linux/lib/debug_locks.c
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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/kernel.h>
  12#include <linux/rwsem.h>
  13#include <linux/mutex.h>
  14#include <linux/module.h>
  15#include <linux/spinlock.h>
  16#include <linux/debug_locks.h>
  17
  18/*
  19 * We want to turn all lock-debugging facilities on/off at once,
  20 * via a global flag. The reason is that once a single bug has been
  21 * detected and reported, there might be cascade of followup bugs
  22 * that would just muddy the log. So we report the first one and
  23 * shut up after that.
  24 */
  25int debug_locks = 1;
  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 */
  32int debug_locks_silent;
  33
  34/*
  35 * Generic 'turn off all lock debugging' function:
  36 */
  37int debug_locks_off(void)
  38{
  39        if (xchg(&debug_locks, 0)) {
  40                if (!debug_locks_silent) {
  41                        oops_in_progress = 1;
  42                        console_verbose();
  43                        return 1;
  44                }
  45        }
  46        return 0;
  47}
  48
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