mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-15 13:22:55 +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>
54 lines
1.7 KiB
C
54 lines
1.7 KiB
C
/*
|
|
* Mutexes: blocking mutual exclusion locks
|
|
*
|
|
* started by Ingo Molnar:
|
|
*
|
|
* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*
|
|
* This file contains mutex debugging related internal declarations,
|
|
* prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
|
|
* More details are in kernel/mutex-debug.c.
|
|
*/
|
|
|
|
/*
|
|
* This must be called with lock->wait_lock held.
|
|
*/
|
|
extern void
|
|
debug_mutex_set_owner(struct mutex *lock, struct thread_info *new_owner);
|
|
|
|
static inline void debug_mutex_clear_owner(struct mutex *lock)
|
|
{
|
|
lock->owner = NULL;
|
|
}
|
|
|
|
extern void debug_mutex_lock_common(struct mutex *lock,
|
|
struct mutex_waiter *waiter);
|
|
extern void debug_mutex_wake_waiter(struct mutex *lock,
|
|
struct mutex_waiter *waiter);
|
|
extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
|
|
extern void debug_mutex_add_waiter(struct mutex *lock,
|
|
struct mutex_waiter *waiter,
|
|
struct thread_info *ti);
|
|
extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
|
|
struct thread_info *ti);
|
|
extern void debug_mutex_unlock(struct mutex *lock);
|
|
extern void debug_mutex_init(struct mutex *lock, const char *name,
|
|
struct lock_class_key *key);
|
|
|
|
#define spin_lock_mutex(lock, flags) \
|
|
do { \
|
|
struct mutex *l = container_of(lock, struct mutex, wait_lock); \
|
|
\
|
|
DEBUG_LOCKS_WARN_ON(in_interrupt()); \
|
|
local_irq_save(flags); \
|
|
__raw_spin_lock(&(lock)->raw_lock); \
|
|
DEBUG_LOCKS_WARN_ON(l->magic != l); \
|
|
} while (0)
|
|
|
|
#define spin_unlock_mutex(lock, flags) \
|
|
do { \
|
|
__raw_spin_unlock(&(lock)->raw_lock); \
|
|
local_irq_restore(flags); \
|
|
preempt_check_resched(); \
|
|
} while (0)
|