mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 05:32:00 +00:00
408894ee4d
mutex implementation - add debugging code. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@infradead.org>
135 lines
3.4 KiB
C
135 lines
3.4 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.
|
|
*/
|
|
|
|
extern spinlock_t debug_mutex_lock;
|
|
extern struct list_head debug_mutex_held_locks;
|
|
extern int debug_mutex_on;
|
|
|
|
/*
|
|
* 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 __IP_DECL__ , unsigned long ip
|
|
#define __IP__ , ip
|
|
#define __RET_IP__ , (unsigned long)__builtin_return_address(0)
|
|
|
|
/*
|
|
* This must be called with lock->wait_lock held.
|
|
*/
|
|
extern void debug_mutex_set_owner(struct mutex *lock,
|
|
struct thread_info *new_owner __IP_DECL__);
|
|
|
|
static inline void debug_mutex_clear_owner(struct mutex *lock)
|
|
{
|
|
lock->owner = NULL;
|
|
}
|
|
|
|
extern void debug_mutex_init_waiter(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 __IP_DECL__);
|
|
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);
|
|
|
|
#define debug_spin_lock(lock) \
|
|
do { \
|
|
local_irq_disable(); \
|
|
if (debug_mutex_on) \
|
|
spin_lock(lock); \
|
|
} while (0)
|
|
|
|
#define debug_spin_unlock(lock) \
|
|
do { \
|
|
if (debug_mutex_on) \
|
|
spin_unlock(lock); \
|
|
local_irq_enable(); \
|
|
preempt_check_resched(); \
|
|
} while (0)
|
|
|
|
#define debug_spin_lock_save(lock, flags) \
|
|
do { \
|
|
local_irq_save(flags); \
|
|
if (debug_mutex_on) \
|
|
spin_lock(lock); \
|
|
} while (0)
|
|
|
|
#define debug_spin_lock_restore(lock, flags) \
|
|
do { \
|
|
if (debug_mutex_on) \
|
|
spin_unlock(lock); \
|
|
local_irq_restore(flags); \
|
|
preempt_check_resched(); \
|
|
} while (0)
|
|
|
|
#define spin_lock_mutex(lock) \
|
|
do { \
|
|
struct mutex *l = container_of(lock, struct mutex, wait_lock); \
|
|
\
|
|
DEBUG_WARN_ON(in_interrupt()); \
|
|
debug_spin_lock(&debug_mutex_lock); \
|
|
spin_lock(lock); \
|
|
DEBUG_WARN_ON(l->magic != l); \
|
|
} while (0)
|
|
|
|
#define spin_unlock_mutex(lock) \
|
|
do { \
|
|
spin_unlock(lock); \
|
|
debug_spin_unlock(&debug_mutex_lock); \
|
|
} while (0)
|
|
|
|
#define DEBUG_OFF() \
|
|
do { \
|
|
if (debug_mutex_on) { \
|
|
debug_mutex_on = 0; \
|
|
console_verbose(); \
|
|
if (spin_is_locked(&debug_mutex_lock)) \
|
|
spin_unlock(&debug_mutex_lock); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define DEBUG_BUG() \
|
|
do { \
|
|
if (debug_mutex_on) { \
|
|
DEBUG_OFF(); \
|
|
BUG(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define DEBUG_WARN_ON(c) \
|
|
do { \
|
|
if (unlikely(c && debug_mutex_on)) { \
|
|
DEBUG_OFF(); \
|
|
WARN_ON(1); \
|
|
} \
|
|
} while (0)
|
|
|
|
# define DEBUG_BUG_ON(c) \
|
|
do { \
|
|
if (unlikely(c)) \
|
|
DEBUG_BUG(); \
|
|
} while (0)
|
|
|
|
#ifdef CONFIG_SMP
|
|
# define SMP_DEBUG_WARN_ON(c) DEBUG_WARN_ON(c)
|
|
# define SMP_DEBUG_BUG_ON(c) DEBUG_BUG_ON(c)
|
|
#else
|
|
# define SMP_DEBUG_WARN_ON(c) do { } while (0)
|
|
# define SMP_DEBUG_BUG_ON(c) do { } while (0)
|
|
#endif
|
|
|