CONFIG_CPU_PXA910 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

CONFIG_CPU_PXA910 (not configurable)

modulename: pxa910.ko

configname: CONFIG_CPU_PXA910

Linux Kernel Configuration
└─>CPU_PXA910
In linux kernel since version 2.6.30 (release Date: 2009-06-09)  
Select code specific to PXA910

source code: