ip_fast_csum_nofold 150 arch/powerpc/include/asm/checksum.h return csum_fold(ip_fast_csum_nofold(iph, ihl)); ip_fast_csum_nofold 193 arch/powerpc/include/asm/checksum.h sum = csum_add(sum, ip_fast_csum_nofold(buff, len >> 2));