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/kernel.h>
12 #include <linux/rwsem.h>
13 #include <linux/mutex.h>
14 #include <linux/module.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 = 1;
26
27 /*
28 * The locking-testsuite uses <debug_locks_silent> to get a
29 * 'silent failure': nothing is printed to the console when
30 * a locking bug is detected.
31 */
32 int debug_locks_silent;
33
34 /*
35 * Generic 'turn off all lock debugging' function:
36 */
37 int debug_locks_off(void)
38 {
39 if (__debug_locks_off()) {
40 if (!debug_locks_silent) {
41 oops_in_progress = 1;
42 console_verbose();
43 return 1;
44 }
45 }
46 return 0;
47 }
48
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