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

diff --git a/kernel/tools/testing/selftests/futex/functional/futex_requeue_pi_mismatched_ops.c b/kernel/tools/testing/selftests/futex/functional/futex_requeue_pi_mismatched_ops.c
new file mode 100644 (file)
index 0000000..d5e4f2c
--- /dev/null
+++ b/kernel/tools/testing/selftests/futex/functional/futex_requeue_pi_mismatched_ops.c
@@ -0,0 +1,135 @@
+/******************************************************************************
+ *
+ *   Copyright © International Business Machines  Corp., 2009
+ *
+ *   This program is free software;  you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ * DESCRIPTION
+ *      1. Block a thread using FUTEX_WAIT
+ *      2. Attempt to use FUTEX_CMP_REQUEUE_PI on the futex from 1.
+ *      3. The kernel must detect the mismatch and return -EINVAL.
+ *
+ * AUTHOR
+ *      Darren Hart <dvhart@linux.intel.com>
+ *
+ * HISTORY
+ *      2009-Nov-9: Initial version by Darren Hart <dvhart@linux.intel.com>
+ *
+ *****************************************************************************/
+
+#include <errno.h>
+#include <getopt.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include "futextest.h"
+#include "logging.h"
+
+futex_t f1 = FUTEX_INITIALIZER;
+futex_t f2 = FUTEX_INITIALIZER;
+int child_ret = 0;
+
+void usage(char *prog)
+{
+       printf("Usage: %s\n", prog);
+       printf("  -c    Use color\n");
+       printf("  -h    Display this help message\n");
+       printf("  -v L  Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
+              VQUIET, VCRITICAL, VINFO);
+}
+
+void *blocking_child(void *arg)
+{
+       child_ret = futex_wait(&f1, f1, NULL, FUTEX_PRIVATE_FLAG);
+       if (child_ret < 0) {
+               child_ret = -errno;
+               error("futex_wait\n", errno);
+       }
+       return (void *)&child_ret;
+}
+
+int main(int argc, char *argv[])
+{
+       int ret = RET_PASS;
+       pthread_t child;
+       int c;
+
+       while ((c = getopt(argc, argv, "chv:")) != -1) {
+               switch (c) {
+               case 'c':
+                       log_color(1);
+                       break;
+               case 'h':
+                       usage(basename(argv[0]));
+                       exit(0);
+               case 'v':
+                       log_verbosity(atoi(optarg));
+                       break;
+               default:
+                       usage(basename(argv[0]));
+                       exit(1);
+               }
+       }
+
+       printf("%s: Detect mismatched requeue_pi operations\n",
+              basename(argv[0]));
+
+       if (pthread_create(&child, NULL, blocking_child, NULL)) {
+               error("pthread_create\n", errno);
+               ret = RET_ERROR;
+               goto out;
+       }
+       /* Allow the child to block in the kernel. */
+       sleep(1);
+
+       /*
+        * The kernel should detect the waiter did not setup the
+        * q->requeue_pi_key and return -EINVAL. If it does not,
+        * it likely gave the lock to the child, which is now hung
+        * in the kernel.
+        */
+       ret = futex_cmp_requeue_pi(&f1, f1, &f2, 1, 0, FUTEX_PRIVATE_FLAG);
+       if (ret < 0) {
+               if (errno == EINVAL) {
+                       /*
+                        * The kernel correctly detected the mismatched
+                        * requeue_pi target and aborted. Wake the child with
+                        * FUTEX_WAKE.
+                        */
+                       ret = futex_wake(&f1, 1, FUTEX_PRIVATE_FLAG);
+                       if (ret == 1) {
+                               ret = RET_PASS;
+                       } else if (ret < 0) {
+                               error("futex_wake\n", errno);
+                               ret = RET_ERROR;
+                       } else {
+                               error("futex_wake did not wake the child\n", 0);
+                               ret = RET_ERROR;
+                       }
+               } else {
+                       error("futex_cmp_requeue_pi\n", errno);
+                       ret = RET_ERROR;
+               }
+       } else if (ret > 0) {
+               fail("futex_cmp_requeue_pi failed to detect the mismatch\n");
+               ret = RET_FAIL;
+       } else {
+               error("futex_cmp_requeue_pi found no waiters\n", 0);
+               ret = RET_ERROR;
+       }
+
+       pthread_join(child, NULL);
+
+       if (!ret)
+               ret = child_ret;
+
+ out:
+       /* If the kernel crashes, we shouldn't return at all. */
+       print_result(ret);
+       return ret;
+}