| Ingo Molnar | 9a11b49a | 2006-07-03 00:24:33 -0700 | [diff] [blame] | 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 | } |