CONFIG_MACH_PALMZ72 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

Palm Zire 72

modulename: palmz72.ko

configname: CONFIG_MACH_PALMZ72

Linux Kernel Configuration
└─>PXA2xx/PXA3xx-based
└─>Intel PXA2xx/PXA3xx Implementations
└─>Palm Zire 72
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
Say Y here if you intend to run this kernel on Palm Zire 72
handheld computer.

source code: