/* * 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 <mingo@redhat.com> */#include <linux/rwsem.h>#include <linux/mutex.h>#include <linux/module.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 (xchg(&debug_locks, 0)) {		if (!debug_locks_silent) {			console_verbose();			return 1;		}	}	return 0;}