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* lib/debug_locks.c
* Generic place for common debugging facilities for various locks:
* spinlocks, rwlocks, mutexes and rwsems.
* Started by Ingo Molnar:
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <>
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <linux/export.h>
#include <linux/spinlock.h>
#include <linux/debug_locks.h>
* We want to turn all lock-debugging facilities on/off at once,
* via a global flag. The reason is that once a single bug has been
* detected and reported, there might be cascade of followup bugs
* that would just muddy the log. So we report the first one and
* shut up after that.
int debug_locks = 1;
* The locking-testsuite uses <debug_locks_silent> to get a
* 'silent failure': nothing is printed to the console when
* a locking bug is detected.
int debug_locks_silent;
* Generic 'turn off all lock debugging' function:
int debug_locks_off(void)
if (__debug_locks_off()) {
if (!debug_locks_silent) {
return 1;
return 0;
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