[LTP] [PATCH v4 1/4] syscalls/madvise04: new test for madvise(MADV_DONTNEED)

[Zhao Gongyi]

Check that madvise(2) MADV_DONTNEED operation applied to Huge
TLB pages successfully after kernel version 5.18, and will result
in zero-fill-on-demand pages for anonymous private mappings.

Signed-off-by: Zhao Gongyi <zhaogongyi@huawei.com>
---
 runtest/syscalls                              |  1 +
 testcases/kernel/syscalls/madvise/.gitignore  |  1 +
 testcases/kernel/syscalls/madvise/madvise04.c | 62 +++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 testcases/kernel/syscalls/madvise/madvise04.c

diff --git a/runtest/syscalls b/runtest/syscalls
index c81764df4..eb1910cec 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -941,6 +941,7 @@ mincore04 mincore04
 madvise01 madvise01
 madvise02 madvise02
 madvise03 madvise03
+madvise04 madvise04
 madvise05 madvise05
 madvise06 madvise06
 madvise07 madvise07
diff --git a/testcases/kernel/syscalls/madvise/.gitignore b/testcases/kernel/syscalls/madvise/.gitignore
index f4bfdfefe..db8ce47c1 100644
--- a/testcases/kernel/syscalls/madvise/.gitignore
+++ b/testcases/kernel/syscalls/madvise/.gitignore
@@ -1,6 +1,7 @@
 /madvise01
 /madvise02
 /madvise03
+/madvise04
 /madvise05
 /madvise06
 /madvise07
diff --git a/testcases/kernel/syscalls/madvise/madvise04.c b/testcases/kernel/syscalls/madvise/madvise04.c
new file mode 100644
index 000000000..a970fb33e
--- /dev/null
+++ b/testcases/kernel/syscalls/madvise/madvise04.c
@@ -0,0 +1,62 @@
+// 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]
+ *
+ * Check that madvise(2) MADV_DONTNEED operation applied to Huge TLB pages
+ * successfully after kernel version 5.18, and will result in
+ * zero-fill-on-demand pages for anonymous private mappings.
+ */
+
+#include "tst_test.h"
+
+#define MAP_SIZE (8 * 1024)
+
+static char *addr;
+static int mapsz;
+
+static void run(void)
+{
+	TST_EXP_PASS(madvise(addr, mapsz, MADV_DONTNEED));
+	for (int i = 0; i < mapsz; i++) {
+		if (addr[i]) {
+			tst_res(TFAIL,
+				"There are no zero-fill-on-demand pages "
+				"for anonymous private mappings");
+			return;
+		}
+	}
+
+	tst_res(TPASS, "There are zero-fill-on-demand pages "
+		       "for anonymous private mappings");
+}
+
+static void setup(void)
+{
+	mapsz = tst_get_hugepage_size();
+	addr = SAFE_MMAP(NULL, mapsz,
+			PROT_READ | PROT_WRITE,
+			MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB,
+			-1, 0);
+	memset(addr, 1, mapsz);
+}
+
+static void cleanup(void)
+{
+	if (addr)
+		SAFE_MUNMAP(addr, mapsz);
+}
+
+static struct tst_test test = {
+	.test_all = run,
+	.setup = setup,
+	.cleanup = cleanup,
+	.min_kver = "5.18",
+	.needs_root = 1,
+	.hugepages = {1, TST_NEEDS},
+};
+
--
2.17.1