1 /*
2 * lib/debug_locks.c
3 *
4 * Generic place for common debugging facilities for various locks:
5 * spinlocks, rwlocks, mutexes and rwsems.
6 *
7 * Started by Ingo Molnar:
8 *
9 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
10 */
11 #include <linux/rwsem.h>
12 #include <linux/mutex.h>
13 #include <linux/module.h>
14 #include <linux/spinlock.h>
15 #include <linux/debug_locks.h>
16
17 /*
18 * We want to turn all lock-debugging facilities on/off at once,
19 * via a global flag. The reason is that once a single bug has been
20 * detected and reported, there might be cascade of followup bugs
21 * that would just muddy the log. So we report the first one and
22 * shut up after that.
23 */
24 int debug_locks = 1;
25
26 /*
27 * The locking-testsuite uses <debug_locks_silent> to get a
28 * 'silent failure': nothing is printed to the console when
29 * a locking bug is detected.
30 */
31 int debug_locks_silent;
32
33 /*
34 * Generic 'turn off all lock debugging' function:
35 */
36 int debug_locks_off(void)
37 {
38 if (xchg(&debug_locks, 0)) {
39 if (!debug_locks_silent) {
40 console_verbose();
41 return 1;
42 }
43 }
44 return 0;
45 }
46
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