LXR linux/lib/test

   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
  10static 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
  27static 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
  42static 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
  62static 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
  69static struct kunit_suite bits_test_suite = {
  70        .name = "bits-test",
  71        .test_cases = bits_test_cases,
  72};
  73kunit_test_suite(bits_test_suite);
  74
  75MODULE_LICENSE("GPL");
  76