lib/test_bits.c: add tests of GENMASK

Add tests of GENMASK and GENMASK_ULL.

A few test cases that should fail compilation are provided under #ifdef
TEST_GENMASK_FAILURES

[rd.dunlap@gmail.com: add MODULE_LICENSE()]
Link: http://lkml.kernel.org/r/dfc74524-0789-2827-4eff-476ddab65699@gmail.com
[weiyongjun1@huawei.com: make some functions static]
Link: http://lkml.kernel.org/r/20200702150336.4756-1-weiyongjun1@huawei.com
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Randy Dunlap <rd.dunlap@gmail.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Cc: Syed Nayyar Waris <syednwaris@gmail.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Link: http://lkml.kernel.org/r/20200621054210.14804-2-rikard.falkeborn@gmail.com
Link: http://lkml.kernel.org/r/20200608221823.35799-2-rikard.falkeborn@gmail.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 5c5fbcb..9ca1b11 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2236,6 +2236,17 @@ config LINEAR_RANGES_TEST
 
          If unsure, say N.
 
+config BITS_TEST
+       tristate "KUnit test for bits.h"
+       depends on KUNIT
+       help
+         This builds the bits unit test.
+         Tests the logic of macros defined in bits.h.
+         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

diff --git a/lib/Makefile b/lib/Makefile
index 9d1fd82..e290fc5 100644 (file)
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -342,3 +342,4 @@ obj-$(CONFIG_PLDMFW) += pldmfw/
 # KUnit tests
 obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
 obj-$(CONFIG_LINEAR_RANGES_TEST) += test_linear_ranges.o
+obj-$(CONFIG_BITS_TEST) += test_bits.o

diff --git a/lib/test_bits.c b/lib/test_bits.c
new file mode 100644 (file)
index 0000000..c9368a2
--- /dev/null
+++ b/lib/test_bits.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Test cases for functions and macros in bits.h
+ */
+
+#include <kunit/test.h>
+#include <linux/bits.h>
+
+
+static void genmask_test(struct kunit *test)
+{
+       KUNIT_EXPECT_EQ(test, 1ul, GENMASK(0, 0));
+       KUNIT_EXPECT_EQ(test, 3ul, GENMASK(1, 0));
+       KUNIT_EXPECT_EQ(test, 6ul, GENMASK(2, 1));
+       KUNIT_EXPECT_EQ(test, 0xFFFFFFFFul, GENMASK(31, 0));
+
+#ifdef TEST_GENMASK_FAILURES
+       /* these should fail compilation */
+       GENMASK(0, 1);
+       GENMASK(0, 10);
+       GENMASK(9, 10);
+#endif
+
+
+}
+
+static void genmask_ull_test(struct kunit *test)
+{
+       KUNIT_EXPECT_EQ(test, 1ull, GENMASK_ULL(0, 0));
+       KUNIT_EXPECT_EQ(test, 3ull, GENMASK_ULL(1, 0));
+       KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_ULL(39, 21));
+       KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_ULL(63, 0));
+
+#ifdef TEST_GENMASK_FAILURES
+       /* these should fail compilation */
+       GENMASK_ULL(0, 1);
+       GENMASK_ULL(0, 10);
+       GENMASK_ULL(9, 10);
+#endif
+}
+
+static void genmask_input_check_test(struct kunit *test)
+{
+       unsigned int x, y;
+       int z, w;
+
+       /* Unknown input */
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, 0));
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, x));
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, y));
+
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, 0));
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, z));
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, w));
+
+       /* Valid input */
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1));
+       KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21));
+}
+
+
+static struct kunit_case bits_test_cases[] = {
+       KUNIT_CASE(genmask_test),
+       KUNIT_CASE(genmask_ull_test),
+       KUNIT_CASE(genmask_input_check_test),
+       {}
+};
+
+static struct kunit_suite bits_test_suite = {
+       .name = "bits-test",
+       .test_cases = bits_test_cases,
+};
+kunit_test_suite(bits_test_suite);
+
+MODULE_LICENSE("GPL");