1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * lib/debug_locks.c
4 *
5 * Generic place for common debugging facilities for various locks:
6 * spinlocks, rwlocks, mutexes and rwsems.
7 *
8 * Started by Ingo Molnar:
9 *
10 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
11 */
12 #include <linux/rwsem.h>
13 #include <linux/mutex.h>
14 #include <linux/export.h>
15 #include <linux/spinlock.h>
16 #include <linux/debug_locks.h>
17
18 /*
19 * We want to turn all lock-debugging facilities on/off at once,
20 * via a global flag. The reason is that once a single bug has been
21 * detected and reported, there might be cascade of followup bugs
22 * that would just muddy the log. So we report the first one and
23 * shut up after that.
24 */
25 int debug_locks __read_mostly = 1;
26 EXPORT_SYMBOL_GPL(debug_locks);
27
28 /*
29 * The locking-testsuite uses <debug_locks_silent> to get a
30 * 'silent failure': nothing is printed to the console when
31 * a locking bug is detected.
32 */
33 int debug_locks_silent __read_mostly;
34 EXPORT_SYMBOL_GPL(debug_locks_silent);
35
36 /*
37 * Generic 'turn off all lock debugging' function:
38 */
39 int debug_locks_off(void)
40 {
41 if (debug_locks && __debug_locks_off()) {
42 if (!debug_locks_silent) {
43 console_verbose();
44 return 1;
45 }
46 }
47 return 0;
48 }
49 EXPORT_SYMBOL_GPL(debug_locks_off);
50
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