mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 16:38:31 +00:00
9a11b49a80
Generic lock debugging:
- generalized lock debugging framework. For example, a bug in one lock
subsystem turns off debugging in all lock subsystems.
- got rid of the caller address passing (__IP__/__IP_DECL__/etc.) from
the mutex/rtmutex debugging code: it caused way too much prototype
hackery, and lockdep will give the same information anyway.
- ability to do silent tests
- check lock freeing in vfree too.
- more finegrained debugging options, to allow distributions to
turn off more expensive debugging features.
There's no separate 'held mutexes' list anymore - but there's a 'held locks'
stack within lockdep, which unifies deadlock detection across all lock
classes. (this is independent of the lockdep validation stuff - lockdep first
checks whether we are holding a lock already)
Here are the current debugging options:
CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_LOCK_ALLOC=y
which do:
config DEBUG_MUTEXES
bool "Mutex debugging, basic checks"
config DEBUG_LOCK_ALLOC
bool "Detect incorrect freeing of live mutexes"
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*
|
|
* lib/debug_locks.c
|
|
*
|
|
* Generic place for common debugging facilities for various locks:
|
|
* spinlocks, rwlocks, mutexes and rwsems.
|
|
*
|
|
* Started by Ingo Molnar:
|
|
*
|
|
* Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
#include <linux/rwsem.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/module.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/debug_locks.h>
|
|
|
|
/*
|
|
* We want to turn all lock-debugging facilities on/off at once,
|
|
* via a global flag. The reason is that once a single bug has been
|
|
* detected and reported, there might be cascade of followup bugs
|
|
* that would just muddy the log. So we report the first one and
|
|
* shut up after that.
|
|
*/
|
|
int debug_locks = 1;
|
|
|
|
/*
|
|
* The locking-testsuite uses <debug_locks_silent> to get a
|
|
* 'silent failure': nothing is printed to the console when
|
|
* a locking bug is detected.
|
|
*/
|
|
int debug_locks_silent;
|
|
|
|
/*
|
|
* Generic 'turn off all lock debugging' function:
|
|
*/
|
|
int debug_locks_off(void)
|
|
{
|
|
if (xchg(&debug_locks, 0)) {
|
|
if (!debug_locks_silent) {
|
|
console_verbose();
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|