These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / tools / testing / selftests / futex / functional / futex_requeue_pi_mismatched_ops.c
1 /******************************************************************************
2  *
3  *   Copyright © International Business Machines  Corp., 2009
4  *
5  *   This program is free software;  you can redistribute it and/or modify
6  *   it under the terms of the GNU General Public License as published by
7  *   the Free Software Foundation; either version 2 of the License, or
8  *   (at your option) any later version.
9  *
10  * DESCRIPTION
11  *      1. Block a thread using FUTEX_WAIT
12  *      2. Attempt to use FUTEX_CMP_REQUEUE_PI on the futex from 1.
13  *      3. The kernel must detect the mismatch and return -EINVAL.
14  *
15  * AUTHOR
16  *      Darren Hart <dvhart@linux.intel.com>
17  *
18  * HISTORY
19  *      2009-Nov-9: Initial version by Darren Hart <dvhart@linux.intel.com>
20  *
21  *****************************************************************************/
22
23 #include <errno.h>
24 #include <getopt.h>
25 #include <pthread.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <time.h>
30 #include "futextest.h"
31 #include "logging.h"
32
33 futex_t f1 = FUTEX_INITIALIZER;
34 futex_t f2 = FUTEX_INITIALIZER;
35 int child_ret = 0;
36
37 void usage(char *prog)
38 {
39         printf("Usage: %s\n", prog);
40         printf("  -c    Use color\n");
41         printf("  -h    Display this help message\n");
42         printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
43                VQUIET, VCRITICAL, VINFO);
44 }
45
46 void *blocking_child(void *arg)
47 {
48         child_ret = futex_wait(&f1, f1, NULL, FUTEX_PRIVATE_FLAG);
49         if (child_ret < 0) {
50                 child_ret = -errno;
51                 error("futex_wait\n", errno);
52         }
53         return (void *)&child_ret;
54 }
55
56 int main(int argc, char *argv[])
57 {
58         int ret = RET_PASS;
59         pthread_t child;
60         int c;
61
62         while ((c = getopt(argc, argv, "chv:")) != -1) {
63                 switch (c) {
64                 case 'c':
65                         log_color(1);
66                         break;
67                 case 'h':
68                         usage(basename(argv[0]));
69                         exit(0);
70                 case 'v':
71                         log_verbosity(atoi(optarg));
72                         break;
73                 default:
74                         usage(basename(argv[0]));
75                         exit(1);
76                 }
77         }
78
79         printf("%s: Detect mismatched requeue_pi operations\n",
80                basename(argv[0]));
81
82         if (pthread_create(&child, NULL, blocking_child, NULL)) {
83                 error("pthread_create\n", errno);
84                 ret = RET_ERROR;
85                 goto out;
86         }
87         /* Allow the child to block in the kernel. */
88         sleep(1);
89
90         /*
91          * The kernel should detect the waiter did not setup the
92          * q->requeue_pi_key and return -EINVAL. If it does not,
93          * it likely gave the lock to the child, which is now hung
94          * in the kernel.
95          */
96         ret = futex_cmp_requeue_pi(&f1, f1, &f2, 1, 0, FUTEX_PRIVATE_FLAG);
97         if (ret < 0) {
98                 if (errno == EINVAL) {
99                         /*
100                          * The kernel correctly detected the mismatched
101                          * requeue_pi target and aborted. Wake the child with
102                          * FUTEX_WAKE.
103                          */
104                         ret = futex_wake(&f1, 1, FUTEX_PRIVATE_FLAG);
105                         if (ret == 1) {
106                                 ret = RET_PASS;
107                         } else if (ret < 0) {
108                                 error("futex_wake\n", errno);
109                                 ret = RET_ERROR;
110                         } else {
111                                 error("futex_wake did not wake the child\n", 0);
112                                 ret = RET_ERROR;
113                         }
114                 } else {
115                         error("futex_cmp_requeue_pi\n", errno);
116                         ret = RET_ERROR;
117                 }
118         } else if (ret > 0) {
119                 fail("futex_cmp_requeue_pi failed to detect the mismatch\n");
120                 ret = RET_FAIL;
121         } else {
122                 error("futex_cmp_requeue_pi found no waiters\n", 0);
123                 ret = RET_ERROR;
124         }
125
126         pthread_join(child, NULL);
127
128         if (!ret)
129                 ret = child_ret;
130
131  out:
132         /* If the kernel crashes, we shouldn't return at all. */
133         print_result(ret);
134         return ret;
135 }