debug_locks.c 1.1 KB

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  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. * We want to turn all lock-debugging facilities on/off at once,
  18. * via a global flag. The reason is that once a single bug has been
  19. * detected and reported, there might be cascade of followup bugs
  20. * that would just muddy the log. So we report the first one and
  21. * shut up after that.
  22. */
  23. int debug_locks = 1;
  24. /*
  25. * The locking-testsuite uses <debug_locks_silent> to get a
  26. * 'silent failure': nothing is printed to the console when
  27. * a locking bug is detected.
  28. */
  29. int debug_locks_silent;
  30. /*
  31. * Generic 'turn off all lock debugging' function:
  32. */
  33. int debug_locks_off(void)
  34. {
  35. if (xchg(&debug_locks, 0)) {
  36. if (!debug_locks_silent) {
  37. console_verbose();
  38. return 1;
  39. }
  40. }
  41. return 0;
  42. }