[PATCH 4/4] kmsan: add memsetXX tests

[Alexander Potapenko <glider@google.com>]

Add tests ensuring that memset16()/memset32()/memset64() are
instrumented by KMSAN and correctly initialize the memory.

Signed-off-by: Alexander Potapenko <glider@google.com>
---
v2:
 - drop a redundant parameter of DEFINE_TEST_MEMSETXX()
---
 mm/kmsan/kmsan_test.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/mm/kmsan/kmsan_test.c b/mm/kmsan/kmsan_test.c
index aeddfdd4f679f..7095d3fbb23ac 100644
--- a/mm/kmsan/kmsan_test.c
+++ b/mm/kmsan/kmsan_test.c
@@ -504,6 +504,25 @@ static void test_memcpy_aligned_to_unaligned2(struct kunit *test)
 	KUNIT_EXPECT_TRUE(test, report_matches(&expect));
 }
 
+/* Generate test cases for memset16(), memset32(), memset64(). */
+#define DEFINE_TEST_MEMSETXX(size)                                          \
+	static void test_memset##size(struct kunit *test)                   \
+	{                                                                   \
+		EXPECTATION_NO_REPORT(expect);                              \
+		volatile uint##size##_t uninit;                             \
+                                                                            \
+		kunit_info(test,                                            \
+			   "memset" #size "() should initialize memory\n"); \
+		DO_NOT_OPTIMIZE(uninit);                                    \
+		memset##size((uint##size##_t *)&uninit, 0, 1);              \
+		kmsan_check_memory((void *)&uninit, sizeof(uninit));        \
+		KUNIT_EXPECT_TRUE(test, report_matches(&expect));           \
+	}
+
+DEFINE_TEST_MEMSETXX(16)
+DEFINE_TEST_MEMSETXX(32)
+DEFINE_TEST_MEMSETXX(64)
+
 static noinline void fibonacci(int *array, int size, int start)
 {
 	if (start < 2 || (start == size))
@@ -550,6 +569,9 @@ static struct kunit_case kmsan_test_cases[] = {
 	KUNIT_CASE(test_memcpy_aligned_to_aligned),
 	KUNIT_CASE(test_memcpy_aligned_to_unaligned),
 	KUNIT_CASE(test_memcpy_aligned_to_unaligned2),
+	KUNIT_CASE(test_memset16),
+	KUNIT_CASE(test_memset32),
+	KUNIT_CASE(test_memset64),
 	KUNIT_CASE(test_long_origin_chain),
 	{},
 };
-- 
2.40.0.rc0.216.gc4246ad0f0-goog