_atomic_dec_and_lock_irqsave
extern int _atomic_dec_and_lock_irqsave(atomic_t *atomic, spinlock_t *lock,
#define atomic_dec_and_lock_irqsave(atomic, lock, flags) _atomic_dec_and_lock_irqsave(atomic, lock, &(flags))
EXPORT_SYMBOL(_atomic_dec_and_lock_irqsave);