Root/lib/debug_locks.c

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;
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;
34
35/*
36 * Generic 'turn off all lock debugging' function:
37 */
38int debug_locks_off(void)
39{
40    if (__debug_locks_off()) {
41        if (!debug_locks_silent) {
42            oops_in_progress = 1;
43            console_verbose();
44            return 1;
45        }
46    }
47    return 0;
48}
49

Archive Download this file



interactive