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
/*
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* Mutexes: blocking mutual exclusion locks
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*
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* started by Ingo Molnar:
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*
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* Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
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*
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* This file contains mutex debugging related internal declarations,
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* prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
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* More details are in kernel/mutex-debug.c.
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*/
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extern spinlock_t debug_mutex_lock;
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extern struct list_head debug_mutex_held_locks;
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extern int debug_mutex_on;
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/*
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* In the debug case we carry the caller's instruction pointer into
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* other functions, but we dont want the function argument overhead
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* in the nondebug case - hence these macros:
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*/
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#define __IP_DECL__ , unsigned long ip
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#define __IP__ , ip
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#define __RET_IP__ , (unsigned long)__builtin_return_address(0)
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/*
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* This must be called with lock->wait_lock held.
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*/
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extern void debug_mutex_set_owner(struct mutex *lock,
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struct thread_info *new_owner __IP_DECL__);
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static inline void debug_mutex_clear_owner(struct mutex *lock)
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{
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lock->owner = NULL;
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}
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extern void debug_mutex_init_waiter(struct mutex_waiter *waiter);
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extern void debug_mutex_wake_waiter(struct mutex *lock,
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struct mutex_waiter *waiter);
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extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
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extern void debug_mutex_add_waiter(struct mutex *lock,
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struct mutex_waiter *waiter,
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struct thread_info *ti __IP_DECL__);
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extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
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struct thread_info *ti);
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extern void debug_mutex_unlock(struct mutex *lock);
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extern void debug_mutex_init(struct mutex *lock, const char *name);
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#define debug_spin_lock(lock) \
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do { \
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local_irq_disable(); \
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if (debug_mutex_on) \
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spin_lock(lock); \
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} while (0)
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#define debug_spin_unlock(lock) \
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do { \
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if (debug_mutex_on) \
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spin_unlock(lock); \
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local_irq_enable(); \
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preempt_check_resched(); \
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} while (0)
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#define debug_spin_lock_save(lock, flags) \
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do { \
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local_irq_save(flags); \
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if (debug_mutex_on) \
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spin_lock(lock); \
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} while (0)
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#define debug_spin_lock_restore(lock, flags) \
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do { \
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if (debug_mutex_on) \
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spin_unlock(lock); \
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local_irq_restore(flags); \
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preempt_check_resched(); \
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} while (0)
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#define spin_lock_mutex(lock) \
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do { \
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struct mutex *l = container_of(lock, struct mutex, wait_lock); \
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\
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DEBUG_WARN_ON(in_interrupt()); \
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debug_spin_lock(&debug_mutex_lock); \
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spin_lock(lock); \
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DEBUG_WARN_ON(l->magic != l); \
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} while (0)
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#define spin_unlock_mutex(lock) \
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do { \
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spin_unlock(lock); \
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debug_spin_unlock(&debug_mutex_lock); \
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} while (0)
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#define DEBUG_OFF() \
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do { \
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if (debug_mutex_on) { \
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debug_mutex_on = 0; \
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console_verbose(); \
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if (spin_is_locked(&debug_mutex_lock)) \
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spin_unlock(&debug_mutex_lock); \
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} \
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} while (0)
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#define DEBUG_BUG() \
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do { \
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if (debug_mutex_on) { \
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DEBUG_OFF(); \
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BUG(); \
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} \
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} while (0)
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#define DEBUG_WARN_ON(c) \
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do { \
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if (unlikely(c && debug_mutex_on)) { \
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DEBUG_OFF(); \
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WARN_ON(1); \
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} \
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} while (0)
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# define DEBUG_BUG_ON(c) \
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do { \
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if (unlikely(c)) \
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DEBUG_BUG(); \
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} while (0)
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#ifdef CONFIG_SMP
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# define SMP_DEBUG_WARN_ON(c) DEBUG_WARN_ON(c)
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# define SMP_DEBUG_BUG_ON(c) DEBUG_BUG_ON(c)
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#else
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# define SMP_DEBUG_WARN_ON(c) do { } while (0)
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# define SMP_DEBUG_BUG_ON(c) do { } while (0)
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#endif
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