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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 : 0 : int debug_locks_off(void) 40 : : { 41 [ # # # # ]: 0 : if (debug_locks && __debug_locks_off()) { 42 [ # # ]: 0 : if (!debug_locks_silent) { 43 [ # # ]: 0 : console_verbose(); 44 : 0 : return 1; 45 : : } 46 : : } 47 : : return 0; 48 : : } 49 : : EXPORT_SYMBOL_GPL(debug_locks_off);