System :: about zlib_inflate

i use dsl2.2, the kernel is 2.4.26.i want compile the zlib compression support into kernel.so i chose the zlib compression support and decompression support items as (*),but after it compilered ,i can't find the zlib_inflate signs in sytem.map .So i use modprobe zlib_inflate(i also compile those in modules ) before insmod cloop.o.
it's troublesome.. how do i compile the zlib_inflate into kernel.

original here.