Line data    Source code

       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/rwsem.h>
      12             : #include <linux/mutex.h>
      13             : #include <linux/export.h>
      14             : #include <linux/spinlock.h>
      15             : #include <linux/debug_locks.h>
      16             : 
      17             : /*
      18             :  * We want to turn all lock-debugging facilities on/off at once,
      19             :  * via a global flag. The reason is that once a single bug has been
      20             :  * detected and reported, there might be cascade of followup bugs
      21             :  * that would just muddy the log. So we report the first one and
      22             :  * shut up after that.
      23             :  */
      24             : int debug_locks = 1;
      25             : EXPORT_SYMBOL_GPL(debug_locks);
      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             : EXPORT_SYMBOL_GPL(debug_locks_silent);
      34             : 
      35             : /*
      36             :  * Generic 'turn off all lock debugging' function:
      37             :  */
      38           0 : int debug_locks_off(void)
      39             : {
      40           0 :         if (__debug_locks_off()) {
      41           0 :                 if (!debug_locks_silent) {
      42             :                         console_verbose();
      43             :                         return 1;
      44             :                 }
      45             :         }
      46             :         return 0;
      47             : }
      48             : EXPORT_SYMBOL_GPL(debug_locks_off);