     KUNIT_EXPECT_EQ(test, 3ull, GENMASK_ULL(1, 0));
0031     KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_ULL(39, 21));
0032     KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_ULL(63, 0));
0033
0034 #ifdef TEST_GENMASK_FAILURES
0035     /* these should fail compilation */
0036     GENMASK_ULL(0, 1);
0037     GENMASK_ULL(0, 10);
0038     GENMASK_ULL(9, 10);
0039 #endif
0040 }
0041
0042 static void genmask_input_check_test(struct kunit *test)
0043 {
0044     unsigned int x, y;
0045     int z, w;
0046
0047     /* Unknown input */
0048     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, 0));
0049     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, x));
0050     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, y));
0051
0052     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, 0));
0053     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, z));
0054     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, w));
0055
0056     /* Valid input */
0057     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1));
0058     KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21));
0059 }
0060
0061
0062 static struct kunit_case bits_test_cases[] = {
0063     KUNIT_CASE(genmask_test),
0064     KUNIT_CASE(genmask_ull_test),
0065     KUNIT_CASE(genmask_input_check_test),
0066     {}
0067 };
0068
0069 static struct kunit_suite bits_test_suite = {
0070     .name = "bits-test",
0071     .test_cases = bits_test_cases,
0072 };
0073 kunit_test_suite(bits_test_suite);
0074
0075 MODULE_LICENSE("GPL");