1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Test cases for functions and macros in bits.h
4  */
5 
6 #include <kunit/test.h>
7 #include <linux/bits.h>
8 
9 
genmask_test(struct kunit * test)10 static void genmask_test(struct kunit *test)
11 {
12 	KUNIT_EXPECT_EQ(test, 1ul, GENMASK(0, 0));
13 	KUNIT_EXPECT_EQ(test, 3ul, GENMASK(1, 0));
14 	KUNIT_EXPECT_EQ(test, 6ul, GENMASK(2, 1));
15 	KUNIT_EXPECT_EQ(test, 0xFFFFFFFFul, GENMASK(31, 0));
16 
17 #ifdef TEST_GENMASK_FAILURES
18 	/* these should fail compilation */
19 	GENMASK(0, 1);
20 	GENMASK(0, 10);
21 	GENMASK(9, 10);
22 #endif
23 
24 
25 }
26 
genmask_ull_test(struct kunit * test)27 static void genmask_ull_test(struct kunit *test)
28 {
29 	KUNIT_EXPECT_EQ(test, 1ull, GENMASK_ULL(0, 0));
30 	KUNIT_EXPECT_EQ(test, 3ull, GENMASK_ULL(1, 0));
31 	KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_ULL(39, 21));
32 	KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_ULL(63, 0));
33 
34 #ifdef TEST_GENMASK_FAILURES
35 	/* these should fail compilation */
36 	GENMASK_ULL(0, 1);
37 	GENMASK_ULL(0, 10);
38 	GENMASK_ULL(9, 10);
39 #endif
40 }
41 
genmask_input_check_test(struct kunit * test)42 static void genmask_input_check_test(struct kunit *test)
43 {
44 	unsigned int x, y;
45 	int z, w;
46 
47 	/* Unknown input */
48 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, 0));
49 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, x));
50 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, y));
51 
52 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, 0));
53 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, z));
54 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, w));
55 
56 	/* Valid input */
57 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1));
58 	KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21));
59 }
60 
61 
62 static struct kunit_case bits_test_cases[] = {
63 	KUNIT_CASE(genmask_test),
64 	KUNIT_CASE(genmask_ull_test),
65 	KUNIT_CASE(genmask_input_check_test),
66 	{}
67 };
68 
69 static struct kunit_suite bits_test_suite = {
70 	.name = "bits-test",
71 	.test_cases = bits_test_cases,
72 };
73 kunit_test_suite(bits_test_suite);
74 
75 MODULE_LICENSE("GPL");
76