LXR linux/lib/debug

   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 */
  24int 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 */
  31int debug_locks_silent;
  32
  33/*
  34 * Generic 'turn off all lock debugging' function:
  35 */
  36int 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}
  46