BITS_TO_LONGS
#define BITS_TO_LONGS(n) howmany((n), BITS_PER_LONG)
#define BITS_TO_LONGS(n) howmany((n), BITS_PER_LONG)
#define BITS_TO_LONGS(x) howmany(x, NB_BITS_PER_LONG)
#define BITS_TO_LONGS(n) howmany((n), BITS_PER_LONG)