Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * lib/debug_locks.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Generic place for common debugging facilities for various locks:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * spinlocks, rwlocks, mutexes and rwsems.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Started by Ingo Molnar:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/rwsem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/debug_locks.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * We want to turn all lock-debugging facilities on/off at once,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * via a global flag. The reason is that once a single bug has been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * detected and reported, there might be cascade of followup bugs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * that would just muddy the log. So we report the first one and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * shut up after that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int debug_locks __read_mostly = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) EXPORT_SYMBOL_GPL(debug_locks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * The locking-testsuite uses <debug_locks_silent> to get a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  * 'silent failure': nothing is printed to the console when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  * a locking bug is detected.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int debug_locks_silent __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) EXPORT_SYMBOL_GPL(debug_locks_silent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  * Generic 'turn off all lock debugging' function:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) int debug_locks_off(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	if (debug_locks && __debug_locks_off() && !debug_locks_silent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) EXPORT_SYMBOL_GPL(debug_locks_off);