ICE_PF_FLAGS_NBITS
DECLARE_BITMAP(flags, ICE_PF_FLAGS_NBITS);
DECLARE_BITMAP(change_flags, ICE_PF_FLAGS_NBITS);
DECLARE_BITMAP(orig_flags, ICE_PF_FLAGS_NBITS);
bitmap_copy(orig_flags, pf->flags, ICE_PF_FLAGS_NBITS);
bitmap_xor(change_flags, pf->flags, orig_flags, ICE_PF_FLAGS_NBITS);