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Linux/lib/debug_locks.c

  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 int debug_locks_off(void)
 39 {
 40         if (__debug_locks_off()) {
 41                 if (!debug_locks_silent) {
 42                         console_verbose();
 43                         return 1;
 44                 }
 45         }
 46         return 0;
 47 }
 48 EXPORT_SYMBOL_GPL(debug_locks_off);
 49 

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