Not building a module won't make the build process complain -- it'll just assume you didn't want it. What does 'grep -A10 Fusion .config' say?
OK i see
grep -A10 Fusion .config # Fusion MPT device support # CONFIG_FUSION=y CONFIG_FUSION_SPI=y CONFIG_FUSION_FC=y CONFIG_FUSION_SAS=m CONFIG_FUSION_MAX_SGE=128 CONFIG_FUSION_CTL=y
# # IEEE 1394 (FireWire) support