Commit | Line | Data |
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9a11b49a IM |
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 | } |