[linux.git] / lib / debug_locks.c

/*
 * 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 <[email protected]>
 */
#include <linux/kernel.h>
#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) {
			oops_in_progress = 1;
			console_verbose();
			return 1;
		}
	}
	return 0;
}
Commit	Line	Data
9a11b49a IM	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 <[email protected]>
	10	*/
e0fdace1	11	#include <linux/kernel.h>
9a11b49a IM	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	*/
	25	int debug_locks = 1;
	26
	27	/*
	28	* The locking-testsuite uses <debug_locks_silent> to get a
	29	* 'silent failure': nothing is printed to the console when
	30	* a locking bug is detected.
	31	*/
	32	int debug_locks_silent;
	33
	34	/*
	35	* Generic 'turn off all lock debugging' function:
	36	*/
	37	int debug_locks_off(void)
	38	{
	39	if (xchg(&debug_locks, 0)) {
	40	if (!debug_locks_silent) {
e0fdace1	41	oops_in_progress = 1;
9a11b49a IM	42	console_verbose();
	43	return 1;
	44	}
	45	}
	46	return 0;
	47	}