1 // SPDX-License-Identifier: LGPL-2.1-or-later
2 /*
3 * Copyright (C) 2013 LG Electronics.
4 * Author: Joonsoo Kim
5 */
6
7 /*\
8 * [Description]
9 *
10 * Test to correct handling for reserve count. If no reserved mapping is
11 * created to reserved file region, it should be considered as reserve
12 * mapping. Otherwise, reserve count will be overflowed.
13 */
14
15 #include "hugetlb.h"
16
17 #define MNTPOINT "hugetlbfs/"
18 static long hpage_size;
19 static int fd = -1;
20
run_test(void)21 static void run_test(void)
22 {
23 unsigned long initial_resv, end_resv;
24 int fd;
25 char *p, *q;
26
27 initial_resv = SAFE_READ_MEMINFO(MEMINFO_HPAGE_RSVD);
28
29 fd = tst_creat_unlinked(MNTPOINT, 0);
30 p = SAFE_MMAP(NULL, hpage_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
31
32 q = SAFE_MMAP(NULL, hpage_size,
33 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERVE, fd, 0);
34
35 *q = 's';
36
37 SAFE_MUNMAP(p, hpage_size);
38 SAFE_MUNMAP(q, hpage_size);
39 SAFE_CLOSE(fd);
40
41 end_resv = SAFE_READ_MEMINFO(MEMINFO_HPAGE_RSVD);
42
43 TST_EXP_EQ_LU(initial_resv, end_resv);
44 }
45
setup(void)46 static void setup(void)
47 {
48 hpage_size = tst_get_hugepage_size();
49 }
50
cleanup(void)51 static void cleanup(void)
52 {
53 if (fd >= 0)
54 SAFE_CLOSE(fd);
55 }
56
57 static struct tst_test test = {
58 .needs_root = 1,
59 .mntpoint = MNTPOINT,
60 .needs_hugetlbfs = 1,
61 .needs_tmpdir = 1,
62 .setup = setup,
63 .cleanup = cleanup,
64 .test_all = run_test,
65 .hugepages = {2, TST_NEEDS},
66 };
67