debug_locks.c 1.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * lib/debug_locks.c
  4. *
  5. * Generic place for common debugging facilities for various locks:
  6. * spinlocks, rwlocks, mutexes and rwsems.
  7. *
  8. * Started by Ingo Molnar:
  9. *
  10. * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
  11. */
  12. #include <linux/rwsem.h>
  13. #include <linux/mutex.h>
  14. #include <linux/export.h>
  15. #include <linux/spinlock.h>
  16. #include <linux/debug_locks.h>
  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 __read_mostly = 1;
  25. EXPORT_SYMBOL_GPL(debug_locks);
  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 __read_mostly;
  32. EXPORT_SYMBOL_GPL(debug_locks_silent);
  33. /*
  34. * Generic 'turn off all lock debugging' function:
  35. */
  36. int debug_locks_off(void)
  37. {
  38. if (debug_locks && __debug_locks_off() && !debug_locks_silent)
  39. return 1;
  40. return 0;
  41. }
  42. EXPORT_SYMBOL_GPL(debug_locks_off);