1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 29a11b49aSIngo Molnar /* 39a11b49aSIngo Molnar * lib/debug_locks.c 49a11b49aSIngo Molnar * 59a11b49aSIngo Molnar * Generic place for common debugging facilities for various locks: 69a11b49aSIngo Molnar * spinlocks, rwlocks, mutexes and rwsems. 79a11b49aSIngo Molnar * 89a11b49aSIngo Molnar * Started by Ingo Molnar: 99a11b49aSIngo Molnar * 109a11b49aSIngo Molnar * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> 119a11b49aSIngo Molnar */ 129a11b49aSIngo Molnar #include <linux/rwsem.h> 139a11b49aSIngo Molnar #include <linux/mutex.h> 148bc3bcc9SPaul Gortmaker #include <linux/export.h> 159a11b49aSIngo Molnar #include <linux/spinlock.h> 169a11b49aSIngo Molnar #include <linux/debug_locks.h> 179a11b49aSIngo Molnar 189a11b49aSIngo Molnar /* 199a11b49aSIngo Molnar * We want to turn all lock-debugging facilities on/off at once, 209a11b49aSIngo Molnar * via a global flag. The reason is that once a single bug has been 219a11b49aSIngo Molnar * detected and reported, there might be cascade of followup bugs 229a11b49aSIngo Molnar * that would just muddy the log. So we report the first one and 239a11b49aSIngo Molnar * shut up after that. 249a11b49aSIngo Molnar */ 2501a14bdaSWaiman Long int debug_locks __read_mostly = 1; 26632ee200SPaul E. McKenney EXPORT_SYMBOL_GPL(debug_locks); 279a11b49aSIngo Molnar 289a11b49aSIngo Molnar /* 299a11b49aSIngo Molnar * The locking-testsuite uses <debug_locks_silent> to get a 309a11b49aSIngo Molnar * 'silent failure': nothing is printed to the console when 319a11b49aSIngo Molnar * a locking bug is detected. 329a11b49aSIngo Molnar */ 3301a14bdaSWaiman Long int debug_locks_silent __read_mostly; 34040a0a37SMaarten Lankhorst EXPORT_SYMBOL_GPL(debug_locks_silent); 359a11b49aSIngo Molnar 369a11b49aSIngo Molnar /* 379a11b49aSIngo Molnar * Generic 'turn off all lock debugging' function: 389a11b49aSIngo Molnar */ debug_locks_off(void)39*49faa777SPeter Zijlstraint debug_locks_off(void) 409a11b49aSIngo Molnar { 419506a742SWaiman Long if (debug_locks && __debug_locks_off()) { 429a11b49aSIngo Molnar if (!debug_locks_silent) { 439a11b49aSIngo Molnar console_verbose(); 449a11b49aSIngo Molnar return 1; 459a11b49aSIngo Molnar } 469a11b49aSIngo Molnar } 479a11b49aSIngo Molnar return 0; 489a11b49aSIngo Molnar } 49040a0a37SMaarten Lankhorst EXPORT_SYMBOL_GPL(debug_locks_off); 50