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 <mingo@redhat.com> 10 */ 11 #include <linux/kernel.h> 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 */ debug_locks_off(void)37int debug_locks_off(void) 38 { 39 if (xchg(&debug_locks, 0)) { 40 if (!debug_locks_silent) { 41 oops_in_progress = 1; 42 console_verbose(); 43 return 1; 44 } 45 } 46 return 0; 47 } 48