CONFIG_MACH_ARMLEX4210 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
ARMLEX4210
modulename: mach-armlex4210.ko
configname: CONFIG_MACH_ARMLEX4210
Linux Kernel Configuration
└─>SAMSUNG EXYNOS SoCs Support
└─>ARMLEX4210
In linux kernel since version 2.6.39 (release Date: 2011-05-18)
Machine support for Samsung ARMLEX4210 based on EXYNOS4210