CONFIG_MACH_BALLOON3 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Balloon 3 board

modulename: balloon3.ko

configname: CONFIG_MACH_BALLOON3

Linux Kernel Configuration
└─>PXA2xx/PXA3xx-based
└─>Intel PXA2xx/PXA3xx Implementations
└─>Balloon 3 board
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
source code:
/arch/arm/mach-pxa/


is selected by
CONFIG_PCMCIA_PXA2XX