data[n] |= (1 << off);
buffer[n] |= (1 << off);
static inline void ubd_set_bit(__u64 bit, unsigned char *data){	__u64 n;	int bits, off;	bits = sizeof(data[0]) * 8;	n = bit / bits;	off = bit % bits;	data[n] |= (1 << off);}