Branch data Line data Source code
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/export.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 : : EXPORT_SYMBOL_GPL(debug_locks);
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 : : EXPORT_SYMBOL_GPL(debug_locks_silent);
34 : :
35 : : /*
36 : : * Generic 'turn off all lock debugging' function:
37 : : */
38 : 0 : int debug_locks_off(void)
39 : : {
40 [ # # ]: 0 : if (__debug_locks_off()) {
41 [ # # ]: 0 : if (!debug_locks_silent) {
42 : : console_verbose();
43 : : return 1;
44 : : }
45 : : }
46 : : return 0;
47 : : }
48 : : EXPORT_SYMBOL_GPL(debug_locks_off);
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