[LTP] [PATCH] syscalls/madvise11: new test for madvise(MADV_DONTNEED)

[Zhao Gongyi]

Test cases for madvise(2) system call, advise value as "MADV_MADV_DONTNEED":
1. After a successful MADV_DONTNEED operation, it will result in
zero-fill-on-demand pages for anonymous private mappings
2. MADV_DONTNEED cannot be applied to Huge TLB pages

Signed-off-by: Zhao Gongyi <zhaogongyi@huawei.com>
---
 runtest/syscalls                              |  1 +
 testcases/kernel/syscalls/madvise/.gitignore  |  1 +
 testcases/kernel/syscalls/madvise/madvise11.c | 87 +++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 testcases/kernel/syscalls/madvise/madvise11.c

diff --git a/runtest/syscalls b/runtest/syscalls
index 61a7b7677..a8ed9d65e 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -946,6 +946,7 @@ madvise07 madvise07
 madvise08 madvise08
 madvise09 madvise09
 madvise10 madvise10
+madvise11 madvise11

 newuname01 newuname01

diff --git a/testcases/kernel/syscalls/madvise/.gitignore b/testcases/kernel/syscalls/madvise/.gitignore
index 002d8e5d9..6e5b92ab7 100644
--- a/testcases/kernel/syscalls/madvise/.gitignore
+++ b/testcases/kernel/syscalls/madvise/.gitignore
@@ -6,3 +6,4 @@
 /madvise08
 /madvise09
 /madvise10
+/madvise11
diff --git a/testcases/kernel/syscalls/madvise/madvise11.c b/testcases/kernel/syscalls/madvise/madvise11.c
new file mode 100644
index 000000000..358c07d3a
--- /dev/null
+++ b/testcases/kernel/syscalls/madvise/madvise11.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) Huawei Technologies Co., Ltd. 2022. All rights reserved.
+ * Author: Zhao Gongyi <zhaogongyi@huawei.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * Test cases for madvise(2) system call, advise value as "MADV_MADV_DONTNEED":
+ * 1. After a successful MADV_DONTNEED operation, it will result in
+ *    zero-fill-on-demand pages for anonymous private mappings
+ * 2. MADV_DONTNEED cannot be applied to Huge TLB pages
+ */
+
+#include "tst_test.h"
+
+#define MAP_SIZE (8 * 1024)
+
+static char *addr;
+
+static void test_madvise01(void)
+{
+	int i;
+
+	addr = SAFE_MMAP(NULL, MAP_SIZE,
+			PROT_READ | PROT_WRITE,
+			MAP_PRIVATE | MAP_ANONYMOUS,
+			-1, 0);
+	memset(addr, 1, MAP_SIZE);
+
+	TEST(madvise(addr, MAP_SIZE, MADV_DONTNEED));
+	if (TST_RET == -1) {
+		tst_brk(TBROK | TTERRNO, "madvise(%p, %d, 0x%x) failed",
+			addr, MAP_SIZE, MADV_DONTNEED);
+	}
+
+	for (i = 0; i < MAP_SIZE; i++) {
+		if (addr[i]) {
+			tst_res(TFAIL,
+				"There are no zero-fill-on-demand pages "
+				"for anonymous private mappings");
+			break;
+		}
+	}
+
+	if (i == MAP_SIZE) {
+		tst_res(TPASS,
+			"There are zero-fill-on-demand pages "
+			"for anonymous private mappings");
+	}
+
+	SAFE_MUNMAP(addr, MAP_SIZE);
+}
+
+static void test_madvise02(void)
+{
+	int mapsz = tst_get_hugepage_size();
+
+	addr = SAFE_MMAP(NULL, mapsz,
+			PROT_READ | PROT_WRITE,
+			MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
+			-1, 0);
+
+	TEST(madvise(addr, mapsz, MADV_DONTNEED));
+	if (TST_RET != -1) {
+		tst_res(TFAIL, "madvise(%p, %d, 0x%x) succeed unexpectedly",
+			addr, mapsz, MADV_DONTNEED);
+	} else {
+		tst_res(TPASS, "madvise test for 'MADV_DONTNEED' passed");
+	}
+
+	SAFE_MUNMAP(addr, mapsz);
+}
+
+static void test_madvise(void)
+{
+	test_madvise01();
+	test_madvise02();
+}
+
+static struct tst_test test = {
+	.test_all = test_madvise,
+	.needs_root = 1,
+	.hugepages = {1, TST_NEEDS},
+};
+
--
2.17.1