1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * lib/debug_locks.c 4 * 5 * Generic place for common debugging facilities for various locks: 6 * spinlocks, rwlocks, mutexes and rwsems. 7 * 8 * Started by Ingo Molnar: 9 * 10 * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> 11 */ 12 #include <linux/rwsem.h> 13 #include <linux/mutex.h> 14 #include <linux/export.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 __read_mostly = 1; 26 EXPORT_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 */ 33 int debug_locks_silent __read_mostly; 34 EXPORT_SYMBOL_GPL(debug_locks_silent); 35 36 /* 37 * Generic 'turn off all lock debugging' function: 38 */ 39 noinstr int debug_locks_off(void) 40 { 41 if (debug_locks && __debug_locks_off()) { 42 if (!debug_locks_silent) { 43 console_verbose(); 44 return 1; 45 } 46 } 47 return 0; 48 } 49 EXPORT_SYMBOL_GPL(debug_locks_off); 50