extern inline void _raw_spin_unlock(spinlock_t *lp)
static inline void _raw_spin_unlock(spinlock_t *lp)
extern inline void _raw_spin_unlock(spinlock_t *lp){	unsigned int old;	__asm__ __volatile__("cs %0,%3,0(%4)"			   : "=d" (old), "=m" (lp->lock)			   : "0" (lp->lock), "d" (0), "a" (lp)			   : "cc", "memory" );}