lib/test_bits.c

   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
  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
  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
  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");