mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 16:07:39 +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>
33 lines
1.4 KiB
C
33 lines
1.4 KiB
C
/*
|
|
* RT-Mutexes: blocking mutual exclusion locks with PI support
|
|
*
|
|
* started by Ingo Molnar and Thomas Gleixner:
|
|
*
|
|
* Copyright (C) 2004-2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
* Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
|
|
*
|
|
* This file contains macros used solely by rtmutex.c. Debug version.
|
|
*/
|
|
|
|
extern void
|
|
rt_mutex_deadlock_account_lock(struct rt_mutex *lock, struct task_struct *task);
|
|
extern void rt_mutex_deadlock_account_unlock(struct task_struct *task);
|
|
extern void debug_rt_mutex_init_waiter(struct rt_mutex_waiter *waiter);
|
|
extern void debug_rt_mutex_free_waiter(struct rt_mutex_waiter *waiter);
|
|
extern void debug_rt_mutex_init(struct rt_mutex *lock, const char *name);
|
|
extern void debug_rt_mutex_lock(struct rt_mutex *lock);
|
|
extern void debug_rt_mutex_unlock(struct rt_mutex *lock);
|
|
extern void debug_rt_mutex_proxy_lock(struct rt_mutex *lock,
|
|
struct task_struct *powner);
|
|
extern void debug_rt_mutex_proxy_unlock(struct rt_mutex *lock);
|
|
extern void debug_rt_mutex_deadlock(int detect, struct rt_mutex_waiter *waiter,
|
|
struct rt_mutex *lock);
|
|
extern void debug_rt_mutex_print_deadlock(struct rt_mutex_waiter *waiter);
|
|
# define debug_rt_mutex_reset_waiter(w) \
|
|
do { (w)->deadlock_lock = NULL; } while (0)
|
|
|
|
static inline int debug_rt_mutex_detect_deadlock(struct rt_mutex_waiter *waiter,
|
|
int detect)
|
|
{
|
|
return (waiter != NULL);
|
|
}
|