CONFIG_PPC_CELL_QPACE is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

IBM Cell - QPACE

modulename: smp.ko

and/or

qpace_setup.ko

configname: CONFIG_PPC_CELL_QPACE

Linux Kernel Configuration
└─>IBM Cell - QPACE
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
source code:
arch/powerpc/platforms/cell/smp.c