mutex-debug.h

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/*
 * Mutexes: blocking mutual exclusion locks
 *
 * started by Ingo Molnar:
 *
 *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <[email protected]>
 *
 * 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_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);

static inline void mutex_set_owner(struct mutex *lock)
{
    lock->owner = current;
}

static inline void mutex_clear_owner(struct mutex *lock)
{
    lock->owner = NULL;
}

#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);          \
        arch_spin_lock(&(lock)->rlock.raw_lock);\
        DEBUG_LOCKS_WARN_ON(l->magic != l); \
    } while (0)

#define spin_unlock_mutex(lock, flags)              \
    do {                            \
        arch_spin_unlock(&(lock)->rlock.raw_lock);  \
        local_irq_restore(flags);           \
        preempt_check_resched();            \
    } while (0)