LXR linux/lib/debug

   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/*
  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 __read_mostly = 1;
  26EXPORT_SYMBOL_GPL(debug_locks);
  27
  28/*
  29 * The locking-testsuite uses <debug_locks_silent> to get a
  30 * 'silent failure': nothing is printed to the console when
  31 * a locking bug is detected.
  32 */
  33int debug_locks_silent __read_mostly;
  34EXPORT_SYMBOL_GPL(debug_locks_silent);
  35
  36/*
  37 * Generic 'turn off all lock debugging' function:
  38 */
  39int debug_locks_off(void)
  40{
  41        if (debug_locks && __debug_locks_off()) {
  42                if (!debug_locks_silent) {
  43                        console_verbose();
  44                        return 1;
  45                }
  46        }
  47        return 0;
  48}
  49EXPORT_SYMBOL_GPL(debug_locks_off);
  50