bit
unsigned long bit:6; /* Bit number */
#define bit(n) (((unsigned char)1)<<(n))
#define bit(n) (((unsigned char)1)<<(n))
static int bit(u32 rw, int bit)
#define bit(n) ((u64)1 << n)
#define bit(n) (1ULL << (n))
#define bit(b) (1 << (b))