NFT_PIPAPO_MAP_NBITS
#define NFT_PIPAPO_MAP_TOBITS (BITS_PER_LONG - NFT_PIPAPO_MAP_NBITS)
- (1UL << NFT_PIPAPO_MAP_NBITS))
static_assert(NFT_PIPAPO_MAP_NBITS <= 32);
unsigned long n:NFT_PIPAPO_MAP_NBITS;