Branch data     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);