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        preempt_disable();
        spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
        LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
}
EXPORT_SYMBOL(_spin_lock_nested);

unsigned long __lockfunc _spin_lock_irqsave_nested(spinlock_t *lock, int subclass)
{
        unsigned long flags;

        local_irq_save(flags);
        preempt_disable();
        spin_acquire(&lock->dep_map, subclass, 0, _RET_IP_);
        /*
         * On lockdep we dont want the hand-coded irq-enable of
         * _raw_spin_lock_flags() code, because lockdep assumes
         * that interrupts are not re-enabled during lock-acquire:
         */
#ifdef CONFIG_LOCKDEP
        LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
#else
        _raw_spin_lock_flags(lock, &flags);
#endif
        return flags;
}
EXPORT_SYMBOL(_spin_lock_irqsave_nested);

void __lockfunc _spin_lock_nest_lock(spinlock_t *lock,
                                     struct lockdep_map *nest_lock)
{
        preempt_disable();
        spin_acquire_nest(&lock->dep_map, 0, 0, nest_lock, _RET_IP_);
        LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);
}
EXPORT_SYMBOL(_spin_lock_nest_lock);

#endif

void __lockfunc _spin_unlock(spinlock_t *lock)
{
        spin_release(&lock->dep_map, 1, _RET_IP_);