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>
69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#ifndef __LINUX_DEBUG_LOCKING_H
|
|
#define __LINUX_DEBUG_LOCKING_H
|
|
|
|
extern int debug_locks;
|
|
extern int debug_locks_silent;
|
|
|
|
/*
|
|
* Generic 'turn off all lock debugging' function:
|
|
*/
|
|
extern int debug_locks_off(void);
|
|
|
|
/*
|
|
* In the debug case we carry the caller's instruction pointer into
|
|
* other functions, but we dont want the function argument overhead
|
|
* in the nondebug case - hence these macros:
|
|
*/
|
|
#define _RET_IP_ (unsigned long)__builtin_return_address(0)
|
|
#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })
|
|
|
|
#define DEBUG_LOCKS_WARN_ON(c) \
|
|
({ \
|
|
int __ret = 0; \
|
|
\
|
|
if (unlikely(c)) { \
|
|
if (debug_locks_off()) \
|
|
WARN_ON(1); \
|
|
__ret = 1; \
|
|
} \
|
|
__ret; \
|
|
})
|
|
|
|
#ifdef CONFIG_SMP
|
|
# define SMP_DEBUG_LOCKS_WARN_ON(c) DEBUG_LOCKS_WARN_ON(c)
|
|
#else
|
|
# define SMP_DEBUG_LOCKS_WARN_ON(c) do { } while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
|
|
extern void locking_selftest(void);
|
|
#else
|
|
# define locking_selftest() do { } while (0)
|
|
#endif
|
|
|
|
#ifdef CONFIG_LOCKDEP
|
|
extern void debug_show_all_locks(void);
|
|
extern void debug_show_held_locks(struct task_struct *task);
|
|
extern void debug_check_no_locks_freed(const void *from, unsigned long len);
|
|
extern void debug_check_no_locks_held(struct task_struct *task);
|
|
#else
|
|
static inline void debug_show_all_locks(void)
|
|
{
|
|
}
|
|
|
|
static inline void debug_show_held_locks(struct task_struct *task)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
debug_check_no_locks_freed(const void *from, unsigned long len)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
debug_check_no_locks_held(struct task_struct *task)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif
|