CONFIG_MACH_PALM27X is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_MACH_PALM27X (not configurable)

modulename: palm27x.ko

configname: CONFIG_MACH_PALM27X

Linux Kernel Configuration
└─>Intel PXA2xx/PXA3xx Implementations
└─>MACH_PALM27X
In linux kernel since version 2.6.36 (release Date: 2010-10-20)  
source code:
arch/arm/mach-pxa/palm27x.c
depends
CONFIG_ARCH_PXA |
| CONFIG_ATAGS