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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9a11b49a IM |
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> | |
8bc3bcc9 | 14 | #include <linux/export.h> |
9a11b49a IM |
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 | */ | |
01a14bda | 25 | int debug_locks __read_mostly = 1; |
632ee200 | 26 | EXPORT_SYMBOL_GPL(debug_locks); |
9a11b49a IM |
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 | */ | |
01a14bda | 33 | int debug_locks_silent __read_mostly; |
040a0a37 | 34 | EXPORT_SYMBOL_GPL(debug_locks_silent); |
9a11b49a IM |
35 | |
36 | /* | |
37 | * Generic 'turn off all lock debugging' function: | |
38 | */ | |
49faa777 | 39 | int debug_locks_off(void) |
9a11b49a | 40 | { |
9506a742 | 41 | if (debug_locks && __debug_locks_off()) { |
9a11b49a IM |
42 | if (!debug_locks_silent) { |
43 | console_verbose(); | |
44 | return 1; | |
45 | } | |
46 | } | |
47 | return 0; | |
48 | } | |
040a0a37 | 49 | EXPORT_SYMBOL_GPL(debug_locks_off); |