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Linux/lib/debug_locks.c

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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 noinstr int debug_locks_off(void)
 40 {
 41         if (debug_locks && __debug_locks_off()) {
 42                 if (!debug_locks_silent) {
 43                         console_verbose();
 44                         return 1;
 45                 }
 46         }
 47         return 0;
 48 }
 49 EXPORT_SYMBOL_GPL(debug_locks_off);
 50 

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